SB2026090428 - Deadlock in Linux kernel mlx5 core driver
Published: September 4, 2026
Security Bulletin ID
SB2026090428
CSH 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 vulnerability.
1) Deadlock (CVE-ID: CVE-2026-80739)
CWE-ID: CWE-833 - Deadlock
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to improper lock management in mlx5e_tc_del_flow() when deleting a peer TC flow after lower-level FDB flow creation fails. A local privileged user can configure a traffic-control flower filter that creates a peer flow to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/585df8643081e6f616579bc52cd49ac823a57c82
- https://git.kernel.org/stable/c/607adbda01053abf5f93e322fe39325da8828cb8
- https://git.kernel.org/stable/c/6ddfba2ea98db21b001e0e5c472499156224650c
- https://git.kernel.org/stable/c/7165fe321c61ec138850c02f030f274797761f5f
- https://git.kernel.org/stable/c/ff9e7d5e3500be389ce7a0e46db3a77149830bc9