CVE-2026-64288 KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB

What is CVE-2026-64288?

CVE-2026-64288 is a medium-severity vulnerability in Linux kernel, published on 25 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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.

Weakness: CWE-476

Which versions are affected by CVE-2026-64288?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64288?

Apply the vendor's patch.

Is CVE-2026-64288 being exploited?

There is no known exploitation of CVE-2026-64288 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-64288, DEBIAN-CVE-2026-64288, GHSA-3fq6-32px-rfvq, ROOT-OS-UBUNTU-2204-CVE-2026-64288, UBUNTU-CVE-2026-64288.