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CVE-2021-47321 (GCVE-0-2021-47321)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-05-11 13:52
VLAI
Title
watchdog: Fix possible use-after-free by calling del_timer_sync()
Summary
In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free by calling del_timer_sync() This driver's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself.
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 15:39 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < 58606882ad8ec6c39e0f40344b922921ef94ab4d (git)
Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < ca96b8ea5e74956071154bdb456778cc3027e79f (git)
Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < 8bec568d7518b1504a602ed5376bb322e4dbb270 (git)
Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < ecd620e0fb1ff7f78fdb593379b2e6938c99707a (git)
Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < db222f1477ad5692cd454709b714949807e5d111 (git)
Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < 66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4 (git)
Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < 4c05dac488a660fe2925c047ecb119e7afaaeb1e (git)
Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < 1a053c4d716898a53c2e31c574a70ea0c37044a3 (git)
Affected: 7c25f8c9f67708e6464d2221bc311cbd99e950dc , < d0212f095ab56672f6f36aabc605bda205e1e0bf (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.3
Unaffected: 0 , < 4.3 (semver)
Unaffected: 4.4.276 , ≤ 4.4.* (semver)
Unaffected: 4.9.276 , ≤ 4.9.* (semver)
Unaffected: 4.14.240 , ≤ 4.14.* (semver)
Unaffected: 4.19.198 , ≤ 4.19.* (semver)
Unaffected: 5.4.134 , ≤ 5.4.* (semver)
Unaffected: 5.10.52 , ≤ 5.10.* (semver)
Unaffected: 5.12.19 , ≤ 5.12.* (semver)
Unaffected: 5.13.4 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:39:06.038849Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:13.900Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/watchdog/lpc18xx_wdt.c",
                "drivers/watchdog/w83877f_wdt.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "58606882ad8ec6c39e0f40344b922921ef94ab4d",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                },
                {
                  "lessThan": "ca96b8ea5e74956071154bdb456778cc3027e79f",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                },
                {
                  "lessThan": "8bec568d7518b1504a602ed5376bb322e4dbb270",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                },
                {
                  "lessThan": "ecd620e0fb1ff7f78fdb593379b2e6938c99707a",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                },
                {
                  "lessThan": "db222f1477ad5692cd454709b714949807e5d111",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                },
                {
                  "lessThan": "66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                },
                {
                  "lessThan": "4c05dac488a660fe2925c047ecb119e7afaaeb1e",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                },
                {
                  "lessThan": "1a053c4d716898a53c2e31c574a70ea0c37044a3",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                },
                {
                  "lessThan": "d0212f095ab56672f6f36aabc605bda205e1e0bf",
                  "status": "affected",
                  "version": "7c25f8c9f67708e6464d2221bc311cbd99e950dc",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/watchdog/lpc18xx_wdt.c",
                "drivers/watchdog/w83877f_wdt.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.3"
                },
                {
                  "lessThan": "4.3",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.4.*",
                  "status": "unaffected",
                  "version": "4.4.276",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.276",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.240",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.198",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.134",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.52",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.12.*",
                  "status": "unaffected",
                  "version": "5.12.19",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.13.*",
                  "status": "unaffected",
                  "version": "5.13.4",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.14",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.4.276",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.276",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.240",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.198",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.134",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.52",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.12.19",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.13.4",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.14",
                      "versionStartIncluding": "4.3",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatchdog: Fix possible use-after-free by calling del_timer_sync()\n\nThis driver\u0027s remove path calls del_timer(). However, that function\ndoes not wait until the timer handler finishes. This means that the\ntimer handler may still be running after the driver\u0027s remove function\nhas finished, which would result in a use-after-free.\n\nFix by calling del_timer_sync(), which makes sure the timer handler\nhas finished, and unable to re-schedule itself."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-12-18T11:36:36.710Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/58606882ad8ec6c39e0f40344b922921ef94ab4d"
            },
            {
              "url": "https://git.kernel.org/stable/c/ca96b8ea5e74956071154bdb456778cc3027e79f"
            },
            {
              "url": "https://git.kernel.org/stable/c/8bec568d7518b1504a602ed5376bb322e4dbb270"
            },
            {
              "url": "https://git.kernel.org/stable/c/ecd620e0fb1ff7f78fdb593379b2e6938c99707a"
            },
            {
              "url": "https://git.kernel.org/stable/c/db222f1477ad5692cd454709b714949807e5d111"
            },
            {
              "url": "https://git.kernel.org/stable/c/66ba9cf929b1c4fabf545bd4c18f6f64e23e46e4"
            },
            {
              "url": "https://git.kernel.org/stable/c/4c05dac488a660fe2925c047ecb119e7afaaeb1e"
            },
            {
              "url": "https://git.kernel.org/stable/c/1a053c4d716898a53c2e31c574a70ea0c37044a3"
            },
            {
              "url": "https://git.kernel.org/stable/c/d0212f095ab56672f6f36aabc605bda205e1e0bf"
            }
          ],
          "title": "watchdog: Fix possible use-after-free by calling del_timer_sync()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47321",
        "datePublished": "2024-05-21T14:35:35.877Z",
        "dateReserved": "2024-05-21T14:28:16.974Z",
        "dateUpdated": "2025-12-18T11:36:36.710Z",
        "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.


Detection rules are retrieved from Rulezet.


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.