CVE-2026-89960 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in s390/vfio-ap due to stale pqap_hook pointer in vfio_ap_mdev_set_kvm(), letting attackers cause memory corruption or system instability, exploit requires triggering specific error conditions in KVM instance assignment.

CVSS base score 8.8 /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
Use After Free
Impact
Denial Of Service, Remote Code Execution
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 for s390/vfio-ap stale pqap_hook pointer issue.

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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