NVD / CVE Program· CNA Linux

CVE-2021-47494: cfg80211: fix management registrations locking

Noroxi assessment

Priority: Monitor (action score 22/100)

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: 0.16% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 09b1d5dc6ce1c9151777f6c4e128a59457704c97, 3c897f39b71fe68f90599f6a45b5f7bf5618420e, 4c22227e39c7a0b4dab55617ee8d34d171fab8d4.
Severity is disputed: the assigning authority (CNA) scores it 7.8, NVD 5.5.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 09b1d5dc6ce1c9151777f6c4e128a59457704c97, 3c897f39b71fe68f90599f6a45b5f7bf5618420e, 4c22227e39c7a0b4dab55617ee8d34d171fab8d4 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, the following vulnerability has been resolved: cfg80211: fix management registrations locking The management registrations locking was broken, the list was locked for each wdev, but cfg80211_mgmt_registrations_update() iterated it without holding all the correct spinlocks, causing list corruption. Rather than trying to fix it with fine-grained locking, just move the lock to the wiphy/rdev (still need the list on each wdev), we already need to hold the wdev lock to change it, so there's no contention on the lock in any case. This trivially fixes the bug since we hold one wdev's lock already, and now will hold the lock that protects all lists.

MediumCVSS 5.5 · v3.1—No exploit Fix available

Denial of service

BDU:2024-10626

Published: May 22, 2024
Updated: Aug 5, 2026
EPSS: 0.1% · 6th percentile
CWE: CWE-667

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 5.5
CNA · Linux: 7.8; 2.3 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel5.8 and later · before 5.10.77
linux linux kernel5.11 and later · before 5.14.16
linux linux kernel5.15

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 5.8affected
- 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d and later · before 4c22227e39c7a0b4dab55617ee8d34d171fab8d4affected · git
- 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d and later · before 3c897f39b71fe68f90599f6a45b5f7bf5618420eaffected · git
- 6cd536fe62ef58d7c4eac2da07ab0ed7fd19010d and later · before 09b1d5dc6ce1c9151777f6c4e128a59457704c97affected · git
- before 5.8not affected · semver
- 5.10.77 and later · up to and including 5.10.*not affected · semver
- 5.14.16 and later · up to and including 5.14.*not affected · semver
- 5.15 and laternot affected · original_commit_for_fix

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 5.15.3-1	5.15.3-1

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-2021-47492May 22, 2024 · mm, thp: bail out early in collapse_file for writeback page
22Monitor
← EarlierCVE-2021-47493May 22, 2024 · ocfs2: fix race between searching chunks and release journal_head from buffer_head
18Monitor
Later →CVE-2021-47495May 22, 2024 · usbnet: sanity check for maxpacket
22Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Linux Linux	09b1d5dc6ce1c9151777f6c4e128a59457704c97	Vendor (CNA)
Linux Linux	3c897f39b71fe68f90599f6a45b5f7bf5618420e	Vendor (CNA)
Linux Linux	4c22227e39c7a0b4dab55617ee8d34d171fab8d4	Vendor (CNA)
debian:linux	5.15.3-1 · Debian:12	Package 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.

No commit or PR link among the references.

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).