CVE-2021-47407 (GCVE-0-2021-47407)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-05-11 13:54
VLAI
Title
KVM: x86: Handle SRCU initialization failure during page track init
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]
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:38 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 54/100 over 6633 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0eb05bf290cfe8610d9680b49abef37febd1c38a , < deb2949417677649e2413266d7ce8c2ff73952b4 (git)
Affected: 0eb05bf290cfe8610d9680b49abef37febd1c38a , < 4664318f73e496cd22c71b10888e75434a123e23 (git)
Affected: 0eb05bf290cfe8610d9680b49abef37febd1c38a , < eb7511bf9182292ef1df1082d23039e856d1ddfb (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.10.71 , ≤ 5.10.* (semver)
Unaffected: 5.14.10 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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              "dateUpdated": "2024-09-11T12:42:13.711Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "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"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.71",
                      "versionStartIncluding": "4.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.14.10",
                      "versionStartIncluding": "4.6",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15",
                      "versionStartIncluding": "4.6",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "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]"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-12-18T11:37:26.408Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/deb2949417677649e2413266d7ce8c2ff73952b4"
            },
            {
              "url": "https://git.kernel.org/stable/c/4664318f73e496cd22c71b10888e75434a123e23"
            },
            {
              "url": "https://git.kernel.org/stable/c/eb7511bf9182292ef1df1082d23039e856d1ddfb"
            }
          ],
          "title": "KVM: x86: Handle SRCU initialization failure during page track init",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47407",
        "datePublished": "2024-05-21T15:03:59.991Z",
        "dateReserved": "2024-05-21T14:58:30.817Z",
        "dateUpdated": "2025-12-18T11:37:26.408Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • 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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.