CVE-2026-64288

Host crash via unchecked VNCR pseudo-TLB dereference

Published Jul 25, 2026 · Updated Jul 25, 2026

NULL pointer dereference in arm64 KVM nested virtualization allows local users to crash affected Linux Kernel hosts. The kvm_invalidate_vncr_va() path iterates vCPUs and blindly dereferences a missing or invalid VNCR pseudo-TLB when invalidation races with vCPU onlining. Triggering requires low-privileged local or guest OS access to an arm64 KVM host using nested virtualization, and the resulting consequence is a host-kernel crash.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in arm64 KVM nested virtualization allows local users to crash affected Linux Kernel hosts. The kvm_invalidate_vncr_va() path iterates vCPUs and blindly dereferences a missing or invalid VNCR pseudo-TLB when invalidation races with vCPU onlining. Triggering requires low-privileged local or guest OS access to an arm64 KVM host using nested virtualization, and the resulting consequence is a host-kernel crash.

The record

CVE
CVE-2026-64288
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <4be6cbeb93d26994bd1827ddbce391e3c4395c8f
  2. Affected versionversion=4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <5fd30133af864a1de0a0bd87d3fe3cf23205fbc7
  3. Affected versionversion=4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <7c73a269a880b1399baacfb9d521415e6ef7ecc2
  4. Affected versionversion=6.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <4be6cbeb93d26994bd1827ddbce391e3c4395c8f; version=4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <5fd30133af864a1de0a0bd87d3fe3cf23205fbc7; version=4ffa72ad8f37e73bbb6c0baa88557bcb4fd39929 <7c73a269a880b1399baacfb9d521415e6ef7ecc2; version=6.16

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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