CVE-2021-47324

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2024-05-21. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

In the Linux kernel, the following vulnerability has been resolved:

watchdog: Fix possible use-after-free in wdt_startup()

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
66%
KEV
Not listed

Published

May 21, 2024

Last Modified

April 2, 2025

Advisory Details (9)

Auto-updated Aug 30, 2026
No patch confirmed yet.
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0ac50a76cf3cd63db000648b3b19f3f98b8aaa76
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/dc9403097be52d57a5c9c35efa9be79d166a78af
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/c08a6b31e4917034f0ed0cb457c3bb209576f542
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b4ebf4a4692e84163a69444c70ad515de06e2259
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a397cb4576fc2fc802562418b3a50b8f67d60d31
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/8adbbe6c86bb13e14f8a19e036ae5f4f5661fd90
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/862f2b5a7c38762ac9e369daefbf361a91aca685
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/63a3dc24bd053792f84cb4eef0168b1266202a02
generic

watchdog: Fix possible use-after-free in wdt_startup() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/146cc288fb80c662c9c35e7bc58325d1ac0a7875

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux5.10.46-4, 5.10.46-5, 5.10.70-1~bpo10+15.10.70-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.6-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.6-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux—5.14.6-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 162 total refreshes for this CVE.

  1. 2026-09-24 14:00 UTCEPSS rescore
  2. 2026-09-24 14:00 UTCEPSS rescore
  3. 2026-09-23 13:45 UTCEPSS rescore
  4. 2026-09-22 14:44 UTCEPSS rescore
  5. 2026-09-21 20:28 UTCEPSS rescore
  6. 2026-09-20 20:13 UTCEPSS rescore
  7. 2026-09-20 06:43 UTCOSV refresh
  8. 2026-09-19 15:38 UTCEPSS rescore
  9. 2026-09-18 19:24 UTCEPSS rescore
  10. 2026-09-17 19:23 UTCEPSS rescore
  11. 2026-09-16 14:05 UTCEPSS rescore
  12. 2026-09-16 14:05 UTCEPSS rescore
  13. 2026-09-15 03:06 UTCEPSS rescore
  14. 2026-09-12 14:57 UTCEPSS rescore
  15. 2026-09-11 14:49 UTCEPSS rescore
  16. 2026-09-11 09:33 UTCEPSS rescore
  17. 2026-09-08 21:57 UTCEPSS rescore
  18. 2026-09-07 15:58 UTCEPSS rescore
  19. 2026-09-06 13:45 UTCEPSS rescore
  20. 2026-09-05 15:25 UTCEPSS rescore
  21. 2026-09-04 13:57 UTCEPSS rescore
  22. 2026-09-04 05:03 UTCEPSS rescore
  23. 2026-09-02 14:09 UTCEPSS rescore
  24. 2026-09-01 13:51 UTCEPSS rescore
  25. 2026-09-01 10:29 UTCOSV refresh
Show 75 more
  1. 2026-08-30 19:14 UTCEPSS rescore
  2. 2026-08-30 01:19 UTCEPSS rescore
  3. 2026-08-28 21:38 UTCEPSS rescore
  4. 2026-08-27 14:22 UTCEPSS rescore
  5. 2026-08-26 14:43 UTCEPSS rescore
  6. 2026-08-25 13:46 UTCEPSS rescore
  7. 2026-08-24 14:13 UTCEPSS rescore
  8. 2026-08-21 23:46 UTCEPSS rescore
  9. 2026-08-20 22:52 UTCEPSS rescore
  10. 2026-08-19 17:01 UTCEPSS rescore
  11. 2026-08-18 13:45 UTCEPSS rescore
  12. 2026-08-17 13:44 UTCEPSS rescore
  13. 2026-08-16 14:53 UTCEPSS rescore
  14. 2026-08-16 02:11 UTCEPSS rescore
  15. 2026-08-15 09:37 UTCOSV refresh
