Use-after-free in Linux kernel - CVE-2026-80857
Published: September 5, 2026
Vulnerability identifier: #VU147065
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80857
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a use-after-free.
The vulnerability exists due to a failure to wait for request completion in the FUSE request_wait_answer() function when the abort_on_kill path is triggered while fuse_dev_do_write() is concurrently processing the same request. A local user can trigger the abort_on_kill path for a concurrently processed request to cause a use-after-free.
Exploitation requires the request to be marked FR_LOCKED while its arguments are freed.
Affected software
Linux kernel
How to mitigate CVE-2026-80857
Install security update from vendor's repository.