CVE-2026-89959 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability caused by improper removal of control domains in vfio_ap_mdev_cfg_remove, letting attackers prevent unplugged control domains removal in KVM guests, exploit requires KVM guest access.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.18% chance of exploitation in 30 days
View the NVD record ↗

Details

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

Vendor fix

Update to the latest Linux kernel version containing the fix.

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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