FKIE_CVE-2021-47407

Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:17
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Handle SRCU initialization failure during page track init Check the return of init_srcu_struct(), which can fail due to OOM, when initializing the page track mechanism. Lack of checking leads to a NULL pointer deref found by a modified syzkaller. [Move the call towards the beginning of kvm_arch_init_vm. - Paolo]
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4Mailing List, Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfbMailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4Mailing List, Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfbMailing List, Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/include/asm/kvm_page_track.h",
            "arch/x86/kvm/mmu/page_track.c",
            "arch/x86/kvm/x86.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "deb2949417677649e2413266d7ce8c2ff73952b4",
              "status": "affected",
              "version": "0eb05bf290cfe8610d9680b49abef37febd1c38a",
              "versionType": "git"
            },
            {
              "lessThan": "4664318f73e496cd22c71b10888e75434a123e23",
              "status": "affected",
              "version": "0eb05bf290cfe8610d9680b49abef37febd1c38a",
              "versionType": "git"
            },
            {
              "lessThan": "eb7511bf9182292ef1df1082d23039e856d1ddfb",
              "status": "affected",
              "version": "0eb05bf290cfe8610d9680b49abef37febd1c38a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/x86/include/asm/kvm_page_track.h",
            "arch/x86/kvm/mmu/page_track.c",
            "arch/x86/kvm/x86.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.71",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7A97507B-D1C6-49E3-9F7E-BFCDE3EA3905",
              "versionEndExcluding": "5.10.71",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1A437B0D-8305-4C72-B691-D26986A126CF",
              "versionEndExcluding": "5.14.10",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "E46C74C6-B76B-4C94-A6A4-FD2FFF62D644",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "60134C3A-06E4-48C1-B04F-2903732A4E56",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*",
              "matchCriteriaId": "0460DA88-8FE1-46A2-9DDA-1F1ABA552E71",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Handle SRCU initialization failure during page track init\n\nCheck the return of init_srcu_struct(), which can fail due to OOM, when\ninitializing the page track mechanism.  Lack of checking leads to a NULL\npointer deref found by a modified syzkaller.\n\n[Move the call towards the beginning of kvm_arch_init_vm. - Paolo]"
    },
    {
      "lang": "es",
      "value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86: Manejar el error de inicializaci\u00f3n de SRCU durante el inicio del seguimiento de la p\u00e1gina. Verifique el retorno de init_srcu_struct(), que puede fallar debido a OOM, al inicializar el mecanismo de seguimiento de la p\u00e1gina. La falta de verificaci\u00f3n conduce a un puntero NULL deref encontrado por un syzkaller modificado. [Mueva la llamada hacia el principio de kvm_arch_init_vm. -Paolo]"
    }
  ],
  "id": "CVE-2021-47407",
  "lastModified": "2026-06-17T04:17:24.180",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47407",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-10T15:38:00.602784Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-21T15:15:26.247",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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