CVE-2026-98993 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability caused by improper inheritance of MNT_UMOUNT flag in clone_mnt(), letting attackers cause mount namespace inconsistencies and resource leaks, exploit requires crafted mount and unmount operations.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.21% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Denial Of Service, Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for MNT_UMOUNT inheritance in clone_mnt().

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs