CVE-2021-43976

MEDIUMNVD 4.64.6—

4.6

In the Linux kernel through 5.15.2, mwifiex_usb_recv in drivers/net/wireless/marvell/mwifiex/usb.c allows an attacker (who can connect a crafted USB device) to cause a denial of service (skb_over_panic).

CVSS v3: 4.6
EG Score: 4.6(medium)
EPSS: 15.1%
KEV: Not listed

Published

November 17, 2021

Last Modified

November 21, 2024

References (20)

cve@mitrehttps://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=04d80663f67ccef893061b49ec8a42ff7045ae84
cve@mitrehttps://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
cve@mitrehttps://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X24M7KDC4OJOZNS3RDSYC7ELNELOLQ2N/
cve@mitrehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YODMYMGZYDXQKGJGX7TJG4XV4L5YLLBD/
cve@mitrehttps://patchwork.kernel.org/project/linux-wireless/patch/YX4CqjfRcTa6bVL+%40Zekuns-MBP-16.fios-router.home/
cve@mitrehttps://security.netapp.com/advisory/ntap-20211210-0001/
cve@mitrehttps://www.debian.org/security/2022/dsa-5092
cve@mitrehttps://www.debian.org/security/2022/dsa-5096
cve@mitrehttps://www.oracle.com/security-alerts/cpujul2022.html
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=04d80663f67ccef893061b49ec8a42ff7045ae84
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X24M7KDC4OJOZNS3RDSYC7ELNELOLQ2N/
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YODMYMGZYDXQKGJGX7TJG4XV4L5YLLBD/

Patch Availability(8)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-oem-5.14-tools-host (5.14.0-1024.26) @ focal	2026-05-26	ubuntu
ubuntu	linux-signed-image-lowlatency-hwe-16.04-edge (4.15.0.173.162) @ bionic	2026-05-26	ubuntu
ubuntu	linux-headers-bluefield (5.4.0.1032.33) @ focal	2026-05-26	ubuntu
ubuntu	linux-headers-azure-fde (5.4.0.1073.76+cvm1.19) @ focal	2026-05-26	ubuntu
ubuntu	linux-image-lowlatency (4.4.0.223.230) @ xenial	2026-05-26	ubuntu
ubuntu	linux-image-lowlatency (5.13.0.40.49) @ impish	2026-05-26	ubuntu
redhat	kernel-rt-0:4.18.0-372.9.1.rt7.166.el8	2022-05-10	redhat
redhat	kernel-0:4.18.0-372.9.1.el8	2022-05-10	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

All Vendor Advisories

(9)

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 11× in last 7d / 20× 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.

2026-06-08 14:15 UTCEPSS rescore
2026-06-08 14:15 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-07 15:23 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-06 13:46 UTCEPSS rescore
2026-06-05 22:45 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-05 06:09 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-04 13:10 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-02 20:11 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-06-01 13:50 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-31 00:15 UTCEPSS rescore
2026-05-29 13:42 UTCEPSS rescore

Frequently asked(5)

What is CVE-2021-43976?

CVE-2021-43976 is a medium vulnerability published on November 17, 2021. In the Linux kernel through 5.15.2, mwifiexusbrecv in drivers/net/wireless/marvell/mwifiex/usb.c allows an attacker (who can connect a crafted USB device) to cause a denial of service (skboverpanic).

When was CVE-2021-43976 disclosed?

CVE-2021-43976 was first published in the National Vulnerability Database on November 17, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-43976 actively exploited?

CVE-2021-43976 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-43976?

CVE-2021-43976 has a CVSS v3 base score of 4.6 (NVD).

How do I remediate CVE-2021-43976?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-43976, 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

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