SB20260912299 - Use-after-free in Linux kernel openvswitch
Published: September 12, 2026
Security Bulletin ID
SB20260912299
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-89488)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to trigger a slab use-after-free.
The vulnerability exists due to a race condition leading to use-after-free in the Open vSwitch conntrack limit state when tearing down a network namespace while packet processing accesses the state. A local user can tear down a network namespace while packet processing accesses CT limit state to trigger a slab use-after-free.
Exploitation requires a user and network namespace.
Remediation
Install update from vendor's website.