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high 7.8

CVE-2026-23243 json

RDMA/umad: Reject negative data_len in ib_umad_write

published 7mo ago modified 21d ago also EUVD-2026-12804

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

In the Linux kernel, the following vulnerability has been resolved:

RDMA/umad: Reject negative data_len in ib_umad_write

ib_umad_write computes data_len from user-controlled count and the MAD header sizes. With a mismatched user MAD header size and RMPP header length, data_len can become negative and reach ib_create_send_mad(). This can make the padding calculation exceed the segment size and trigger an out-of-bounds memset in alloc_send_rmpp_list().

Add an explicit check to reject negative data_len before creating the send buffer.

KASAN splat: [ 211.363464] BUG: KASAN: slab-out-of-bounds in ib_create_send_mad+0xa01/0x11b0 [ 211.364077] Write of size 220 at addr ffff88800c3fa1f8 by task spray_thread/102 [ 211.365867] ib_create_send_mad+0xa01/0x11b0 [ 211.365887] ib_umad_write+0x853/0x1c80

Patch / fix

  • Linux Linux 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4, 7.0
  • linux Debian 12 6.1.170-1
  • linux Debian 13 6.12.85-1
  • linux Debian 14 6.18.14-1

debian advisories DEBIAN-CVE-2026-23243

  • linux Ubuntu 22.04 LTS 5.15.0-186.196
  • linux Ubuntu 24.04 LTS 6.8.0-134.134
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1112.119
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1060.63
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1112.122
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1063.69
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1108.114
  • linux-gke Ubuntu 24.04 LTS 6.8.0-1058.64

ubuntu advisories UBUNTU-CVE-2026-23243

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel-rt RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-kvm RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-core RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-modules RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-debug-kvm RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-debug-core RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-debug-modules RHEL 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel-rt-modules-extra RHEL 8 4.18.0-553.126.1.rt7.467.el8_10

red hat advisories RHSA-2026:41236RHSA-2026:27729RHSA-2026:26570RHSA-2026:26535RHSA-2026:21745RHSA-2026:21706

  • kernel-livepatch-SLE16_Update_5 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6-160000.1.1
  • kernel-livepatch-SLE16_Update_0 SLES for SAP applications 16.0, SLES 16.0 13-160000.4.3
  • kernel-livepatch-SLE16_Update_2 SLES for SAP applications 16.0, SLES 16.0 9-160000.1.1
  • kernel-livepatch-SLE16_Update_6 SLES for SAP applications 16.0, SLES 16.0 5-160000.1.1
  • kernel-livepatch-SLE16_Update_4 SLES for SAP applications 16.0, SLES 16.0 7-160000.1.1
  • kernel-livepatch-SLE16_Update_1 SLES for SAP applications 16.0, SLES 16.0 11-160000.1.1
  • kernel-livepatch-SLE16_Update_3 SLES for SAP applications 16.0, SLES 16.0 8-160000.1.1
  • kernel-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.144.1

suse advisories SUSE-SU-2026:22040-1SUSE-SU-2026:22042-1SUSE-SU-2026:22039-1SUSE-SU-2026:22038-1SUSE-SU-2026:22035-1SUSE-SU-2026:22033-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.28.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.28.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.28.1

opensuse advisories openSUSE-SU-2026:20572-1

  • kernel AlmaLinux 8 4.18.0-553.126.1.el8_10
  • perf AlmaLinux 8 4.18.0-553.126.1.el8_10
  • bpftool AlmaLinux 8 4.18.0-553.126.1.el8_10
  • kernel-core AlmaLinux 8 4.18.0-553.126.1.el8_10
  • kernel-tools AlmaLinux 8 4.18.0-553.126.1.el8_10
  • python3-perf AlmaLinux 8 4.18.0-553.126.1.el8_10
  • kernel-modules AlmaLinux 8 4.18.0-553.126.1.el8_10
  • kernel-zfcpdump AlmaLinux 8 4.18.0-553.126.1.el8_10

almalinux advisories ALSA-2026:21706ALSA-2026:21745ALSA-2026:18134ALSA-2026:18587

