Vulnerability-Lookup

GHSA-78RG-CJ9J-75RJ

Vulnerability from github – Published: 2026-01-22 21:33 – Updated: 2026-01-22 21:33

Details

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

KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak

For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.

Severity ?

7.1 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49556"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-02-26T07:01:31Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak\n\nFor some sev ioctl interfaces, the length parameter that is passed maybe\nless than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data\nthat PSP firmware returns. In this case, kmalloc will allocate memory\nthat is the size of the input rather than the size of the data.\nSince PSP firmware doesn\u0027t fully overwrite the allocated buffer, these\nsev ioctl interface may return uninitialized kernel slab memory.",
  "id": "GHSA-78rg-cj9j-75rj",
  "modified": "2026-01-22T21:33:40Z",
  "published": "2026-01-22T21:33:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49556"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49556 (GCVE-0-2022-49556)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:14 – Updated: 2025-05-04 08:40

Title

KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/401bef1f95de92c3a…
	https://git.kernel.org/stable/c/d8fdb4b24097472ff…
	https://git.kernel.org/stable/c/bbdcc644b59e01e98…
	https://git.kernel.org/stable/c/57a01725339f9d82b…
	https://git.kernel.org/stable/c/d22d2474e3953996f…

Impacted products

Vendor

Product

Version

Linux

Affected: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 , < 401bef1f95de92c3a8c6eece46e02fa88d7285ee (git)
Affected: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 , < d8fdb4b24097472ff6b3c0559448200d420b1418 (git)
Affected: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 , < bbdcc644b59e01e98c68894a9fab42b9687f42b0 (git)
Affected: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 , < 57a01725339f9d82b099102ba2751621b1caab93 (git)
Affected: eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5 , < d22d2474e3953996f03528b84b7f52cc26a39403 (git)

Linux

Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.124 , ≤ 5.10.* (semver)
Unaffected: 5.15.45 , ≤ 5.15.* (semver)
Unaffected: 5.17.13 , ≤ 5.17.* (semver)
Unaffected: 5.18.2 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "401bef1f95de92c3a8c6eece46e02fa88d7285ee",
              "status": "affected",
              "version": "eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5",
              "versionType": "git"
            },
            {
              "lessThan": "d8fdb4b24097472ff6b3c0559448200d420b1418",
              "status": "affected",
              "version": "eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5",
              "versionType": "git"
            },
            {
              "lessThan": "bbdcc644b59e01e98c68894a9fab42b9687f42b0",
              "status": "affected",
              "version": "eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5",
              "versionType": "git"
            },
            {
              "lessThan": "57a01725339f9d82b099102ba2751621b1caab93",
              "status": "affected",
              "version": "eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5",
              "versionType": "git"
            },
            {
              "lessThan": "d22d2474e3953996f03528b84b7f52cc26a39403",
              "status": "affected",
              "version": "eaf78265a4ab33935d3a0f1407ce4a91aac4d4d5",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/kvm/svm/sev.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.7"
            },
            {
              "lessThan": "5.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.124",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.17.*",
              "status": "unaffected",
              "version": "5.17.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.124",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.45",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17.13",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.18.2",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19",
                  "versionStartIncluding": "5.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak\n\nFor some sev ioctl interfaces, the length parameter that is passed maybe\nless than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data\nthat PSP firmware returns. In this case, kmalloc will allocate memory\nthat is the size of the input rather than the size of the data.\nSince PSP firmware doesn\u0027t fully overwrite the allocated buffer, these\nsev ioctl interface may return uninitialized kernel slab memory."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:40:28.652Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418"
        },
        {
          "url": "https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93"
        },
        {
          "url": "https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403"
        }
      ],
      "title": "KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49556",
    "datePublished": "2025-02-26T02:14:03.630Z",
    "dateReserved": "2025-02-26T02:08:31.590Z",
    "dateUpdated": "2025-05-04T08:40:28.652Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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-78RG-CJ9J-75RJ

CVE-2022-49556 (GCVE-0-2022-49556)

Tags

Sightings

Nomenclature