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No exploitation reportedFix available

CVE-2021-47323

No exploitation reported by the sources we read.

  • Published2024-05-21
  • Fixed inf0feab82f6a0 · b4565a8a2d6b · b3c41ea5bc34 · a173e3b62cf6 · 0015581a79bb · 522e75ed63f6
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2024-05-2115:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-47323?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-47323?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

CISA-ADP · NVD
Linux linux kernel
BranchAffectedFixed in
1+≥ 1da177e4c3f4, < f0feab82f6a0f0feab82f6a0
1+≥ 1da177e4c3f4, < b4565a8a2d6bb4565a8a2d6b
1+≥ 1da177e4c3f4, < b3c41ea5bc34b3c41ea5bc34
1+≥ 1da177e4c3f4, < a173e3b62cf6a173e3b62cf6
15581.x≥ 1da177e4c3f4, < 0015581a79bb0015581a79bb
522.x≥ 1da177e4c3f4, < 522e75ed63f6522e75ed63f6
90.x≥ 1da177e4c3f4, < 90b7c141132290b7c1411322
7.x≥ 1da177e4c3f4, < 7c56c5508dc27c56c5508dc2
5.13≥ 5.13, < 5.13.45.13.4
5.x≥ 5.11, < 5.12.195.12.19
5.x≥ 5.5, < 5.10.525.10.52
5.4≥ 4.20, < 5.4.1345.4.134

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Linux linux kernel to f0feab82f6a0 · b4565a8a2d6b · b3c41ea5bc34 · a173e3b62cf6 · 0015581a79bb · 522e75ed63f6 · 90b7c1411322 · 7c56c5508dc2

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2024-05-21
Last Modified
2026-06-17
NVD status
Analyzed

Frequently asked questions

What is CVE-2021-47323?

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.

Is CVE-2021-47323 actively exploited?

Active exploitation of CVE-2021-47323 has not been confirmed. Its EPSS score was 1.2% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-47323?

CVE-2021-47323 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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