  • kernel-rt Rocky Linux 8 4.18.0-553.126.1.rt7.467.el8_10
  • kernel Rocky Linux 8 4.18.0-553.126.1.el8_10

rocky linux advisories RLSA-2026:21745RLSA-2026:21706

  • kernel Azure Linux 3.0 6.6.130.1-1

azure linux advisories AZL-80004

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Is CVE-2026-23243 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-23243 updated cvss 7.3

kernel: Linux kernel: Denial of service and memory corruption in RDMA umad

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: workaround, no fix planned “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat Enterprise Linux 9 kernel-rt, kernel-rt-kvm, kernel-rt-core, kernel-rt-modules, kernel-rt-debug-kvm, kernel-rt-debug-core, +12 more
    affected: workaround, no fix available “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.”
  • Red Hat CodeReady Linux Builder EUS (v.9.4) libperf 5.14.0-427.127.1.el9_4, kernel-debuginfo-common-s390x 5.14.0-427.127.1.el9_4, kernel-debuginfo-common-x86_64 5.14.0-427.127.1.el9_4, kernel-debuginfo-common-aarch64 5.14.0-427.127.1.el9_4, kernel-debuginfo-common-ppc64le 5.14.0-427.127.1.el9_4
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:21209
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.112.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.112.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.112.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.112.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.112.1.el9_6
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:14339
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.5.1.el9_8, perf 5.14.0-687.5.1.el9_8, rtla 5.14.0-687.5.1.el9_8, python3-perf 5.14.0-687.5.1.el9_8, kernel-devel-matched 5.14.0-687.5.1.el9_8, kernel-64k-devel-matched 5.14.0-687.5.1.el9_8, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18587
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.7.1.el10_2, perf 6.12.0-211.7.1.el10_2, rtla 6.12.0-211.7.1.el10_2, python3-perf 6.12.0-211.7.1.el10_2, kernel-devel-matched 6.12.0-211.7.1.el10_2, kernel-64k-devel-matched 6.12.0-211.7.1.el10_2, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18134
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) perf 5.14.0-70.178.1.el9_0, kernel-devel-matched 5.14.0-70.178.1.el9_0, kernel-debug-devel-matched 5.14.0-70.178.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.178.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.178.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.178.1.el9_0, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:13936
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.172.1.el9_2, rtla 5.14.0-284.172.1.el9_2, kernel-devel-matched 5.14.0-284.172.1.el9_2, kernel-64k-devel-matched 5.14.0-284.172.1.el9_2, kernel-debug-devel-matched 5.14.0-284.172.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.172.1.el9_2, +5 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:20593
show 32 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.72.1.el10_0, perf 6.12.0-55.72.1.el10_0, rtla 6.12.0-55.72.1.el10_0, python3-perf 6.12.0-55.72.1.el10_0, kernel-devel-matched 6.12.0-55.72.1.el10_0, kernel-64k-devel-matched 6.12.0-55.72.1.el10_0, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:15883
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) rv 5.14.0-427.127.1.el9_4, perf 5.14.0-427.127.1.el9_4, rtla 5.14.0-427.127.1.el9_4, kernel-devel-matched 5.14.0-427.127.1.el9_4, kernel-64k-devel-matched 5.14.0-427.127.1.el9_4, kernel-debug-devel-matched 5.14.0-427.127.1.el9_4, +6 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:21209
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.112.1.el9_6, perf 5.14.0-570.112.1.el9_6, rtla 5.14.0-570.112.1.el9_6, python3-perf 5.14.0-570.112.1.el9_6, kernel-devel-matched 5.14.0-570.112.1.el9_6, kernel-64k-devel-matched 5.14.0-570.112.1.el9_6, +7 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:14339
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.126.1.el8_10, kernel 4.18.0-553.126.1.el8_10, bpftool 4.18.0-553.126.1.el8_10, kernel-core 4.18.0-553.126.1.el8_10, kernel-tools 4.18.0-553.126.1.el8_10, python3-perf 4.18.0-553.126.1.el8_10, +15 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:21706
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.5.1.el9_8, kernel-64k 5.14.0-687.5.1.el9_8, kernel-core 5.14.0-687.5.1.el9_8, kernel-tools 5.14.0-687.5.1.el9_8, kernel-modules 5.14.0-687.5.1.el9_8, kernel-64k-core 5.14.0-687.5.1.el9_8, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18587
