CVE-2021-47323

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: 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.

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 25, 2026
No patch confirmed yet.
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/0015581a79bbf8e521f85dddb7d3e4a66b9f51d4
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/f0feab82f6a0323f54d85e8b512a2be64f83648a
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b4565a8a2d6bffb05bfbec11399d261ec16fe373
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/b3c41ea5bc34d8c7b19e230d80e0e555c6f5057d
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a173e3b62cf6dd3c4a0a10c8a82eedfcae81a566
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/90b7c141132244e8e49a34a4c1e445cce33e07f4
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/7c56c5508dc20a6b133bc669fc34327a6711c24c
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/522e75ed63f67e815d4ec0deace67df22d9ce78e
generic

watchdog: sc520_wdt: Fix possible use-after-free in wdt_turnoff() - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/2aef07017fae21c3d8acea9656b10e3b9c0f1e04

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 8× in last 7d / 29× 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 160 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 07:13 UTCOSV refresh
  7. 2026-09-19 15:38 UTCEPSS rescore
  8. 2026-09-18 19:24 UTCEPSS rescore
  9. 2026-09-17 19:23 UTCEPSS rescore
  10. 2026-09-16 14:05 UTCEPSS rescore
  11. 2026-09-16 14:05 UTCEPSS rescore
  12. 2026-09-15 03:06 UTCEPSS rescore
  13. 2026-09-12 14:57 UTCEPSS rescore
  14. 2026-09-11 14:49 UTCEPSS rescore
  15. 2026-09-11 09:33 UTCEPSS rescore
  16. 2026-09-08 21:57 UTCEPSS rescore
  17. 2026-09-07 15:58 UTCEPSS rescore
  18. 2026-09-06 13:45 UTCEPSS rescore
  19. 2026-09-05 15:25 UTCEPSS rescore
  20. 2026-09-04 13:57 UTCEPSS rescore
  21. 2026-09-04 05:03 UTCEPSS rescore
  22. 2026-09-02 14:09 UTCEPSS rescore
  23. 2026-09-01 13:51 UTCEPSS rescore
  24. 2026-09-01 10:29 UTCOSV refresh
  25. 2026-08-30 19:14 UTCEPSS rescore
Show 75 more
  1. 2026-08-30 01:19 UTCEPSS rescore
  2. 2026-08-28 21:38 UTCEPSS rescore
  3. 2026-08-27 14:22 UTCEPSS rescore
  4. 2026-08-26 14:43 UTCEPSS rescore
  5. 2026-08-25 13:46 UTCEPSS rescore
  6. 2026-08-24 14:13 UTCEPSS rescore
  7. 2026-08-21 23:46 UTCEPSS rescore
  8. 2026-08-20 22:52 UTCEPSS rescore
  9. 2026-08-19 17:01 UTCEPSS rescore
  10. 2026-08-18 13:45 UTCEPSS rescore
  11. 2026-08-17 13:44 UTCEPSS rescore
  12. 2026-08-16 14:53 UTCEPSS rescore
  13. 2026-08-16 02:11 UTCEPSS rescore
  14. 2026-08-15 10:07 UTCOSV refresh
  15. 2026-08-15 01:27 UTCEPSS rescore
  16. 2026-08-13 21:57 UTCEPSS rescore
  17. 2026-08-12 13:48 UTCEPSS rescore
  18. 2026-08-11 13:38 UTCEPSS rescore
  19. 2026-08-09 13:44 UTCEPSS rescore
  20. 2026-08-08 16:34 UTCEPSS rescore
  21. 2026-08-07 16:24 UTCEPSS rescore
  22. 2026-08-06 13:44 UTCEPSS rescore
  23. 2026-08-05 19:15 UTCEPSS rescore
  24. 2026-08-04 15:06 UTCEPSS rescore
  25. 2026-08-04 10:34 UTCEPSS rescore
  26. 2026-08-03 10:33 UTCEPSS rescore
  27. 2026-08-02 02:24 UTCEPSS rescore
  28. 2026-08-01 04:13 UTCEPSS rescore
  29. 2026-07-30 21:51 UTCOSV refresh
  30. 2026-07-30 16:25 UTCEPSS rescore
  31. 2026-07-30 01:28 UTCEPSS rescore
  32. 2026-07-28 15:33 UTCEPSS rescore
  33. 2026-07-25 14:15 UTCEPSS rescore
  34. 2026-07-24 14:15 UTCEPSS rescore
  35. 2026-07-24 14:15 UTCEPSS rescore
  36. 2026-07-23 14:16 UTCEPSS rescore
  37. 2026-07-23 02:06 UTCEG score recompute
  38. 2026-07-22 22:53 UTCEG score recompute
  39. 2026-07-22 14:06 UTCEPSS rescore
  40. 2026-07-21 15:22 UTCEPSS rescore
  41. 2026-07-21 15:22 UTCEPSS rescore
  42. 2026-07-20 17:05 UTCEPSS rescore
  43. 2026-07-19 14:29 UTCEPSS rescore
  44. 2026-07-19 02:27 UTCEPSS rescore
  45. 2026-07-19 02:27 UTCEPSS rescore
  46. 2026-07-18 10:02 UTCEPSS rescore
  47. 2026-07-16 17:00 UTCEPSS rescore
  48. 2026-07-16 17:00 UTCEPSS rescore
  49. 2026-07-15 16:55 UTCEPSS rescore
  50. 2026-07-15 01:58 UTCEPSS rescore
  51. 2026-07-15 01:58 UTCEPSS rescore
  52. 2026-07-13 22:27 UTCEPSS rescore
  53. 2026-07-13 07:07 UTCOSV refresh
  54. 2026-07-12 05:44 UTCEPSS rescore
  55. 2026-07-11 08:25 UTCEPSS rescore
  56. 2026-07-09 19:07 UTCEPSS rescore
  57. 2026-07-09 19:07 UTCEPSS rescore
  58. 2026-07-08 15:12 UTCEPSS rescore
  59. 2026-07-08 15:12 UTCEPSS rescore
  60. 2026-07-07 13:43 UTCEPSS rescore
  61. 2026-07-06 16:25 UTCEPSS rescore
  62. 2026-07-06 16:25 UTCEPSS rescore
  63. 2026-07-06 02:21 UTCEPSS rescore
  64. 2026-07-06 02:21 UTCEPSS rescore
  65. 2026-07-05 02:28 UTCEPSS rescore
  66. 2026-07-05 02:28 UTCEPSS rescore
  67. 2026-07-04 06:29 UTCEPSS rescore
  68. 2026-07-04 06:29 UTCEPSS rescore
  69. 2026-07-01 15:04 UTCEPSS rescore
  70. 2026-06-30 23:20 UTCEPSS rescore
  71. 2026-06-28 14:05 UTCEPSS rescore
  72. 2026-06-28 04:54 UTCEPSS rescore
  73. 2026-06-28 04:54 UTCEPSS rescore
  74. 2026-06-27 03:07 UTCEPSS rescore
  75. 2026-06-27 03:06 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2021-47323?
CVE-2021-47323 is a high vulnerability published on May 21, 2024. In the Linux kernel, the following vulnerability has been resolved: watchdog: sc520wdt: Fix possible use-after-free in wdtturnoff() 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…
When was CVE-2021-47323 disclosed?
CVE-2021-47323 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-2021-47323 actively exploited?
CVE-2021-47323 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-2021-47323?
CVE-2021-47323 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2021-47323?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47323, 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-2021-47323

Explore →

Is Your Infrastructure Affected by CVE-2021-47323?

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

Book a Demo →Browse All CVEs