{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-64562", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T15:36:31.796Z", "datePublished": "2026-08-04T06:23:21.855Z", "dateUpdated": "2026-08-08T15:13:03.997Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-08T15:13:03.997Z"}, "descriptions": [{"lang": "en", "value": "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached through local KVM nested VMX: open /dev/kvm, run a nested guest, then tear down nested state (VMXOFF/handle_vmxoff or vmx_leave_nested). It is not reachable via network or adjacent-radio packets.\nAC:L - A KVM VMM attacker controls both sides of the race by driving nested teardown (VMXOFF/vcpu destroy) while forcing vCPU migration via thread affinity/scheduling so __loaded_vmcs_clear() VMCLEARs the dangling shadow VMCS pointer.\nPR:L - Exploitation needs permission to use /dev/kvm and nested VMX (commonly kvm-group or equivalent), not real init-namespace root; KVM create/run ioctls have no CAP_SYS_ADMIN gate on this path.\nUI:N - After the attacker has KVM/nested access, they trigger free_nested and migration themselves; no separate victim action is required.\nS:C - free_nested runs in host KVM while handling L1 nested VMX teardown, and the UAF corrupts host kernel memory, crossing the guest/hypervisor isolation boundary (guest-to-host escape class).\nC:H - The dangling shadow VMCS pointer lets VMCLEAR operate on a freed page that may be reused, yielding a host kernel use-after-free that can be leveraged for arbitrary information disclosure.\nI:H - VMCLEAR writes VMCS state into the freed page; with page reuse this is host heap corruption enabling write primitives and potential host code execution, consistent with UAF guidance.\nA:H - Use-after-free of the shadow VMCS page can oops/panic the host kernel when VMCLEAR or later accessors touch reallocated memory, fully denying host availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/vmx/nested.c"], "versions": [{"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "lessThan": "af56298e9d86e6098cd1d2e155cb2949b7c45412", "status": "affected", "versionType": "git"}, {"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "lessThan": "589419470030a89f16cf19300658b6dc644ca946", "status": "affected", "versionType": "git"}, {"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "lessThan": "8001d2ce9d9bd09118ce523aef595aa094573ae3", "status": "affected", "versionType": "git"}, {"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "lessThan": "1dabef6e206568bf9d9ade74f6e56a48ea35695d", "status": "affected", "versionType": "git"}, {"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "lessThan": "622ebfac01ba4f9c0060cebd41257fe46fc4a0b3", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["arch/x86/kvm/vmx/nested.c"], "versions": [{"version": "4.9", "status": "affected"}, {"version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2-rc5", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.2-rc5"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/af56298e9d86e6098cd1d2e155cb2949b7c45412"}, {"url": "https://git.kernel.org/stable/c/589419470030a89f16cf19300658b6dc644ca946"}, {"url": "https://git.kernel.org/stable/c/8001d2ce9d9bd09118ce523aef595aa094573ae3"}, {"url": "https://git.kernel.org/stable/c/1dabef6e206568bf9d9ade74f6e56a48ea35695d"}, {"url": "https://git.kernel.org/stable/c/622ebfac01ba4f9c0060cebd41257fe46fc4a0b3"}], "title": "KVM: nVMX: Hide shadow VMCS right after VMCLEAR", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["arch/x86/kvm/vmx/nested.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "af56298e9d86e6098cd1d2e155cb2949b7c45412", "status": "affected", "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "versionType": "git"}, {"lessThan": "589419470030a89f16cf19300658b6dc644ca946", "status": "affected", "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "versionType": "git"}, {"lessThan": "8001d2ce9d9bd09118ce523aef595aa094573ae3", "status": "affected", "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "versionType": "git"}, {"lessThan": "1dabef6e206568bf9d9ade74f6e56a48ea35695d", "status": "affected", "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "versionType": "git"}, {"lessThan": "622ebfac01ba4f9c0060cebd41257fe46fc4a0b3", "status": "affected", "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["arch/x86/kvm/vmx/nested.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.9"}, {"lessThan": "4.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.101", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc5", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-64562", "lastModified": "2026-08-08T15:16:31.307", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 6.0, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-04T07:16:31.093", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1dabef6e206568bf9d9ade74f6e56a48ea35695d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/589419470030a89f16cf19300658b6dc644ca946"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/622ebfac01ba4f9c0060cebd41257fe46fc4a0b3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8001d2ce9d9bd09118ce523aef595aa094573ae3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/af56298e9d86e6098cd1d2e155cb2949b7c45412"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[355f4fb1405ec29d0fac49b4d41fcd78cbd455d5,af56298e9d86e6098cd1d2e155cb2949b7c45412)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[355f4fb1405ec29d0fac49b4d41fcd78cbd455d5,589419470030a89f16cf19300658b6dc644ca946)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[355f4fb1405ec29d0fac49b4d41fcd78cbd455d5,8001d2ce9d9bd09118ce523aef595aa094573ae3)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[355f4fb1405ec29d0fac49b4d41fcd78cbd455d5,1dabef6e206568bf9d9ade74f6e56a48ea35695d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[355f4fb1405ec29d0fac49b4d41fcd78cbd455d5,622ebfac01ba4f9c0060cebd41257fe46fc4a0b3)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc5,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-04T08:45:05.898215+00:00", "updated": "2026-08-08T18:30:03.345249+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-469"]}