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.7.1.el10_2, kernel-64k 6.12.0-211.7.1.el10_2, kernel-core 6.12.0-211.7.1.el10_2, kernel-tools 6.12.0-211.7.1.el10_2, kernel-modules 6.12.0-211.7.1.el10_2, kernel-64k-core 6.12.0-211.7.1.el10_2, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18134
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.194.1.el8_4, kernel 4.18.0-305.194.1.el8_4, bpftool 4.18.0-305.194.1.el8_4, kernel-core 4.18.0-305.194.1.el8_4, kernel-tools 4.18.0-305.194.1.el8_4, python3-perf 4.18.0-305.194.1.el8_4, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:26535
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.196.1.el8_6, kernel 4.18.0-372.196.1.el8_6, bpftool 4.18.0-372.196.1.el8_6, kernel-core 4.18.0-372.196.1.el8_6, kernel-tools 4.18.0-372.196.1.el8_6, python3-perf 4.18.0-372.196.1.el8_6, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:26570
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.143.1.el8_8, kernel 4.18.0-477.143.1.el8_8, bpftool 4.18.0-477.143.1.el8_8, kernel-core 4.18.0-477.143.1.el8_8, kernel-tools 4.18.0-477.143.1.el8_8, python3-perf 4.18.0-477.143.1.el8_8, +9 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19521
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) kernel 5.14.0-70.178.1.el9_0, bpftool 5.14.0-70.178.1.el9_0, kernel-core 5.14.0-70.178.1.el9_0, kernel-tools 5.14.0-70.178.1.el9_0, python3-perf 5.14.0-70.178.1.el9_0, kernel-modules 5.14.0-70.178.1.el9_0, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:13936
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.172.1.el9_2, kernel 5.14.0-284.172.1.el9_2, kernel-64k 5.14.0-284.172.1.el9_2, kernel-core 5.14.0-284.172.1.el9_2, kernel-tools 5.14.0-284.172.1.el9_2, python3-perf 5.14.0-284.172.1.el9_2, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:20593
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.72.1.el10_0, kernel-64k 6.12.0-55.72.1.el10_0, kernel-core 6.12.0-55.72.1.el10_0, kernel-tools 6.12.0-55.72.1.el10_0, kernel-modules 6.12.0-55.72.1.el10_0, kernel-64k-core 6.12.0-55.72.1.el10_0, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:15883
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) bpftool 7.3.0-427.127.1.el9_4, kernel 5.14.0-427.127.1.el9_4, kernel-64k 5.14.0-427.127.1.el9_4, kernel-core 5.14.0-427.127.1.el9_4, kernel-tools 5.14.0-427.127.1.el9_4, python3-perf 5.14.0-427.127.1.el9_4, +28 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:21209
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.112.1.el9_6, kernel-64k 5.14.0-570.112.1.el9_6, kernel-core 5.14.0-570.112.1.el9_6, kernel-tools 5.14.0-570.112.1.el9_6, kernel-modules 5.14.0-570.112.1.el9_6, kernel-64k-core 5.14.0-570.112.1.el9_6, +27 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:14339
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.194.1.el8_4, kernel 4.18.0-305.194.1.el8_4, bpftool 4.18.0-305.194.1.el8_4, kernel-core 4.18.0-305.194.1.el8_4, kernel-tools 4.18.0-305.194.1.el8_4, python3-perf 4.18.0-305.194.1.el8_4, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:26535
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.196.1.el8_6, kernel 4.18.0-372.196.1.el8_6, bpftool 4.18.0-372.196.1.el8_6, kernel-core 4.18.0-372.196.1.el8_6, kernel-tools 4.18.0-372.196.1.el8_6, python3-perf 4.18.0-372.196.1.el8_6, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:26570
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.143.1.el8_8, kernel 4.18.0-477.143.1.el8_8, bpftool 4.18.0-477.143.1.el8_8, kernel-core 4.18.0-477.143.1.el8_8, kernel-tools 4.18.0-477.143.1.el8_8, python3-perf 4.18.0-477.143.1.el8_8, +8 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19521
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.5.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.5.1.el9_8
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18587
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.7.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.7.1.el10_2
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18134
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.72.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.72.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.72.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.72.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.72.1.el10_0
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:15883
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.126.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.126.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.126.1.el8_10
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:21706
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-trace 3.10.0-1160.155.1.rt56.1307.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.155.1.rt56.1307.el7
