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VulnerabilityPublished Updated

CVE-2026-64604: Linux kernel · KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a : update Linux kernel when convenient.

Data as of 6 Nov 2026, 18:18 UTC

Severity
Low

Rated Low by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none
CISA SSVC
Exploitation
No evidence of active exploitation and no public proof of concept
Automatable
Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact
Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch
Available – fixed in ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a, db8407b9fd06d857a4a5e8bcff1d086d13007711, c7cd3605244c924249dea32632e1bc3e89bda543 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Aug 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ a7c0b07d570848e50fce4d31ac01313484d6b844, < ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a
Fixed in
  • ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a
LinuxLinuxAffected
  • ≥ a7c0b07d570848e50fce4d31ac01313484d6b844, < db8407b9fd06d857a4a5e8bcff1d086d13007711
Fixed in
  • db8407b9fd06d857a4a5e8bcff1d086d13007711
LinuxLinuxAffected
  • ≥ a7c0b07d570848e50fce4d31ac01313484d6b844, < c7cd3605244c924249dea32632e1bc3e89bda543
Fixed in
  • c7cd3605244c924249dea32632e1bc3e89bda543
LinuxLinuxAffected
  • ≥ a7c0b07d570848e50fce4d31ac01313484d6b844, < 570af5db081b87374594a00711ac5760d2ea6844
Fixed in
  • 570af5db081b87374594a00711ac5760d2ea6844
LinuxLinuxAffected
  • ≥ a7c0b07d570848e50fce4d31ac01313484d6b844, < 258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4
Fixed in
  • 258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4
LinuxLinuxAffected
  • ≥ a7c0b07d570848e50fce4d31ac01313484d6b844, < 9a21f1defd96c6301c5fb462a78eb51b191bd2dd
Fixed in
  • 9a21f1defd96c6301c5fb462a78eb51b191bd2dd

AI-suggested

A fix is available and has been applied in the Linux kernel. Users should update to the fixed kernel versions to resolve the issue. No additional mitigation actions are necessary as this is not a functional security flaw but a correctness fix.

Description

A vulnerability in the Linux kernel's KVM VMX module related to updating CR8 intercepts has been resolved. The fix ensures vmcs12 is grabbed only when the vCPU is in guest mode, preventing lockdep assertion failures during vCPU creation. This change addresses a kernel warning and does not introduce functional changes.

References

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