What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-08-17
• Weakness: CWE-476

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.

Affected products

• Linux kernel: from 6.16 before 6.18.39; from 6.19 before 7.1.4 — fixed in 6.18.39, 7.1.4

How to fix

Upgrade to a fixed version: Linux kernel 6.18.39, 7.1.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/4be6cbeb93d26994bd1827ddbce391e3c4395c8f
• https://git.kernel.org/stable/c/5fd30133af864a1de0a0bd87d3fe3cf23205fbc7
• https://git.kernel.org/stable/c/7c73a269a880b1399baacfb9d521415e6ef7ecc2

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