CVE-2026-98993

A flaw was found in the Linux kernel's mount namespace subsystem. A local attacker can trigger an unmount flag inheritance issue when cloning a lazily unmounted mount that is kept open by a file descriptor. This improper flag inheritance leads to incorrect reference counting and a use-after-free condition where freed namespace memory is accessed. A local user can exploit this vulnerability to crash the system, leading to a Denial of Service (DoS).

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.