CVE-2021-46950 (GCVE-0-2021-46950)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:40 – Updated: 2026-05-23 15:18
VLAI
Title
md/raid1: properly indicate failure when ending a failed write request
Summary
In the Linux kernel, the following vulnerability has been resolved: md/raid1: properly indicate failure when ending a failed write request This patch addresses a data corruption bug in raid1 arrays using bitmaps. Without this fix, the bitmap bits for the failed I/O end up being cleared. Since we are in the failure leg of raid1_end_write_request, the request either needs to be retried (R1BIO_WriteError) or failed (R1BIO_Degraded).
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-22 16:05 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 900c531899f5ee2321bef79e20055787bc73251d , < 12216d0919b64ee2ea5dc7a50e455670f44383d5 (git)
Affected: 1cd972e0a10760a1fa27d9830d78446c891c23b6 , < a6e17cab00fc5bf85472434c52ac751426257c6f (git)
Affected: eeba6809d8d58908b5ed1b5ceb5fcb09a98a7cad , < 6920cef604fa57f9409e3960413e9cc11f5c5a40 (git)
Affected: eeba6809d8d58908b5ed1b5ceb5fcb09a98a7cad , < 661061a45e32d8b2cc0e306da9f169ad44011382 (git)
Affected: eeba6809d8d58908b5ed1b5ceb5fcb09a98a7cad , < 59452e551784b7a57a45d971727e9db63b192515 (git)
Affected: eeba6809d8d58908b5ed1b5ceb5fcb09a98a7cad , < 538244fba59fde17186322776247cd9c05be86dd (git)
Affected: eeba6809d8d58908b5ed1b5ceb5fcb09a98a7cad , < 2417b9869b81882ab90fd5ed1081a1cb2d4db1dd (git)
Affected: a1f4fcb880988a96c0b2d5c3305ffc4e49eca0ed (git)
Affected: 344242d50f468a250bf4b6136934392758412ed8 (git)
Affected: 4.14.147 , < 4.14.233 (semver)
Affected: 4.19.77 , < 4.19.191 (semver)
Affected: 5.2.19 , < 5.3 (semver)
Affected: 5.3.4 , < 5.4 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.118 , ≤ 5.4.* (semver)
Unaffected: 5.10.36 , ≤ 5.10.* (semver)
Unaffected: 5.11.20 , ≤ 5.11.* (semver)
Unaffected: 5.12.3 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                  "lessThan": "538244fba59fde17186322776247cd9c05be86dd",
                  "status": "affected",
                  "version": "eeba6809d8d58908b5ed1b5ceb5fcb09a98a7cad",
                  "versionType": "git"
                },
                {
                  "lessThan": "2417b9869b81882ab90fd5ed1081a1cb2d4db1dd",
                  "status": "affected",
                  "version": "eeba6809d8d58908b5ed1b5ceb5fcb09a98a7cad",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "a1f4fcb880988a96c0b2d5c3305ffc4e49eca0ed",
                  "versionType": "git"
                },
                {
                  "status": "affected",
                  "version": "344242d50f468a250bf4b6136934392758412ed8",
                  "versionType": "git"
                },
                {
                  "lessThan": "4.14.233",
                  "status": "affected",
                  "version": "4.14.147",
                  "versionType": "semver"
                },
                {
                  "lessThan": "4.19.191",
                  "status": "affected",
                  "version": "4.19.77",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.3",
                  "status": "affected",
                  "version": "5.2.19",
                  "versionType": "semver"
                },
                {
                  "lessThan": "5.4",
                  "status": "affected",
                  "version": "5.3.4",
                  "versionType": "semver"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/md/raid1.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.4"
                },
                {
                  "lessThan": "5.4",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.233",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.191",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.118",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.36",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.11.*",
                  "status": "unaffected",
                  "version": "5.11.20",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.12.*",
                  "status": "unaffected",
                  "version": "5.12.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.233",
                      "versionStartIncluding": "4.14.147",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.191",
                      "versionStartIncluding": "4.19.77",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.118",
                      "versionStartIncluding": "5.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.36",
                      "versionStartIncluding": "5.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.11.20",
                      "versionStartIncluding": "5.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.12.3",
                      "versionStartIncluding": "5.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.13",
                      "versionStartIncluding": "5.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "5.2.19",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "5.3.4",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid1: properly indicate failure when ending a failed write request\n\nThis patch addresses a data corruption bug in raid1 arrays using bitmaps.\nWithout this fix, the bitmap bits for the failed I/O end up being cleared.\n\nSince we are in the failure leg of raid1_end_write_request, the request\neither needs to be retried (R1BIO_WriteError) or failed (R1BIO_Degraded)."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-23T15:18:44.268Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/12216d0919b64ee2ea5dc7a50e455670f44383d5"
            },
            {
              "url": "https://git.kernel.org/stable/c/a6e17cab00fc5bf85472434c52ac751426257c6f"
            },
            {
              "url": "https://git.kernel.org/stable/c/6920cef604fa57f9409e3960413e9cc11f5c5a40"
            },
            {
              "url": "https://git.kernel.org/stable/c/661061a45e32d8b2cc0e306da9f169ad44011382"
            },
            {
              "url": "https://git.kernel.org/stable/c/59452e551784b7a57a45d971727e9db63b192515"
            },
            {
              "url": "https://git.kernel.org/stable/c/538244fba59fde17186322776247cd9c05be86dd"
            },
            {
              "url": "https://git.kernel.org/stable/c/2417b9869b81882ab90fd5ed1081a1cb2d4db1dd"
            }
          ],
          "title": "md/raid1: properly indicate failure when ending a failed write request",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-46950",
        "datePublished": "2024-02-27T18:40:34.106Z",
        "dateReserved": "2024-02-25T13:45:52.722Z",
        "dateUpdated": "2026-05-23T15:18:44.268Z",
        "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

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.



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.