  16. 2026-08-15 01:27 UTCEPSS rescore
  17. 2026-08-13 21:57 UTCEPSS rescore
  18. 2026-08-12 13:48 UTCEPSS rescore
  19. 2026-08-11 13:38 UTCEPSS rescore
  20. 2026-08-09 13:44 UTCEPSS rescore
  21. 2026-08-08 16:34 UTCEPSS rescore
  22. 2026-08-07 16:24 UTCEPSS rescore
  23. 2026-08-06 13:44 UTCEPSS rescore
  24. 2026-08-05 19:15 UTCEPSS rescore
  25. 2026-08-04 15:06 UTCEPSS rescore
  26. 2026-08-04 10:34 UTCEPSS rescore
  27. 2026-08-03 10:33 UTCEPSS rescore
  28. 2026-08-02 02:24 UTCEPSS rescore
  29. 2026-08-01 04:13 UTCEPSS rescore
  30. 2026-07-30 21:51 UTCOSV refresh
  31. 2026-07-30 16:25 UTCEPSS rescore
  32. 2026-07-30 01:28 UTCEPSS rescore
  33. 2026-07-28 15:33 UTCEPSS rescore
  34. 2026-07-26 14:52 UTCEPSS rescore
  35. 2026-07-25 14:15 UTCEPSS rescore
  36. 2026-07-24 14:15 UTCEPSS rescore
  37. 2026-07-24 14:15 UTCEPSS rescore
  38. 2026-07-23 14:16 UTCEPSS rescore
  39. 2026-07-23 02:06 UTCEG score recompute
  40. 2026-07-22 22:53 UTCEG score recompute
  41. 2026-07-22 14:06 UTCEPSS rescore
  42. 2026-07-21 15:22 UTCEPSS rescore
  43. 2026-07-21 15:22 UTCEPSS rescore
  44. 2026-07-20 17:05 UTCEPSS rescore
  45. 2026-07-19 14:29 UTCEPSS rescore
  46. 2026-07-19 02:27 UTCEPSS rescore
  47. 2026-07-19 02:27 UTCEPSS rescore
  48. 2026-07-18 10:02 UTCEPSS rescore
  49. 2026-07-16 17:00 UTCEPSS rescore
  50. 2026-07-16 17:00 UTCEPSS rescore
  51. 2026-07-15 16:55 UTCEPSS rescore
  52. 2026-07-15 01:58 UTCEPSS rescore
  53. 2026-07-15 01:58 UTCEPSS rescore
  54. 2026-07-13 22:27 UTCEPSS rescore
  55. 2026-07-13 07:07 UTCOSV refresh
  56. 2026-07-12 05:44 UTCEPSS rescore
  57. 2026-07-11 08:25 UTCEPSS rescore
  58. 2026-07-09 19:07 UTCEPSS rescore
  59. 2026-07-09 19:07 UTCEPSS rescore
  60. 2026-07-08 15:12 UTCEPSS rescore
  61. 2026-07-08 15:12 UTCEPSS rescore
  62. 2026-07-07 13:43 UTCEPSS rescore
  63. 2026-07-06 16:25 UTCEPSS rescore
  64. 2026-07-06 16:25 UTCEPSS rescore
  65. 2026-07-06 02:21 UTCEPSS rescore
  66. 2026-07-06 02:21 UTCEPSS rescore
  67. 2026-07-05 02:28 UTCEPSS rescore
  68. 2026-07-05 02:28 UTCEPSS rescore
  69. 2026-07-04 06:29 UTCEPSS rescore
  70. 2026-07-04 06:29 UTCEPSS rescore
  71. 2026-07-01 15:04 UTCEPSS rescore
  72. 2026-06-30 23:20 UTCEPSS rescore
  73. 2026-06-28 14:05 UTCEPSS rescore
  74. 2026-06-28 04:54 UTCEPSS rescore
  75. 2026-06-28 04:54 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-47324?
CVE-2021-47324 is a high vulnerability published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: watchdog: Fix possible use-after-free in wdt_startup() 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…
When was CVE-2021-47324 disclosed?
CVE-2021-47324 was first published in the National Vulnerability Database on May 21, 2024, with the most recent update on April 2, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47324 actively exploited?
CVE-2021-47324 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 34.3% of all scored CVEs.
What is the CVSS score of CVE-2021-47324?
CVE-2021-47324 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-47324?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47324, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-47324

Explore →

Is Your Infrastructure Affected by CVE-2021-47324?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.