SB2026081583 - Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel sw rxe driver

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Main Vulnerability Database SB2026081583

SB2026081583 - Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel sw rxe driver

Published: August 15, 2026

Security Bulletin ID SB2026081583
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 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-2026-74378)

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

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a heap-based buffer overflow.

The vulnerability exists due to a time-of-check time-of-use race in get_srq_wqe() when copying a work queue element from a shared receive queue buffer mapped into userspace. A local user can modify num_sge between validation and size calculation to cause a heap-based buffer overflow.

The issue arises because the num_sge field is read twice from shared userspace-accessible memory.


Remediation

Install update from vendor's website.

References