SB20260905175 - Use-after-free in Linux kernel futex
Published: September 5, 2026
Security Bulletin ID
SB20260905175
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-80778)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a use-after-free condition.
The vulnerability exists due to a use-after-free in attach_to_pi_owner() when attaching a private futex key to an owner in a different address space. A remote attacker can trigger concurrent private futex owner cleanup across different address spaces to cause a use-after-free condition.
The issue applies to private futexes on systems configured with MMU support.
Remediation
Install update from vendor's website.