SB2026082483 - Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel smc

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Main Vulnerability Database SB2026082483

SB2026082483 - Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel smc

Published: August 24, 2026

Security Bulletin ID SB2026082483
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-74692)

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a time-of-check time-of-use race condition in smc_listen_out() in net/smc/af_smc.c when handling TCP connection attempts while a listener is being closed. A remote attacker can open TCP connections during the race window to cause a denial of service.

The issue can leak child smc_sock objects, their clcsock objects, and references, which can exhaust kernel memory.


Remediation

Install update from vendor's website.

References