MEDIUM
CVE-2021-43976
NVD-CWE-noinfoPublished: November 17, 2021· Updated: Jun 17, 2026
4.6
CVSS v3.1
Official Description
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).
Technical Analysis
CVE-2021-43976 requires local access, meaning attackers must already have a foothold on the target system.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.6.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorPhysical
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Vendors & Products
Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
Linux1 product(s)
linux kernel
netapp17 product(s)
cloud backuph300s firmwareh300sh500s firmwareh500sh700s firmwareh700sh300e firmwareh300eh500e firmwareh500eh700e firmware+5
Oracle3 product(s)
communications cloud native core binding support functioncommunications cloud native core network exposure functioncommunications cloud native core policy
Source: NVD CPE · 26 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (20)
→
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20211210-0001/Third Party Advisory
→
https://www.debian.org/security/2022/dsa-5092Third Party Advisory
→
https://www.debian.org/security/2022/dsa-5096Third Party Advisory
→
https://www.oracle.com/security-alerts/cpujul2022.htmlPatch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/03/msg00011.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2022/03/msg00012.htmlMailing List · Third Party Advisory
Quick Facts
CVE IDCVE-2021-43976
CVSS Score4.6 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected5 vendor(s)
PublishedNov 17, 2021
Related CVEs (NVD-CWE-noinfo)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-43976 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.