CVE-2026-98921
kernel: ovl: fix UAF in ovl_do_mkdir() debug print
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 23, 2026
Updated · October 30, 2026
Description
A flaw was found in the Linux kernel's OverlayFS subsystem. When debug logging is enabled, a directory creation operation can trigger a use-after-free condition by referencing a directory entry that has already been released by the virtual file system. A local user could exploit this flaw to crash the system, resulting in a Denial of Service (DoS), or potentially corrupt kernel memory.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 4.7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-825 · Expired Pointer Dereference