CVE-2026-98927 Linux Kernel KVM arm64 - Use After Free

Linux kernel KVM arm64 contains a use-after-free vulnerability caused by improper lifecycle management of nested_mmus array used for shadow page tables in nested virtualization, letting attackers cause memory corruption during VCPU_INIT, exploit requires running nested L2 guest.

CVSS base score 7.0 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.21% 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:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
23 October 2026
Updated
25 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for nested_mmus lifecycle.

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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