---
id: CVE-2026-99032
title: 'net/smc: protect clcsock lifetime in smc_getname'
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 C…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 <
    e607017a553d2a48e428ec8b8ffb06bf3bb92ce9
  - >-
    Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 <
    1512e3714b3946bda75a160a34f22a51710daa43
  - >-
    Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 <
    6a1833f0d7dc037c8e876b9178ba69d5d107c086
  - >-
    Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 <
    c223da71abfaea2ebb1c7208ae9ebf15038f9388
  - >-
    Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 <
    64a6b36b0e1855288080bc5f89769f27d6dc03c8
  - Linux 0b6153d04c96a1d4b6284692386aa21d04d7956c
  - Linux >= 4.19.299 < 4.20
  - Linux 5.1
published: '2026-10-23'
updated: '2026-10-24'
sourceUpdated: '2026-10-24T14:10:08.095Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-99032'
references:
  - url: 'https://git.kernel.org/stable/c/e607017a553d2a48e428ec8b8ffb06bf3bb92ce9'
  - url: 'https://git.kernel.org/stable/c/1512e3714b3946bda75a160a34f22a51710daa43'
  - url: 'https://git.kernel.org/stable/c/6a1833f0d7dc037c8e876b9178ba69d5d107c086'
  - url: 'https://git.kernel.org/stable/c/c223da71abfaea2ebb1c7208ae9ebf15038f9388'
  - url: 'https://git.kernel.org/stable/c/64a6b36b0e1855288080bc5f89769f27d6dc03c8'
tags:
  - cve.org
epss: 0.00209
epssPercentile: 0.10515
ingestedAt: '2026-10-23T13:24:55.530Z'
---

## Overview

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.

## Affected

- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < e607017a553d2a48e428ec8b8ffb06bf3bb92ce9`
- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 1512e3714b3946bda75a160a34f22a51710daa43`
- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 6a1833f0d7dc037c8e876b9178ba69d5d107c086`
- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < c223da71abfaea2ebb1c7208ae9ebf15038f9388`
- `Linux >= b03faa1fafc8018295401dc558bdc76362d860a4 < 64a6b36b0e1855288080bc5f89769f27d6dc03c8`
- `Linux 0b6153d04c96a1d4b6284692386aa21d04d7956c`
- `Linux >= 4.19.299 < 4.20`
- `Linux 5.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.