SB20260529122 - Improper locking in Linux kernel openvswitch
Published: May 29, 2026
Security Bulletin ID
SB20260529122
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) Improper locking (CVE-ID: CVE-2026-46165)
CWE-ID: CWE-667 - Improper Locking
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 improper locking in the openvswitch vport release logic when removing tunnel ports. A local user can trigger device removal to cause a denial of service.
The issue results in a self-deadlock during device removal because the RCU callback that releases the reference is not reached.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/366c482965c673565ecb8bcfb15d5548f13a6a10
- https://git.kernel.org/stable/c/3df75fff46b1517eb479d8e6b8e3500763715dd0
- https://git.kernel.org/stable/c/6522d59fb7de55ce0f0f285d962243ddffebb01f
- https://git.kernel.org/stable/c/aa69918bd418e700309fdd08509dba324fb24296
- https://git.kernel.org/stable/c/c741433f6c8dcdecd1d9549d89053761fd1ea413