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Fencer Intel
high 7.8

CVE-2026-99032 json

net/smc: protect clcsock lifetime in smc_getname

published 19d ago modified 12d ago also EUVD-2026-108827

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 5%
public exploits
0
none known

Summary

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

net/smc: protect clcsock lifetime in smc_getname

smc_getname() dereferences smc->clcsock without holding clcsock_release_lock. Link-group termination can release the CLC socket through smc_close_active_abort() while the SMC socket is still open, for example after shutdown(SHUT_WR).

A getsockname() caller can load smc->clcsock, then the termination worker can clear the pointer and call sock_release() before the caller accesses clcsock->ops or invokes getname(). This causes a use-after-free; if the worker clears the pointer before the load, it causes a NULL dereference. The syscall's file reference keeps the SMC socket alive but does not prevent asynchronous release of its CLC socket.

KASAN reported the following with test-only timing instrumentation:

BUG: KASAN: slab-use-after-free in smc_getname+0x19e/0x1b0 Read of size 8 at addr ffff888109abb4e0 by task poc/103 Call Trace: smc_getname+0x19e/0x1b0 do_getsockname+0xe5/0x170 __sys_getsockname+0x8c/0x100

Allocated by task 95: sock_alloc_inode+0x1e/0x280 sock_alloc+0x3d/0x240 __sock_create+0x7e/0x430 smc_create+0x121/0x240

Freed by task 0: kmem_cache_free+0xcc/0x340 rcu_core+0x50a/0x1850

Last potentially related work creation: evict+0x446/0x6c0 smc_clcsock_release+0xa8/0xd0 smc_close_active_abort+0x26a/0x3a0 __smc_lgr_terminate.part.0+0x137/0x2e0

Hold clcsock_release_lock across the pointer check and the getname() callback to serialize with smc_clcsock_release(). Return -EBADF if the CLC socket has already been released, preserving the existing peer state check and the callback's return value otherwise.

Patch / fix

  • Linux Linux 4.20, 7.3
  • linux Debian 13 6.12.113-1
  • linux Debian 14 7.2.11-1

debian advisories DEBIAN-CVE-2026-99032

  • linux Ubuntu 26.10 7.3.0-10.10
  • linux-aws Ubuntu 26.10 7.3.0-1004.4
  • linux-gcp Ubuntu 26.10 7.3.0-1004.4
  • linux-raspi Ubuntu 26.10 7.3.0-1004.4
  • linux-riscv Ubuntu 26.10 7.3.0-10.10.1
  • linux-oracle Ubuntu 26.10 7.3.0-1004.4
  • linux-realtime Ubuntu 26.10 7.3.0-10.10.1

ubuntu advisories UBUNTU-CVE-2026-99032

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 Azure Linux 3.0 6.6.161.1-1

azure linux advisories AZL-110891

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

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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-2026-99032 updated cvss 7.0

kernel: net/smc: protect clcsock lifetime in smc_getname

  • 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 Red Hat Enterprise Linux 10 kernel Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    affected: workaround, no fix available
  • Red Hat Enterprise Linux AppStream (v. 9) rv 5.14.0-741.22.1.el9_9, perf 5.14.0-741.22.1.el9_9, rtla 5.14.0-741.22.1.el9_9, python3-perf 5.14.0-741.22.1.el9_9, kernel-devel-matched 5.14.0-741.22.1.el9_9, kernel-64k-devel-matched 5.14.0-741.22.1.el9_9, +7 more
    fixed: vendor fix RHSA-2026:99135
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-553.186.1.el8_10, kernel 4.18.0-553.186.1.el8_10, bpftool 4.18.0-553.186.1.el8_10, kernel-core 4.18.0-553.186.1.el8_10, kernel-tools 4.18.0-553.186.1.el8_10, python3-perf 4.18.0-553.186.1.el8_10, +15 more
    fixed: vendor fix RHSA-2026:99015
  • Red Hat Enterprise Linux BaseOS (v. 9) kernel 5.14.0-741.22.1.el9_9, kernel-64k 5.14.0-741.22.1.el9_9, kernel-core 5.14.0-741.22.1.el9_9, kernel-tools 5.14.0-741.22.1.el9_9, kernel-modules 5.14.0-741.22.1.el9_9, kernel-64k-core 5.14.0-741.22.1.el9_9, +27 more Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) libperf 5.14.0-741.22.1.el9_9, kernel-debuginfo-common-s390x 5.14.0-741.22.1.el9_9, kernel-debuginfo-common-x86_64 5.14.0-741.22.1.el9_9, kernel-debuginfo-common-aarch64 5.14.0-741.22.1.el9_9, kernel-debuginfo-common-ppc64le 5.14.0-741.22.1.el9_9
    fixed: vendor fix RHSA-2026:99135
  • Red Hat Enterprise Linux CRB (v. 8) kernel-debuginfo-common-x86_64 4.18.0-553.186.1.el8_10, kernel-debuginfo-common-aarch64 4.18.0-553.186.1.el8_10, kernel-debuginfo-common-ppc64le 4.18.0-553.186.1.el8_10
    fixed: vendor fix RHSA-2026:99015
  • Red Hat Enterprise Linux NFV (v. 8) kernel-rt 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-kvm 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-core 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-modules 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-debug-kvm 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-debug-core 4.18.0-553.186.1.rt7.527.el8_10, +4 more
    fixed: vendor fix RHSA-2026:99031
  • Red Hat Enterprise Linux Real Time (v. 9) kernel-rt 5.14.0-741.22.1.el9_9, kernel-rt-64k 5.14.0-741.22.1.el9_9, kernel-rt-core 5.14.0-741.22.1.el9_9, kernel-rt-modules 5.14.0-741.22.1.el9_9, kernel-rt-64k-core 5.14.0-741.22.1.el9_9, kernel-rt-debug-core 5.14.0-741.22.1.el9_9, +14 more Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt 5.14.0-741.22.1.el9_9, kernel-rt-core 5.14.0-741.22.1.el9_9, kernel-rt-modules 5.14.0-741.22.1.el9_9, kernel-rt-debug-core 5.14.0-741.22.1.el9_9, kernel-rt-modules-core 5.14.0-741.22.1.el9_9, kernel-rt-debug-modules 5.14.0-741.22.1.el9_9, +5 more
    fixed: vendor fix RHSA-2026:99135
  • Red Hat Enterprise Linux RT (v. 8) kernel-rt 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-core 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-modules 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-debug-core 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-debug-modules 4.18.0-553.186.1.rt7.527.el8_10, kernel-rt-modules-extra 4.18.0-553.186.1.rt7.527.el8_10, +2 more
    fixed: vendor fix RHSA-2026:99031
show 1 more
  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    not affected: vulnerable code not present

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

Exploit prediction

0.16% chance of exploitation in the next 30 days, higher than 5% of all scored CVEs (FIRST EPSS, 2026-11-11).

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

Classification

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.