Use-after-free in Linux kernel - CVE-2026-89488
Published: September 12, 2026
Vulnerability identifier: #VU149321
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-89488
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-89488
Install security update from vendor's repository.