SB20260912187 - Use-after-free in Linux kernel notify fanotify
Published: September 12, 2026
Security Bulletin ID
SB20260912187
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-2026-89600)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.