CVE-2026-89777 Linux Kernel vfio/pci - Use After Free

Linux kernel vfio/pci contains a use-after-free vulnerability caused by a dangling pointer in vdev->msi_perm after init failure, letting attackers cause kernel crashes or execute arbitrary code, exploit requires device open failure condition.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Use After Free
Impact
Denial Of Service, Privilege Escalation
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 that nulls vdev->msi_perm after free.

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