Vulnerability-Lookup

GHSA-MC77-R35G-CPMM

Vulnerability from github – Published: 2026-08-04 09:31 – Updated: 2026-08-04 09:31

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64562"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-04T07:16:31Z",
    "severity": null
  },
  "details": "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": "GHSA-mc77-r35g-cpmm",
  "modified": "2026-08-04T09:31:35Z",
  "published": "2026-08-04T09:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64562"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1dabef6e206568bf9d9ade74f6e56a48ea35695d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/589419470030a89f16cf19300658b6dc644ca946"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/622ebfac01ba4f9c0060cebd41257fe46fc4a0b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8001d2ce9d9bd09118ce523aef595aa094573ae3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af56298e9d86e6098cd1d2e155cb2949b7c45412"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-64562 (GCVE-0-2026-64562)

Vulnerability from cvelistv5 – Published: 2026-08-04 06:23 – Updated: 2026-08-04 06:23

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

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/af56298e9d86e6098…
https://git.kernel.org/stable/c/589419470030a89f1…
https://git.kernel.org/stable/c/8001d2ce9d9bd0911…
https://git.kernel.org/stable/c/1dabef6e206568bf9…
https://git.kernel.org/stable/c/622ebfac01ba4f9c0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < af56298e9d86e6098cd1d2e155cb2949b7c45412 (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 589419470030a89f16cf19300658b6dc644ca946 (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 8001d2ce9d9bd09118ce523aef595aa094573ae3 (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 1dabef6e206568bf9d9ade74f6e56a48ea35695d (git) Affected: 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 , < 622ebfac01ba4f9c0060cebd41257fe46fc4a0b3 (git)
Linux	Linux	Affected: 4.9 Unaffected: 0 , < 4.9 (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-rc5 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "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": "af56298e9d86e6098cd1d2e155cb2949b7c45412",
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "versionType": "git"
            },
            {
              "lessThan": "589419470030a89f16cf19300658b6dc644ca946",
              "status": "affected",
              "version": "355f4fb1405ec29d0fac49b4d41fcd78cbd455d5",
              "versionType": "git"
            },
            {
              "lessThan": "8001d2ce9d9bd09118ce523aef595aa094573ae3",
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              "versionType": "git"
            },
            {
              "lessThan": "1dabef6e206568bf9d9ade74f6e56a48ea35695d",
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              "versionType": "git"
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            {
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              "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"
            },
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              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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      "descriptions": [
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-04T06:23:21.855Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/af56298e9d86e6098cd1d2e155cb2949b7c45412"
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        },
        {
          "url": "https://git.kernel.org/stable/c/622ebfac01ba4f9c0060cebd41257fe46fc4a0b3"
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      ],
      "title": "KVM: nVMX: Hide shadow VMCS right after VMCLEAR",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64562",
    "datePublished": "2026-08-04T06:23:21.855Z",
    "dateReserved": "2026-07-19T15:36:31.796Z",
    "dateUpdated": "2026-08-04T06:23:21.855Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

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.

Action not permitted

GHSA-MC77-R35G-CPMM

CVE-2026-64562 (GCVE-0-2026-64562)

Tags

Sightings

Nomenclature