Use-after-free in Linux kernel - CVE-2026-80778
Published: September 5, 2026
Vulnerability identifier: #VU147144
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-80778
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-80778
Install security update from vendor's repository.