CVE-2026-64285 (GCVE-0-2026-64285)
Vulnerability from cvelistv5
Published
2026-07-25 08:49
Modified
2026-08-17 04:52
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Pin source page for write when adding CPUID data for SNP guest When populating a guest_memfd instance with the initial CPUID data for an SNP guest, acquire a writable pin on the source page as KVM will write back the "correct" CPUID information if the userspace provided data is rejected by trusted firmware. Because KVM writes to the source page using a kernel mapping, pinning for read could result in KVM clobbering read-only memory. Note, well-behaved VMMs are unlikely to be affected, as CPUID information is almost always dynamically generated by userspace, i.e. it's unlikely for the CPUID information to be backed by a read-only mapping. [sean: rewrite shortlog and changelog, tag for stable@]
References
Impacted products
Vendor Product Version
Linux Linux Version: 2a62345b30529e488beb6a1220577b3495933724
Version: 2a62345b30529e488beb6a1220577b3495933724
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c",
            "arch/x86/kvm/vmx/tdx.c",
            "include/linux/kvm_host.h",
            "virt/kvm/guest_memfd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dcdb476f5fc5701ec06c23efe3e3529f07ca391e",
              "status": "affected",
              "version": "2a62345b30529e488beb6a1220577b3495933724",
              "versionType": "git"
            },
            {
              "lessThan": "f13e900599089b10113ceb36013423f0837c6792",
              "status": "affected",
              "version": "2a62345b30529e488beb6a1220577b3495933724",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c",
            "arch/x86/kvm/vmx/tdx.c",
            "include/linux/kvm_host.h",
            "virt/kvm/guest_memfd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "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": "7.1.4",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "7.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SEV: Pin source page for write when adding CPUID data for SNP guest\n\nWhen populating a guest_memfd instance with the initial CPUID data for an\nSNP guest, acquire a writable pin on the source page as KVM will write back\nthe \"correct\" CPUID information if the userspace provided data is rejected\nby trusted firmware.  Because KVM writes to the source page using a kernel\nmapping, pinning for read could result in KVM clobbering read-only memory.\n\nNote, well-behaved VMMs are unlikely to be affected, as CPUID information\nis almost always dynamically generated by userspace, i.e. it\u0027s unlikely for\nthe CPUID information to be backed by a read-only mapping.\n\n[sean: rewrite shortlog and changelog, tag for stable@]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T04:52:40.907Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/dcdb476f5fc5701ec06c23efe3e3529f07ca391e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f13e900599089b10113ceb36013423f0837c6792"
        }
      ],
      "title": "KVM: SEV: Pin source page for write when adding CPUID data for SNP guest",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64285",
    "datePublished": "2026-07-25T08:49:26.898Z",
    "dateReserved": "2026-07-19T15:36:31.777Z",
    "dateUpdated": "2026-08-17T04:52:40.907Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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