CVE-2026-89929 Linux Kernel KVM - Information Disclosure

Linux kernel KVM nested virtualization contains a logic flaw in INVVPID emulation causing TLB invalidation on incorrect physical CPU, letting attackers cause stale TLB entries, exploit requires nested virtualization and CPU migration.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.17% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Information Disclosure
Impact
Information Disclosure
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 INVVPID emulation on correct physical CPU.

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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