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high 7.1

CVE-2026-63920 json

ipv6: validate extension header length before copying to cmsg

published 3mo ago modified 15d ago also EUVD-2026-45693

cvss
7.1
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 6%
public exploits
0
none known

Summary

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

ipv6: validate extension header length before copying to cmsg

ip6_datagram_recv_specific_ctl() builds IPV6_{HOPOPTS,DSTOPTS,RTHDR} cmsgs (and their IPV6_2292* legacy counterparts) by trusting the on-wire hdrlen byte (ptr[1]) when computing the put_cmsg() length. The length was validated only at parse time (ipv6_parse_hopopts(), etc.). An nftables payload-write expression can rewrite hdrlen after parsing and before the skb reaches recvmsg; the write itself is in-bounds but put_cmsg() then reads up to ((hdrlen+1) << 3) = 2040 bytes from an 8-byte header. nftables is reachable from an unprivileged user namespace, so this is an unprivileged slab-out-of-bounds read:

BUG: KASAN: slab-out-of-bounds in put_cmsg+0x3ac/0x540 put_cmsg+0x3ac/0x540 udpv6_recvmsg+0xca0/0x1250 sock_recvmsg+0xdf/0x190 ____sys_recvmsg+0x1b1/0x620

Add ipv6_get_exthdr_len() which validates that at least two bytes are accessible before reading the hdrlen field, then checks the computed length against skb_tail_pointer(skb), returning 0 on failure. Extension headers are kept in the linear skb area by pskb_may_pull() during input, so skb_tail_pointer() is the correct bound.

Use ipv6_get_exthdr_len() at all non-AH call sites: the five standalone cmsg blocks (HbH, 2292HbH, 2292DSTOPTS x2, 2292RTHDR) and the three standard cases in the extension-header walk loop (DSTOPTS, ROUTING, default). AH retains an inline bounds check because its length formula differs ((ptr[1]+2)<<2).

The walk loop also gets a pre-read bounds check at the top to validate ptr before any case accesses ptr[0] or ptr[1].

When the walk loop detects a corrupted header, return from the function instead of continuing to process later socket options.

Patch / fix

  • Linux Linux 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35, 7.0.12, 7.1
  • linux Debian 12 6.1.176-1
  • linux Debian 13 6.12.94-1
  • linux Debian 14 7.0.12-1

debian advisories DEBIAN-CVE-2026-63920

  • linux Ubuntu 22.04 LTS 5.15.0-198.208
  • linux Ubuntu 24.04 LTS 6.8.0-146.146
  • linux Ubuntu 26.04 LTS 7.0.0-28.28
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1117.124
  • linux-aws Ubuntu 24.04 LTS 6.8.0-1066.69
  • linux-aws Ubuntu 26.04 LTS 7.0.0-1009.9
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1118.128
  • linux-gcp Ubuntu 24.04 LTS 6.8.0-1070.78

ubuntu advisories UBUNTU-CVE-2026-63920

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 RHEL 8 4.18.0-553.173.1.el8_10
  • perf RHEL 8 4.18.0-553.173.1.el8_10
  • bpftool RHEL 8 4.18.0-553.173.1.el8_10
  • kernel-core RHEL 8 4.18.0-553.173.1.el8_10
  • kernel-tools RHEL 8 4.18.0-553.173.1.el8_10
  • python3-perf RHEL 8 4.18.0-553.173.1.el8_10
  • kernel-modules RHEL 8 4.18.0-553.173.1.el8_10
  • kernel-zfcpdump RHEL 8 4.18.0-553.173.1.el8_10

red hat advisories RHSA-2026:85000RHSA-2026:84793RHSA-2026:84677RHSA-2026:83707RHSA-2026:82807RHSA-2026:82806

  • kernel-64kb SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS, SLE High Performance Computing 15 SP5-ESPOS 5.14.21-150500.55.189.1
  • kernel-syms SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.189.1
  • kernel-source SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.189.1
  • kernel-default SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +3 more 5.14.21-150500.55.189.1
  • kernel-obs-build SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE High Performance Computing 15 SP5-LTSS +1 more 5.14.21-150500.55.189.1
  • kernel-default-base SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 5.14.21-150500.55.189.1.150500.6.87.4
  • kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.81.1
  • kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.81.1

suse advisories SUSE-SU-2026:4595-1SUSE-SU-2026:4586-1SUSE-SU-2026:4254-1SUSE-SU-2026:4570-1SUSE-SU-2026:4561-1SUSE-SU-2026:4559-1

