CVE-2021-47091

MEDIUMNVD 5.55.5—

5.5

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

mac80211: fix locking in ieee80211_start_ap error path

We need to hold the local->mtx to release the channel context, as even encoded by the lockdep_assert_held() there. Fix it.

CVSS v3: 5.5
EG Score: 5.5(medium)
EPSS: 1.8%
KEV: Not listed

Published

March 4, 2024

Last Modified

February 3, 2025

References (6)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/87a270625a89fc841f1a7e21aae6176543d8385c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ac61b9c6c0549aaeb98194cf429d93c41bfe5f79
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c1d1ec4db5f7264cfc21993e59e8f2dcecf4b44f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/87a270625a89fc841f1a7e21aae6176543d8385c
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ac61b9c6c0549aaeb98194cf429d93c41bfe5f79
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c1d1ec4db5f7264cfc21993e59e8f2dcecf4b44f

Weakness Classification(1)

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

CWE-667

Data Freshness Timeline

(refreshed 10× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-24 07:17 UTCEG score recompute
2026-05-24 07:17 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2021-47091?

CVE-2021-47091 is a medium vulnerability published on March 4, 2024. In the Linux kernel, the following vulnerability has been resolved: mac80211: fix locking in ieee80211startap error path We need to hold the local->mtx to release the channel context, as even encoded by the lockdepassertheld() there. Fix it.

When was CVE-2021-47091 disclosed?

CVE-2021-47091 was first published in the National Vulnerability Database on March 4, 2024, with the most recent update on February 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-47091 actively exploited?

CVE-2021-47091 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-47091?

CVE-2021-47091 has a CVSS v3 base score of 5.5 (NVD).

How do I remediate CVE-2021-47091?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-47091, 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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CVE-2021-47091

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-47091?

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Published

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References (6)

Frequently asked(5)

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