SB2026090611 - Use-after-free in Linux kernel futex
Published: September 6, 2026
Security Bulletin ID
SB2026090611
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-2026-80758)
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 access freed kernel memory.
The vulnerability exists due to use-after-free in futex_private_hash_put() when releasing the final reference to a private futex hash. A local user can trigger a race that frees the old hash before the function reads its mm pointer to access freed kernel memory.
The race requires the task releasing the final reference to be preempted before it reads the mm pointer.
Remediation
Install update from vendor's website.