CVE-2026-89775 Linux Kernel KVM arm64 - Denial of Service

Linux kernel KVM arm64 contains a logic error caused by improper handling of negative S1 walk levels in VNCR TLB size evaluation, letting attackers potentially cause incorrect TLB invalidation size calculation, exploit requires kernel-level access.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.23% 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:N/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 negative S1 walk levels in VNCR TLB size evaluation.

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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