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
Not known to be exploited · fixed in ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a : update Linux kernel when convenient.
Data as of 6 Nov 2026, 18:18 UTC
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
Disclosed: evidence found.
CVE published 6 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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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
- git.kernel.org/stable/c/c7cd3605244c924249dea32632e1bc3e89bda543 (opens in a new tab)
- git.kernel.org/stable/c/9a21f1defd96c6301c5fb462a78eb51b191bd2dd (opens in a new tab)
- git.kernel.org/stable/c/570af5db081b87374594a00711ac5760d2ea6844 (opens in a new tab)
- git.kernel.org/stable/c/ffaaff82336db84e9b58e7a3e81c2fd64e05ed7a (opens in a new tab)
- git.kernel.org/stable/c/258ec63c0f281bf7b50f9de67c8e93b5b7be5ed4 (opens in a new tab)
- git.kernel.org/stable/c/3dcfb04dd43b16fa1240fc6487fff578ad57264c (opens in a new tab)
- git.kernel.org/stable/c/db8407b9fd06d857a4a5e8bcff1d086d13007711 (opens in a new tab)
- git.kernel.org/stable/c/7ef78d71ca713d8c00f7c34ddcf276c808143f77 (opens in a new tab)