CVE-2026-89767 Linux Kernel overlayfs - Denial of Service

Linux kernel overlayfs contains a double end_creating() call caused by casefold-mismatch in ovl_create_real(), letting unprivileged users cause a deadlock by unlocking a lock twice during directory creation, exploit requires unprivileged user access.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
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
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for double end_creating() in overlayfs.

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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