CVE-2021-47124

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2024-03-15. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: 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:

io_uring: fix link timeout refs

WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28 RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28 Call Trace: __refcount_sub_and_test include/linux/refcount.h:283 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] io_put_req fs/io_uring.c:2140 [inline] io_queue_linked_timeout fs/io_uring.c:6300 [inline] __io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354 io_submit_sqe fs/io_uring.c:6534 [inline] io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660 __do_sys_io_uring_enter fs/io_uring.c:9240 [inline] __se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182

io_link_timeout_fn() should put only one reference of the linked timeout request, however in case of racing with the master request's completion first io_req_complete() puts one and then io_put_req_deferred() is called.

CVSS v3
5.5
EG Score
5.5(medium)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
15%
KEV
Not listed

Published

March 15, 2024

Last Modified

August 5, 2026

References (5)

Data Freshness Timeline

(refreshed 12× in last 7d / 45× 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 124 total refreshes for this CVE.

  1. 2026-08-07 16:24 UTCEPSS rescore
  2. 2026-08-05 19:15 UTCEPSS rescore
  3. 2026-08-05 09:43 UTCEG score recompute
  4. 2026-08-05 09:43 UTCGHSA enrichment
  5. 2026-08-04 15:06 UTCEPSS rescore
  6. 2026-08-04 12:20 UTCEG score recompute
  7. 2026-08-04 12:20 UTCGHSA enrichment
  8. 2026-08-04 10:34 UTCEPSS rescore
  9. 2026-08-04 09:53 UTCEG score recompute
  10. 2026-08-04 09:53 UTCGHSA enrichment
  11. 2026-08-03 10:33 UTCEPSS rescore
  12. 2026-08-02 02:24 UTCEPSS rescore
  13. 2026-08-01 10:06 UTCOSV refresh
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  23. 2026-07-23 02:06 UTCEG score recompute
  24. 2026-07-22 22:52 UTCEG score recompute
  25. 2026-07-22 14:06 UTCEPSS rescore
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  1. 2026-07-21 15:22 UTCEPSS rescore
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  13. 2026-07-14 16:55 UTCOSV refresh
  14. 2026-07-13 22:27 UTCEPSS rescore
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  41. 2026-06-26 17:39 UTCOSV refresh
  42. 2026-06-25 13:48 UTCEPSS rescore
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  54. 2026-06-18 17:51 UTCEPSS rescore
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  68. 2026-06-09 01:00 UTCOSV refresh
  69. 2026-06-08 14:15 UTCEPSS rescore
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  74. 2026-06-06 13:46 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-47124?
CVE-2021-47124 is a medium vulnerability published on March 15, 2024. In the Linux kernel, the following vulnerability has been resolved: io_uring: fix link timeout refs WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcountwarnsaturate+0x15b/0x1a0 lib/refcount.c:28 RIP: 0010:refcountwarnsaturate+0x15b/0x1a0 lib/refcount.c:28 Call Trace: refcountsuband_test…
When was CVE-2021-47124 disclosed?
CVE-2021-47124 was first published in the National Vulnerability Database on March 15, 2024, with the most recent update on August 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-47124 actively exploited?
CVE-2021-47124 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 84.7% of all scored CVEs.
What is the CVSS score of CVE-2021-47124?
CVE-2021-47124 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2021-47124?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47124, 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.

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