CVE-2026-98977

A flaw was found in the Linux kernel. A local attacker with the ability to create user and mount namespaces can trigger an improper filesystem lock during an automatic mount (automount) operation. Because the kernel incorrectly assigns mount locks across namespaces during propagation, the lock is applied to the host system instead of the unprivileged namespace. This can lead to a Denial of Service (DoS) by preventing host administrators from altering filesystem mount configurations, while potentially allowing unprivileged users to modify restricted mount options.

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.