  • kernel-rt openSUSE Leap 16.0 6.12.0-160000.38.1
  • dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-64kb openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-syms openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-azure openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-source openSUSE Leap 16.0 6.12.0-160000.38.1
  • kernel-default openSUSE Leap 16.0 6.12.0-160000.38.1

opensuse advisories openSUSE-SU-2026:21910-1

  • kernel-rt AlmaLinux 8 4.18.0-553.173.1.rt7.514.el8_10
  • kernel-rt-core AlmaLinux 8 4.18.0-553.173.1.rt7.514.el8_10
  • kernel-rt-modules AlmaLinux 8 4.18.0-553.173.1.rt7.514.el8_10
  • kernel-rt-debug-core AlmaLinux 8 4.18.0-553.173.1.rt7.514.el8_10
  • kernel-rt-debug-modules AlmaLinux 8 4.18.0-553.173.1.rt7.514.el8_10
  • kernel-rt-modules-extra AlmaLinux 8 4.18.0-553.173.1.rt7.514.el8_10
  • kernel-rt-debug-modules-extra AlmaLinux 8 4.18.0-553.173.1.rt7.514.el8_10
  • kernel AlmaLinux 8 4.18.0-553.173.1.el8_10

almalinux advisories ALSA-2026:82806ALSA-2026:82807ALSA-2026:76738

  • kernel-rt Rocky Linux 8 4.18.0-553.173.1.rt7.514.el8_10
  • kernel Rocky Linux 8 4.18.0-553.173.1.el8_10

rocky linux advisories RLSA-2026:82806RLSA-2026:82807

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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-2026-63920 updated cvss 7.0

