CVE-2026-89560 Linux Kernel - Broken Access Control

Linux kernel contains a permission control vulnerability in Landlock where whiteout creation in OverlayFS was improperly guarded, allowing unprivileged users to create whiteout objects without proper LANDLOCK_ACCESS_FS_MAKE_REG permission, exploit requires userspace access to OverlayFS whiteout creation.

CVSS base score 8.4 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.13% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the Linux kernel version containing the Landlock patch that requires LANDLOCK_ACCESS_FS_MAKE_REG for whiteout creation.

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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