CVE-2021-47323 (GCVE-0-2021-47323)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2025-12-18 11:36
VLAI?
Title
watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff()
Summary
In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() This module'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 ?
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0015581a79bbf8e521f85dddb7d3e4a66b9f51d4 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b4565a8a2d6bffb05bfbec11399d261ec16fe373 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2aef07017fae21c3d8acea9656b10e3b9c0f1e04 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 522e75ed63f67e815d4ec0deace67df22d9ce78e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7c56c5508dc20a6b133bc669fc34327a6711c24c (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f0feab82f6a0323f54d85e8b512a2be64f83648a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 90b7c141132244e8e49a34a4c1e445cce33e07f4 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (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)
Create a notification for this product.
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      "cveMetadata": "{\"cveId\": \"CVE-2021-47323\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-12-18T11:36:43.127Z\", \"dateReserved\": \"2024-05-21T14:28:16.974Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:37.181Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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.