kernel: ipv6: validate extension header length before copying to cmsg

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
    affected: no fix planned “Out of support scope”
  • 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: no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.6) libperf 5.14.0-570.147.1.el9_6, kernel-debuginfo-common-s390x 5.14.0-570.147.1.el9_6, kernel-debuginfo-common-x86_64 5.14.0-570.147.1.el9_6, kernel-debuginfo-common-aarch64 5.14.0-570.147.1.el9_6, kernel-debuginfo-common-ppc64le 5.14.0-570.147.1.el9_6
    fixed: vendor fix RHSA-2026:77219
  • Red Hat Enterprise Linux kernel-modules-internal 6.12.0-211.63.1.el10_2
    fixed: vendor fix RHSA-2026:76738
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-687.55.1.el9_8, perf 5.14.0-687.55.1.el9_8, rtla 5.14.0-687.55.1.el9_8, python3-perf 5.14.0-687.55.1.el9_8, kernel-devel-matched 5.14.0-687.55.1.el9_8, kernel-64k-devel-matched 5.14.0-687.55.1.el9_8, +7 more
    fixed: vendor fix RHSA-2026:76739
  • Red Hat Enterprise Linux AppStream (v. 10) rv 6.12.0-211.63.1.el10_2, perf 6.12.0-211.63.1.el10_2, rtla 6.12.0-211.63.1.el10_2, python3-perf 6.12.0-211.63.1.el10_2, kernel-devel-matched 6.12.0-211.63.1.el10_2, kernel-64k-devel-matched 6.12.0-211.63.1.el10_2, +7 more
    fixed: vendor fix RHSA-2026:76738
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) perf 5.14.0-284.200.1.el9_2, rtla 5.14.0-284.200.1.el9_2, kernel-devel-matched 5.14.0-284.200.1.el9_2, kernel-64k-devel-matched 5.14.0-284.200.1.el9_2, kernel-debug-devel-matched 5.14.0-284.200.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.200.1.el9_2, +5 more
    fixed: vendor fix RHSA-2026:92993
  • Red Hat Enterprise Linux AppStream E4S (v.9.4) rv 5.14.0-427.154.1.el9_4, perf 5.14.0-427.154.1.el9_4, rtla 5.14.0-427.154.1.el9_4, kernel-devel-matched 5.14.0-427.154.1.el9_4, kernel-64k-devel-matched 5.14.0-427.154.1.el9_4, kernel-debug-devel-matched 5.14.0-427.154.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:77218
show 32 more
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) rv 6.12.0-55.111.1.el10_0, perf 6.12.0-55.111.1.el10_0, rtla 6.12.0-55.111.1.el10_0, python3-perf 6.12.0-55.111.1.el10_0, kernel-devel-matched 6.12.0-55.111.1.el10_0, kernel-64k-devel-matched 6.12.0-55.111.1.el10_0, +7 more
    fixed: vendor fix RHSA-2026:83707
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) rv 5.14.0-570.147.1.el9_6, perf 5.14.0-570.147.1.el9_6, rtla 5.14.0-570.147.1.el9_6, python3-perf 5.14.0-570.147.1.el9_6, kernel-devel-matched 5.14.0-570.147.1.el9_6, kernel-64k-devel-matched 5.14.0-570.147.1.el9_6, +7 more
    fixed: vendor fix RHSA-2026:77219
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.173.1.el8_10, kernel 4.18.0-553.173.1.el8_10, bpftool 4.18.0-553.173.1.el8_10, kernel-core 4.18.0-553.173.1.el8_10, kernel-tools 4.18.0-553.173.1.el8_10, python3-perf 4.18.0-553.173.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:82807
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-687.55.1.el9_8, kernel-64k 5.14.0-687.55.1.el9_8, kernel-core 5.14.0-687.55.1.el9_8, kernel-tools 5.14.0-687.55.1.el9_8, kernel-modules 5.14.0-687.55.1.el9_8, kernel-64k-core 5.14.0-687.55.1.el9_8, +27 more
    fixed: vendor fix RHSA-2026:76739
  • Red Hat Enterprise Linux BaseOS (v. 10) kernel 6.12.0-211.63.1.el10_2, kernel-64k 6.12.0-211.63.1.el10_2, kernel-core 6.12.0-211.63.1.el10_2, kernel-tools 6.12.0-211.63.1.el10_2, kernel-modules 6.12.0-211.63.1.el10_2, kernel-64k-core 6.12.0-211.63.1.el10_2, +28 more
    fixed: vendor fix RHSA-2026:76738
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) perf 4.18.0-305.214.1.el8_4, kernel 4.18.0-305.214.1.el8_4, bpftool 4.18.0-305.214.1.el8_4, kernel-core 4.18.0-305.214.1.el8_4, kernel-tools 4.18.0-305.214.1.el8_4, python3-perf 4.18.0-305.214.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:84677
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) perf 4.18.0-372.223.1.el8_6, kernel 4.18.0-372.223.1.el8_6, bpftool 4.18.0-372.223.1.el8_6, kernel-core 4.18.0-372.223.1.el8_6, kernel-tools 4.18.0-372.223.1.el8_6, python3-perf 4.18.0-372.223.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:85000
