CVE-2026-64562 (GCVE-0-2026-64562)
Vulnerability from cvelistv5 – Published: 2026-08-04 06:23 – Updated: 2026-10-19 20:48
VLAI
EPSS
VEX
Title
KVM: nVMX: Hide shadow VMCS right after VMCLEAR
Summary
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.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:42 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < b82c3144d8264265448292ca406f60bafeba3b6f
(git)
Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 4f50e6aec16f69627dbad5704d1e90a255d766a7 (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < dc3eecfa219ebc9d01eaf7d1abd1441efe884dab (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < af56298e9d86e6098cd1d2e155cb2949b7c45412 (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 589419470030a89f16cf19300658b6dc644ca946 (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 8001d2ce9d9bd09118ce523aef595aa094573ae3 (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 1dabef6e206568bf9d9ade74f6e56a48ea35695d (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 622ebfac01ba4f9c0060cebd41257fe46fc4a0b3 (git) |
guessed | |
| Linux | Linux |
Affected:
4.9
Unaffected: 0 , < 4.9 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.148 , ≤ 6.6.* (semver) Unaffected: 6.12.101 , ≤ 6.12.* (semver) Unaffected: 6.18.42 , ≤ 6.18.* (semver) Unaffected: 7.1.6 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"status": "final",
"title": "kernel: KVM: nVMX: Hide shadow VMCS right after VMCLEAR",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64562.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-64562",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:42:52.528075Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-16T15:42:53.129Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"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": "b82c3144d8264265448292ca406f60bafeba3b6f",
"status": "affected",
"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
"versionType": "git"
},
{
"lessThan": "4f50e6aec16f69627dbad5704d1e90a255d766a7",
"status": "affected",
"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
"versionType": "git"
},
{
"lessThan": "dc3eecfa219ebc9d01eaf7d1abd1441efe884dab",
"status": "affected",
"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
"versionType": "git"
},
{
"lessThan": "af56298e9d86e6098cd1d2e155cb2949b7c45412",
"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
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},
{
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"status": "affected",
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"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"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": "5.10.*",
"status": "unaffected",
"version": "5.10.265",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.183",
"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",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.265",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.216",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.183",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.148",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "4.9",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
"version": "3.1"
},
"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."
}
]
}
],
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"dateUpdated": "2026-08-19T16:28:32.954Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/b82c3144d8264265448292ca406f60bafeba3b6f"
},
{
"url": "https://git.kernel.org/stable/c/4f50e6aec16f69627dbad5704d1e90a255d766a7"
},
{
"url": "https://git.kernel.org/stable/c/dc3eecfa219ebc9d01eaf7d1abd1441efe884dab"
},
{
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-64562",
"datePublished": "2026-08-04T06:23:21.855Z",
"dateReserved": "2026-07-19T15:36:31.796Z",
"dateUpdated": "2026-10-19T20:48:41.796Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.