SB2026040695 - Race condition in Linux kernel core en_accel driver

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Main Vulnerability Database SB2026040695

SB2026040695 - Race condition in Linux kernel core en_accel driver

Published: April 6, 2026

Security Bulletin ID SB2026040695
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) Race condition (CVE-ID: CVE-2026-23440)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 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/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a race condition in the net/mlx5e IPSec ESN update handling path when processing ESN wrap events in IPSec full offload mode. A local user can trigger duplicate ESN update handling to cause a denial of service.

Processing the same event twice can incorrectly increment the ESN high-order bits and program invalid ESN state into hardware, resulting in anti-replay failures and a complete halt of IPSec traffic.


Remediation

Install update from vendor's website.

References