Use-after-free in Linux kernel - CVE-2026-31715
Published: May 2, 2026
Vulnerability identifier: #VU128982
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-31715
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in f2fs_write_end_io() and f2fs_in_warm_node_list() when handling concurrent write completion and unmount operations. A local user can trigger the race condition to cause a denial of service.
The issue can lead to a NULL pointer dereference and kernel panic during processing of F2FS checkpoint data pages.
How to mitigate CVE-2026-31715
Install security update from vendor's repository.