CVE-2026-99084
kernel: readdir: take no inode lock on an immutable directory
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 23, 2026
Updated · October 27, 2026
Description
A flaw was found in the Linux kernel. A local user can cause a Denial of Service (DoS) by stalling lock acquisition on a shared nullfs directory. Because root inodes in empty mount namespaces are shared across independent users and kernel threads, delaying directory iteration blocks subsequent file lookups and mount operations system-wide.
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 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-412 · Unrestricted Externally Accessible Lock