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) perf 4.18.0-477.175.1.el8_8, kernel 4.18.0-477.175.1.el8_8, bpftool 4.18.0-477.175.1.el8_8, kernel-core 4.18.0-477.175.1.el8_8, kernel-tools 4.18.0-477.175.1.el8_8, python3-perf 4.18.0-477.175.1.el8_8, +9 more
    fixed: vendor fix RHSA-2026:84793
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) bpftool 7.0.0-284.200.1.el9_2, kernel 5.14.0-284.200.1.el9_2, kernel-64k 5.14.0-284.200.1.el9_2, kernel-core 5.14.0-284.200.1.el9_2, kernel-tools 5.14.0-284.200.1.el9_2, python3-perf 5.14.0-284.200.1.el9_2, +28 more
    fixed: vendor fix RHSA-2026:92993
  • Red Hat Enterprise Linux BaseOS E4S (v.9.4) bpftool 7.3.0-427.154.1.el9_4, kernel 5.14.0-427.154.1.el9_4, kernel-64k 5.14.0-427.154.1.el9_4, kernel-core 5.14.0-427.154.1.el9_4, kernel-tools 5.14.0-427.154.1.el9_4, python3-perf 5.14.0-427.154.1.el9_4, +28 more
    fixed: vendor fix RHSA-2026:77218
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) kernel 6.12.0-55.111.1.el10_0, kernel-64k 6.12.0-55.111.1.el10_0, kernel-core 6.12.0-55.111.1.el10_0, kernel-tools 6.12.0-55.111.1.el10_0, kernel-modules 6.12.0-55.111.1.el10_0, kernel-64k-core 6.12.0-55.111.1.el10_0, +27 more
    fixed: vendor fix RHSA-2026:83707
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) kernel 5.14.0-570.147.1.el9_6, kernel-64k 5.14.0-570.147.1.el9_6, kernel-core 5.14.0-570.147.1.el9_6, kernel-tools 5.14.0-570.147.1.el9_6, kernel-modules 5.14.0-570.147.1.el9_6, kernel-64k-core 5.14.0-570.147.1.el9_6, +27 more
    fixed: vendor fix RHSA-2026:77219
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) perf 4.18.0-305.214.1.el8_4, kernel 4.18.0-305.214.1.el8_4, bpftool 4.18.0-305.214.1.el8_4, kernel-core 4.18.0-305.214.1.el8_4, kernel-tools 4.18.0-305.214.1.el8_4, python3-perf 4.18.0-305.214.1.el8_4, +8 more
    fixed: vendor fix RHSA-2026:84677
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) perf 4.18.0-372.223.1.el8_6, kernel 4.18.0-372.223.1.el8_6, bpftool 4.18.0-372.223.1.el8_6, kernel-core 4.18.0-372.223.1.el8_6, kernel-tools 4.18.0-372.223.1.el8_6, python3-perf 4.18.0-372.223.1.el8_6, +8 more
    fixed: vendor fix RHSA-2026:85000
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) perf 4.18.0-477.175.1.el8_8, kernel 4.18.0-477.175.1.el8_8, bpftool 4.18.0-477.175.1.el8_8, kernel-core 4.18.0-477.175.1.el8_8, kernel-tools 4.18.0-477.175.1.el8_8, python3-perf 4.18.0-477.175.1.el8_8, +8 more
    fixed: vendor fix RHSA-2026:84793
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-687.55.1.el9_8, kernel-debuginfo-common-s390x 5.14.0-687.55.1.el9_8, kernel-debuginfo-common-x86_64 5.14.0-687.55.1.el9_8, kernel-debuginfo-common-aarch64 5.14.0-687.55.1.el9_8, kernel-debuginfo-common-ppc64le 5.14.0-687.55.1.el9_8
    fixed: vendor fix RHSA-2026:76739
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) libperf 6.12.0-211.63.1.el10_2, kernel-debuginfo-common-s390x 6.12.0-211.63.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.63.1.el10_2, kernel-debuginfo-common-aarch64 6.12.0-211.63.1.el10_2, kernel-debuginfo-common-ppc64le 6.12.0-211.63.1.el10_2
    fixed: vendor fix RHSA-2026:76738
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) libperf 6.12.0-55.111.1.el10_0, kernel-debuginfo-common-s390x 6.12.0-55.111.1.el10_0, kernel-debuginfo-common-x86_64 6.12.0-55.111.1.el10_0, kernel-debuginfo-common-aarch64 6.12.0-55.111.1.el10_0, kernel-debuginfo-common-ppc64le 6.12.0-55.111.1.el10_0
    fixed: vendor fix RHSA-2026:83707
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.173.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.173.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.173.1.el8_10
    fixed: vendor fix RHSA-2026:82807
  • Red Hat Enterprise Linux for Real Time (v. 7 ELS) kernel-rt 3.10.0-1160.169.1.rt56.1321.el7, kernel-rt-trace 3.10.0-1160.169.1.rt56.1321.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-1160.169.1.rt56.1321.el7
    fixed: vendor fix RHSA-2026:95721
  • Red Hat Enterprise Linux Hidden (v. 10) kernel-modules-internal 6.12.0-211.63.1.el10_2, kernel-debuginfo-common-x86_64 6.12.0-211.63.1.el10_2
    fixed: vendor fix RHSA-2026:76738
