CVE-2026-64562
8.8 HIGHPublished 2026-08-04 · Updated 2026-08-08
AI risk analysis
- Summary
- This flaw allows an attacker to free a shadow VMCS prematurely, potentially leading to kernel memory corruption or privilege escalation.
- Exploitability
- Exploitation requires access to a virtual machine and knowledge of KVM internals; preconditions include running untrusted code on the host system.
- Blast radius
- If exploited, this could lead to severe consequences such as unauthorized access or system compromise.
- Prioritized remediation
- Update to the latest kernel version that addresses this vulnerability.
Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.
NVD description
In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Hide shadow VMCS right after VMCLEAR free_nested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loaded_vmcs_clear(), the vCPU might migrate before the pointer is cleared and __loaded_vmcs_clear() may then execute VMCLEAR. The VMCS needs to stay attached until its explicit VMCLEAR completes, but then it can be hidden and the page safely freed.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
All references
- https://git.kernel.org/stable/c/1dabef6e206568bf9d9ade74f6e56a48ea35695d
- https://git.kernel.org/stable/c/589419470030a89f16cf19300658b6dc644ca946
- https://git.kernel.org/stable/c/622ebfac01ba4f9c0060cebd41257fe46fc4a0b3
- https://git.kernel.org/stable/c/8001d2ce9d9bd09118ce523aef595aa094573ae3
- https://git.kernel.org/stable/c/af56298e9d86e6098cd1d2e155cb2949b7c45412
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.