{"id":"CVE-2026-64562","published":"2026-08-04T07:16:31.093","lastModified":"2026-08-08T15:16:31.307","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: nVMX: Hide shadow VMCS right after VMCLEAR\n\nfree_nested() frees the shadow VMCS while vmcs01 still points to it. But\nbecause it is asynchronous with respect to loaded_vmcs_clear(), the vCPU\nmight migrate before the pointer is cleared and __loaded_vmcs_clear()\nmay then execute VMCLEAR.\n\nThe VMCS needs to stay attached until its explicit VMCLEAR completes, but\nthen it can be hidden and the page safely freed.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/1dabef6e206568bf9d9ade74f6e56a48ea35695d","tags":[]},{"url":"https://git.kernel.org/stable/c/589419470030a89f16cf19300658b6dc644ca946","tags":[]},{"url":"https://git.kernel.org/stable/c/622ebfac01ba4f9c0060cebd41257fe46fc4a0b3","tags":[]},{"url":"https://git.kernel.org/stable/c/8001d2ce9d9bd09118ce523aef595aa094573ae3","tags":[]},{"url":"https://git.kernel.org/stable/c/af56298e9d86e6098cd1d2e155cb2949b7c45412","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"This vulnerability allows an attacker to potentially free a shadow VMCS prematurely, leading to a race condition that could result in the kernel memory being freed while the vCPU is still using it, potentially leading to a denial of service or other kernel-level issues.","exploitability":"Exploitation requires an attacker to have the ability to trigger a vCPU migration while the VMCS is being freed, which is considered moderately difficult and requires specific conditions to be met.","blast_radius":"If exploited, the impact is likely to be limited to the specific virtual machine experiencing the issue, potentially leading to a denial of service or kernel panic, but not affecting other systems directly.","remediation":"Upgrade to the fixed version 6.1.11 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["dos","vm","kvm","kernel"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-30T09:24:32.388Z"}}