CVE-2026-64288

Summary

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB

VNCR TLB invalidation occurs from MMU notifiers or TLBI instructions, and either can race against a vcpu not being onlined yet (no pseudo-TLB allocated). Similarly, the TLB might be invalid, and the invalidation should be skipped in this case.

Both kvm_invalidate_vncr_ipa() and kvm_invalidate_vncr_va() are expected to perform the same checks, except that the latter doesn't check for the allocation and blindly dereferences the pointer.

Solve this by introducing a new iterator built on top of the usual kvm_for_each_vcpu() that checks for both of the above conditions, and convert the two users to it.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 < 7c73a269a880b1399baacfb9d521415e6ef7ecc2affected
LinuxLinux4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 < 5fd30133af864a1de0a0bd87d3fe3cf23205fbc7affected
LinuxLinux4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 < 4be6cbeb93d26994bd1827ddbce391e3c4395c8faffected
LinuxLinux6.16affected
LinuxLinux0 < 6.16unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References