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:41236
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-kvm 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-core 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-modules 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-kvm 4.18.0-553.126.1.rt7.467.el8_10, kernel-rt-debug-core 4.18.0-553.126.1.rt7.467.el8_10, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:21745
  • Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-kvm 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-core 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-modules 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-kvm 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-core 5.14.0-70.178.1.rt21.250.el9_0, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:14137
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.5.1.el9_8, kernel-rt-64k 5.14.0-687.5.1.el9_8, kernel-rt-core 5.14.0-687.5.1.el9_8, kernel-rt-modules 5.14.0-687.5.1.el9_8, kernel-rt-64k-core 5.14.0-687.5.1.el9_8, kernel-rt-debug-core 5.14.0-687.5.1.el9_8, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18587
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.7.1.el10_2, kernel-rt-64k 6.12.0-211.7.1.el10_2, kernel-rt-core 6.12.0-211.7.1.el10_2, kernel-rt-modules 6.12.0-211.7.1.el10_2, kernel-rt-64k-core 6.12.0-211.7.1.el10_2, kernel-rt-debug-core 6.12.0-211.7.1.el10_2, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18134
  • Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-core 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-modules 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-core 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-debug-modules 5.14.0-70.178.1.rt21.250.el9_0, kernel-rt-modules-extra 5.14.0-70.178.1.rt21.250.el9_0, +2 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:14137
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-core 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-modules 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-debug-core 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-modules-core 5.14.0-284.172.1.rt14.457.el9_2, kernel-rt-debug-modules 5.14.0-284.172.1.rt14.457.el9_2, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:19875
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.72.1.el10_0, kernel-rt-64k 6.12.0-55.72.1.el10_0, kernel-rt-core 6.12.0-55.72.1.el10_0, kernel-rt-modules 6.12.0-55.72.1.el10_0, kernel-rt-64k-core 6.12.0-55.72.1.el10_0, kernel-rt-debug-core 6.12.0-55.72.1.el10_0, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:15883
  • Red Hat Enterprise Linux Real Time EUS (v.9.4) kernel-rt 5.14.0-427.127.1.el9_4, kernel-rt-core 5.14.0-427.127.1.el9_4, kernel-rt-modules 5.14.0-427.127.1.el9_4, kernel-rt-debug-core 5.14.0-427.127.1.el9_4, kernel-rt-modules-core 5.14.0-427.127.1.el9_4, kernel-rt-debug-modules 5.14.0-427.127.1.el9_4, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:21209
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.112.1.el9_6, kernel-rt-64k 5.14.0-570.112.1.el9_6, kernel-rt-core 5.14.0-570.112.1.el9_6, kernel-rt-modules 5.14.0-570.112.1.el9_6, kernel-rt-64k-core 5.14.0-570.112.1.el9_6, kernel-rt-debug-core 5.14.0-570.112.1.el9_6, +14 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:14339
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.5.1.el9_8, kernel-rt-core 5.14.0-687.5.1.el9_8, kernel-rt-modules 5.14.0-687.5.1.el9_8, kernel-rt-debug-core 5.14.0-687.5.1.el9_8, kernel-rt-modules-core 5.14.0-687.5.1.el9_8, kernel-rt-debug-modules 5.14.0-687.5.1.el9_8, +4 more
    fixed: vendor fix “To mitigate this issue, prevent module ib_umad from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.” RHSA-2026:18587

8 more fixed in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-295-11 updated cvss 7.8

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.7 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.7 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.7
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-26-209-04 updated cvss 7.8

Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP

  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= 3.1.6 Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) >= 3.1.6 Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) >= 3.1.6
    affected: mitigation, no fix available

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
4mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Linux Linux
  • Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
  • Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
  • Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.