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-kvm 4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-core 4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-modules 4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-debug-kvm 4.18.0-553.173.1.rt7.514.el8_10, kernel-rt-debug-core 4.18.0-553.173.1.rt7.514.el8_10, +4 more
    fixed: vendor fix RHSA-2026:82806
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-687.55.1.el9_8, kernel-rt-64k 5.14.0-687.55.1.el9_8, kernel-rt-core 5.14.0-687.55.1.el9_8, kernel-rt-modules 5.14.0-687.55.1.el9_8, kernel-rt-64k-core 5.14.0-687.55.1.el9_8, kernel-rt-debug-core 5.14.0-687.55.1.el9_8, +14 more
    fixed: vendor fix RHSA-2026:76739
  • Red Hat Enterprise Linux Real Time (v. 10) kernel-rt 6.12.0-211.63.1.el10_2, kernel-rt-64k 6.12.0-211.63.1.el10_2, kernel-rt-core 6.12.0-211.63.1.el10_2, kernel-rt-modules 6.12.0-211.63.1.el10_2, kernel-rt-64k-core 6.12.0-211.63.1.el10_2, kernel-rt-debug-core 6.12.0-211.63.1.el10_2, +14 more
    fixed: vendor fix RHSA-2026:76738
  • Red Hat Enterprise Linux Real Time E4S (v.9.2) kernel-rt 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-core 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-modules 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-debug-core 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-modules-core 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-debug-modules 5.14.0-284.200.1.rt14.485.el9_2, +4 more
    fixed: vendor fix RHSA-2026:93047
  • Red Hat Enterprise Linux Real Time E4S (v.9.4) kernel-rt 5.14.0-427.154.1.el9_4, kernel-rt-core 5.14.0-427.154.1.el9_4, kernel-rt-modules 5.14.0-427.154.1.el9_4, kernel-rt-debug-core 5.14.0-427.154.1.el9_4, kernel-rt-modules-core 5.14.0-427.154.1.el9_4, kernel-rt-debug-modules 5.14.0-427.154.1.el9_4, +4 more
    fixed: vendor fix RHSA-2026:77218
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0) kernel-rt 6.12.0-55.111.1.el10_0, kernel-rt-64k 6.12.0-55.111.1.el10_0, kernel-rt-core 6.12.0-55.111.1.el10_0, kernel-rt-modules 6.12.0-55.111.1.el10_0, kernel-rt-64k-core 6.12.0-55.111.1.el10_0, kernel-rt-debug-core 6.12.0-55.111.1.el10_0, +14 more
    fixed: vendor fix RHSA-2026:83707
  • Red Hat Enterprise Linux Real Time EUS (v.9.6) kernel-rt 5.14.0-570.147.1.el9_6, kernel-rt-64k 5.14.0-570.147.1.el9_6, kernel-rt-core 5.14.0-570.147.1.el9_6, kernel-rt-modules 5.14.0-570.147.1.el9_6, kernel-rt-64k-core 5.14.0-570.147.1.el9_6, kernel-rt-debug-core 5.14.0-570.147.1.el9_6, +14 more
    fixed: vendor fix RHSA-2026:77219
  • Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-687.55.1.el9_8, kernel-rt-core 5.14.0-687.55.1.el9_8, kernel-rt-modules 5.14.0-687.55.1.el9_8, kernel-rt-debug-core 5.14.0-687.55.1.el9_8, kernel-rt-modules-core 5.14.0-687.55.1.el9_8, kernel-rt-debug-modules 5.14.0-687.55.1.el9_8, +4 more
    fixed: vendor fix RHSA-2026:76739
  • Red Hat Enterprise Linux Real Time for NFV (v. 10) kernel-rt 6.12.0-211.63.1.el10_2, kernel-rt-core 6.12.0-211.63.1.el10_2, kernel-rt-modules 6.12.0-211.63.1.el10_2, kernel-rt-debug-core 6.12.0-211.63.1.el10_2, kernel-rt-modules-core 6.12.0-211.63.1.el10_2, kernel-rt-debug-modules 6.12.0-211.63.1.el10_2, +4 more
    fixed: vendor fix RHSA-2026:76738
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2) kernel-rt 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-kvm 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-core 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-modules 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-debug-kvm 5.14.0-284.200.1.rt14.485.el9_2, kernel-rt-debug-core 5.14.0-284.200.1.rt14.485.el9_2, +6 more
    fixed: vendor fix RHSA-2026:93047
  • Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4) kernel-rt 5.14.0-427.154.1.el9_4, kernel-rt-kvm 5.14.0-427.154.1.el9_4, kernel-rt-core 5.14.0-427.154.1.el9_4, kernel-rt-modules 5.14.0-427.154.1.el9_4, kernel-rt-debug-kvm 5.14.0-427.154.1.el9_4, kernel-rt-debug-core 5.14.0-427.154.1.el9_4, +6 more
    fixed: vendor fix RHSA-2026:77218

5 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 SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
26d ago

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

  • Linux Linux

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.