Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB VNCR TLB invalidation… (CVE-2026-64288)
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-64288) in the Linux kernel affects the KVM arm64 virtualization component. The problem arises because VNCR TLB invalidation can be triggered by MMU notifiers or TLBI instructions, which may race with a vcpu not being online yet, resulting in no pseudo-TLB allocation. The function kvm_invalidate_vncr_va() did not check for allocation and could dereference a NULL pointer, causing a potential crash or undefined behavior. The resolution involved creating a new iterator that performs necessary checks before dereferencing pointers, ensuring safe invalidation operations.
Potential Impact
The vulnerability could lead to kernel crashes or instability due to NULL pointer dereference in the KVM arm64 virtualization code. This may affect system reliability and availability on affected Linux kernel versions running on arm64 architectures with KVM enabled. There is no indication of privilege escalation or code execution impact from the provided data.
Mitigation Recommendations
A fix is available as the vulnerability has been resolved in the Linux kernel. Users should apply the official kernel updates that include this patch. Since this is not a cloud service, remediation depends on deploying the updated kernel version. Patch status is not explicitly confirmed in the provided data; users should consult the vendor or distribution advisories for the exact fixed versions and update accordingly.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: nv: Avoid dereferencing NULL VNCR pseudo-TLB VNCR TLB invalidation… (CVE-2026-64288)
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.
CVSS v3.1
Score 5.5medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-64288) in the Linux kernel affects the KVM arm64 virtualization component. The problem arises because VNCR TLB invalidation can be triggered by MMU notifiers or TLBI instructions, which may race with a vcpu not being online yet, resulting in no pseudo-TLB allocation. The function kvm_invalidate_vncr_va() did not check for allocation and could dereference a NULL pointer, causing a potential crash or undefined behavior. The resolution involved creating a new iterator that performs necessary checks before dereferencing pointers, ensuring safe invalidation operations.
Potential Impact
The vulnerability could lead to kernel crashes or instability due to NULL pointer dereference in the KVM arm64 virtualization code. This may affect system reliability and availability on affected Linux kernel versions running on arm64 architectures with KVM enabled. There is no indication of privilege escalation or code execution impact from the provided data.
Mitigation Recommendations
A fix is available as the vulnerability has been resolved in the Linux kernel. Users should apply the official kernel updates that include this patch. Since this is not a cloud service, remediation depends on deploying the updated kernel version. Patch status is not explicitly confirmed in the provided data; users should consult the vendor or distribution advisories for the exact fixed versions and update accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-3fq6-32px-rfvq
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64288"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a65420e9c2644c7f80865f3
Added to database: 07/25/2026, 23:09:02 UTC
Last enriched: 08/15/2026, 03:14:33 UTC
Last updated: 09/07/2026, 10:52:10 UTC
Views: 38
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