CVE-2021-46979

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2024-02-28. NVD baseline CVSS 5.5; sources differ by 0.0.

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

iio: core: fix ioctl handlers removal

Currently ioctl handlers are removed twice. For the first time during iio_device_unregister() then later on inside iio_device_unregister_eventset() and iio_buffers_free_sysfs_and_mask(). Double free leads to kernel panic.

Fix this by not touching ioctl handlers list directly but rather letting code responsible for registration call the matching cleanup routine itself.

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
12.8%
KEV
Not listed

Published

February 28, 2024

Last Modified

December 31, 2024

References (6)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 48× 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.

  1. 2026-07-23 02:06 UTCEG score recompute
  2. 2026-07-22 22:52 UTCEG score recompute
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  72. 2026-05-24 07:45 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2021-46979?
CVE-2021-46979 is a medium vulnerability published on February 28, 2024. In the Linux kernel, the following vulnerability has been resolved: iio: core: fix ioctl handlers removal Currently ioctl handlers are removed twice. For the first time during iiodeviceunregister() then later on inside iiodeviceunregistereventset() and iiobuffersfreesysfsandmask(). Double free…
When was CVE-2021-46979 disclosed?
CVE-2021-46979 was first published in the National Vulnerability Database on February 28, 2024, with the most recent update on December 31, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-46979 actively exploited?
CVE-2021-46979 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-46979?
CVE-2021-46979 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2021-46979?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-46979, 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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