Use-after-free in Linux kernel - CVE-2026-89600
Published: September 12, 2026
Vulnerability identifier: #VU149209
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89600
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose stale kernel stack data.
The vulnerability exists due to use-after-free in fanotify permission event range information handling when a reader processes an event after a signal interrupts the triggering task. A local user can trigger a race between the event reader and the triggering task to disclose stale kernel stack data.
Affected software
Linux kernel
How to mitigate CVE-2026-89600
Install security update from vendor's repository.