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NVD / CVE Program· CNA mitre

CVE-2021-43976: 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 cra

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.69% (FIRST EPSS); higher than 52.8% of all records.
  • Physical access to the device is required. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: linux (Debian:11) 5.10.92-2; linux (Debian:12) 5.15.15-2; linux (Debian:9) 4.9.303-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to linux (Debian:11) 5.10.92-2; linux (Debian:12) 5.15.15-2; linux (Debian:9) 4.9.303-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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).

MediumCVSS 4.6 · v3.1—No exploit Fix available
Published
Nov 17, 2021
Updated
Jun 17, 2026
EPSS
0.6% · 52th percentile
CWE
—

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-43976

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
fedoraprojectfedora
debiandebian linux
netappcloud backup
netapph300s firmware
netapph300s
netapph500s firmware
netapph500s
netapph700s firmware
netapph700s
netapph300e firmware
netapph300e

and 11 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux11.0
  • debian debian linux9.0
  • fedoraproject fedora34
  • fedoraproject fedora35
  • linux linux kernelup to 5.15.2 inclusive
  • netapp cloud backupall versions
  • netapp h300e firmwareall versions
  • netapp h300s firmwareall versions
  • netapp h410c firmwareall versions
  • netapp h410s firmwareall versions
  • netapp h500e firmwareall versions
  • netapp h500s firmwareall versions
  • netapp h700e firmwareall versions
  • netapp h700s firmwareall versions
  • oracle communications cloud native core binding support function22.1.3
  • oracle communications cloud native core network exposure function22.1.1
  • oracle communications cloud native core policy22.2.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:11linuxbefore 5.10.92-25.10.92-2
Debian:12linuxbefore 5.15.15-25.15.15-2
Debian:9linuxbefore 4.9.303-14.9.303-1
openSUSE:Leap 15.3connmanbefore 1.41-bp153.2.3.11.41-bp153.2.3.1
openSUSE:Leap 15.3dtb-aarch64before 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-64kbbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-azurebefore 5.3.18-38.34.15.3.18-38.34.1
openSUSE:Leap 15.3kernel-debugbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-defaultbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-default-basebefore 5.3.18-59.40.1.18.25.15.3.18-59.40.1.18.25.1
openSUSE:Leap 15.3kernel-docsbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-kvmsmallbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-obs-buildbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-obs-qabefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-preemptbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-sourcebefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-source-azurebefore 5.3.18-38.34.15.3.18-38.34.1
openSUSE:Leap 15.3kernel-symsbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Leap 15.3kernel-syms-azurebefore 5.3.18-38.34.15.3.18-38.34.1
openSUSE:Leap 15.3kernel-zfcpdumpbefore 5.3.18-59.40.15.3.18-59.40.1
openSUSE:Tumbleweedkernel-sourcebefore 5.15.6-1.35.15.6-1.3
SUSE:HPE Helion OpenStack 8kernel-defaultbefore 4.4.180-94.153.14.4.180-94.153.1
SUSE:HPE Helion OpenStack 8kernel-sourcebefore 4.4.180-94.153.14.4.180-94.153.1
SUSE:HPE Helion OpenStack 8kernel-symsbefore 4.4.180-94.153.14.4.180-94.153.1

+47

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2020-27820Nov 2, 2021 · A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is
    18Monitor
  • ← EarlierCVE-2021-43389Nov 4, 2021 · An issue was discovered in the Linux kernel before 5.14.15.
    22Monitor
  • Later →CVE-2021-43975Nov 17, 2021 · In the Linux kernel through 5.15.2, hw_atl_utils_fw_rpc_wait in drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.c allows an attac
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux5.15.15-2 · Debian:12Package registry (OSV)
opensuse:connman1.41-bp153.2.3.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:dtb-aarch645.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-64kb5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-debug5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-default5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-default-base5.3.18-59.40.1.18.25.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-docs5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-kvmsmall5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-obs-build5.3.18-59.40.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-source-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
opensuse:kernel-syms-azure5.3.18-38.34.1 · openSUSE:Leap 15.3Package registry (OSV)
suse:connman1.41-bp153.2.3.1 · SUSE:Package Hub 15 SP3Package registry (OSV)
suse:kernel-azure5.3.18-38.34.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP3Package registry (OSV)
suse:kernel-default4.12.14-122.106.1 · SUSE:Linux Enterprise High Availability Extension 12 SP5Package registry (OSV)
suse:kernel-docs4.12.14-122.106.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-obs-build4.12.14-122.106.1 · SUSE:Linux Enterprise Software Development Kit 12 SP5Package registry (OSV)
suse:kernel-rt5.3.18-68.1 · SUSE:Real Time Module 15 SP3Package registry (OSV)
suse:kernel-rt_debug5.3.18-68.1 · SUSE:Real Time Module 15 SP3Package registry (OSV)
suse:kernel-source4.12.14-122.106.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-source-azure5.3.18-38.34.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP3Package registry (OSV)
suse:kernel-source-rt5.3.18-68.1 · SUSE:Real Time Module 15 SP3Package registry (OSV)
suse:kernel-syms4.12.14-122.106.1 · SUSE:Linux Enterprise Server 12 SP5Package registry (OSV)
suse:kernel-syms-azure5.3.18-38.34.1 · SUSE:Linux Enterprise Module for Public Cloud 15 SP3Package registry (OSV)
suse:kgraft-patch-SLE12-SP5_Update_271-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Physical access to the device is required.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Physical
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records