Vulnerability-Lookup

GHSA-8RJP-WMFG-59V9

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31

Details

In the Linux kernel, the following vulnerability has been resolved:

virt: sev-guest: Explicitly leak pages in unknown state

When set_memory_{encrypted,decrypted}() fail, the user cannot know at which point the function failed, meaning that the pages are left in an unknown state from the point of view of the caller.

Since the pages may be left in an unencrypted state, they are not suitable for general use, and cannot be returned safely to the buddy allocator. Avoid the issue by never freeing the pages, and then do the proper accounting by calling snp_leak_pages().

Severity

8.7 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64104"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:51Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirt: sev-guest: Explicitly leak pages in unknown state\n\nWhen set_memory_{encrypted,decrypted}() fail, the user cannot know at which\npoint the function failed, meaning that the pages are left in an unknown state\nfrom the point of view of the caller.\n\nSince the pages may be left in an unencrypted state, they are not suitable for\ngeneral use, and cannot be returned safely to the buddy allocator. Avoid the\nissue by never freeing the pages, and then do the proper accounting by calling\nsnp_leak_pages().",
  "id": "GHSA-8rjp-wmfg-59v9",
  "modified": "2026-07-20T15:31:59Z",
  "published": "2026-07-19T18:31:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64104"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3d0cd0065deeb054b4b29236432e851806b7cc81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bee400ad4f4259c9c0758e4f1960a1eed6f6f9f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fd948c3f96b18ff9ba7d3e8eae13d196593e1aaf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-64104 (GCVE-0-2026-64104)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-20 13:43

Title

virt: sev-guest: Explicitly leak pages in unknown state

Summary

In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Explicitly leak pages in unknown state When set_memory_{encrypted,decrypted}() fail, the user cannot know at which point the function failed, meaning that the pages are left in an unknown state from the point of view of the caller. Since the pages may be left in an unencrypted state, they are not suitable for general use, and cannot be returned safely to the buddy allocator. Avoid the issue by never freeing the pages, and then do the proper accounting by calling snp_leak_pages().

Severity

8.7 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/bee400ad4f4259c9c…
https://git.kernel.org/stable/c/3d0cd0065deeb054b…
https://git.kernel.org/stable/c/fd948c3f96b18ff9b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3e385c0d6ce88ac9916dcf84267bd5855d830748 , < bee400ad4f4259c9c0758e4f1960a1eed6f6f9f0 (git) Affected: 3e385c0d6ce88ac9916dcf84267bd5855d830748 , < 3d0cd0065deeb054b4b29236432e851806b7cc81 (git) Affected: 3e385c0d6ce88ac9916dcf84267bd5855d830748 , < fd948c3f96b18ff9ba7d3e8eae13d196593e1aaf (git) Affected: 0b16521f95c875e79d657cb8d6911c15080dbb80 (git) Affected: 6.13.8 , < 6.14 (semver)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.34 , ≤ 6.18.* (semver) Unaffected: 7.0.11 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/virt/coco/sev-guest/sev-guest.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bee400ad4f4259c9c0758e4f1960a1eed6f6f9f0",
              "status": "affected",
              "version": "3e385c0d6ce88ac9916dcf84267bd5855d830748",
              "versionType": "git"
            },
            {
              "lessThan": "3d0cd0065deeb054b4b29236432e851806b7cc81",
              "status": "affected",
              "version": "3e385c0d6ce88ac9916dcf84267bd5855d830748",
              "versionType": "git"
            },
            {
              "lessThan": "fd948c3f96b18ff9ba7d3e8eae13d196593e1aaf",
              "status": "affected",
              "version": "3e385c0d6ce88ac9916dcf84267bd5855d830748",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0b16521f95c875e79d657cb8d6911c15080dbb80",
              "versionType": "git"
            },
            {
              "lessThan": "6.14",
              "status": "affected",
              "version": "6.13.8",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/virt/coco/sev-guest/sev-guest.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.34",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.34",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.11",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.13.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvirt: sev-guest: Explicitly leak pages in unknown state\n\nWhen set_memory_{encrypted,decrypted}() fail, the user cannot know at which\npoint the function failed, meaning that the pages are left in an unknown state\nfrom the point of view of the caller.\n\nSince the pages may be left in an unencrypted state, they are not suitable for\ngeneral use, and cannot be returned safely to the buddy allocator. Avoid the\nissue by never freeing the pages, and then do the proper accounting by calling\nsnp_leak_pages()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:43:21.343Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bee400ad4f4259c9c0758e4f1960a1eed6f6f9f0"
        },
        {
          "url": "https://git.kernel.org/stable/c/3d0cd0065deeb054b4b29236432e851806b7cc81"
        },
        {
          "url": "https://git.kernel.org/stable/c/fd948c3f96b18ff9ba7d3e8eae13d196593e1aaf"
        }
      ],
      "title": "virt: sev-guest: Explicitly leak pages in unknown state",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64104",
    "datePublished": "2026-07-19T15:40:07.994Z",
    "dateReserved": "2026-07-19T07:54:57.034Z",
    "dateUpdated": "2026-07-20T13:43:21.343Z",
    "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.

Action not permitted

GHSA-8RJP-WMFG-59V9

CVE-2026-64104 (GCVE-0-2026-64104)

Tags

Sightings

Nomenclature