SB2026040695 - Race condition in Linux kernel core en_accel driver
Published: April 6, 2026
Security Bulletin ID
SB2026040695
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Race condition (CVE-ID: CVE-2026-23440)
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
- https://git.kernel.org/stable/c/2051c709dce92da3550040aa7949cd5a9c89b14e
- https://git.kernel.org/stable/c/3dffc083292e6872787bd7e34b957627622f9af4
- https://git.kernel.org/stable/c/8d625c15471fb8780125eaef682983a96af77bdc
- https://git.kernel.org/stable/c/96c9c25b74686ac2de15921c9ad30c5ef13af8cd
- https://git.kernel.org/stable/c/beb6e2e5976a128b0cccf10d158124422210c5ef