CVE-2026-98991 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by multiple queuing of mounts in notify_list due to missing checks in mnt_notify_add(), letting attackers cause kernel memory corruption, exploit requires mounts with MNT_SHRINKABLE flag and specific namespace conditions.

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

Details

Type
Use After Free
Impact
Denial Of Service
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 mount notification queuing.

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

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