NVD / CVE Program· CNA Linux

CVE-2026-46180: wifi: brcmfmac: Fix potential use-after-free issue when stopping watchdog task

Noroxi assessment

Priority: Monitor (action score 31/100)

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: 0.14% (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 658d2e46c2e9a8eb9b80c5e803ce3c89885b3366, 908b92231e1ded53e43fcfad5e0704d83e1b803c, a21f735fb1017ef89c6f9dbf4d799513b4e7bd5a; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 658d2e46c2e9a8eb9b80c5e803ce3c89885b3366, 908b92231e1ded53e43fcfad5e0704d83e1b803c, a21f735fb1017ef89c6f9dbf4d799513b4e7bd5a; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential use-after-free issue when stopping watchdog task Watchdog task might end between send_sig() and kthread_stop() calls, what results in the use-after-free issue. Fix this by increasing watchdog task reference count before calling send_sig() and dropping it by switching to kthread_stop_put().

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 28, 2026
Updated: Nov 6, 2026
EPSS: 0.1% · 3th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 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.

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.

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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 kernel3.3 and later · before 6.6.140
linux linux kernel6.7 and later · before 6.12.88
linux linux kernel6.13 and later · before 6.18.30
linux linux kernel6.19 and later · before 7.0.7
linux linux kernel7.1

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
- 3.3affected
- a9ffda88be7416b8336f644806c2b3ed3ce08b26 and later · before a21f735fb1017ef89c6f9dbf4d799513b4e7bd5aaffected · git
- a9ffda88be7416b8336f644806c2b3ed3ce08b26 and later · before df2e90d6a9955510f24f1dada78cfc439fd9fa88affected · git
- a9ffda88be7416b8336f644806c2b3ed3ce08b26 and later · before d616bb10de79e5c2bd8a24230a1128aeaf715615affected · git
- a9ffda88be7416b8336f644806c2b3ed3ce08b26 and later · before ed4168d1a50fef5be8eca947fbbf05a28507d265affected · git
- a9ffda88be7416b8336f644806c2b3ed3ce08b26 and later · before d16827cb1d3936f7627d0da6044483f743ebde03affected · git
- a9ffda88be7416b8336f644806c2b3ed3ce08b26 and later · before 658d2e46c2e9a8eb9b80c5e803ce3c89885b3366affected · git
- a9ffda88be7416b8336f644806c2b3ed3ce08b26 and later · before 908b92231e1ded53e43fcfad5e0704d83e1b803caffected · git
- a9ffda88be7416b8336f644806c2b3ed3ce08b26 and later · before c623b63580880cc742255eaed3d79804c1b91143affected · git
- before 3.3not affected · semver

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 6.1.176-1	6.1.176-1
Debian:13	linux	before 6.12.88-1	6.12.88-1
Debian:14	linux	before 7.0.7-1	7.0.7-1

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-2026-46177May 28, 2026 · ipmi: Add limits to event and receive message requests
30Monitor
← EarlierCVE-2026-46178May 28, 2026 · RDMA/mlx4: Fix resource leak on error in mlx4_ib_create_srq()
31Monitor
Later →CVE-2026-46181May 28, 2026 · RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()
31Monitor

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	658d2e46c2e9a8eb9b80c5e803ce3c89885b3366	Vendor (CNA)
Linux Linux	908b92231e1ded53e43fcfad5e0704d83e1b803c	Vendor (CNA)
Linux Linux	a21f735fb1017ef89c6f9dbf4d799513b4e7bd5a	Vendor (CNA)
Linux Linux	c623b63580880cc742255eaed3d79804c1b91143	Vendor (CNA)
Linux Linux	d16827cb1d3936f7627d0da6044483f743ebde03	Vendor (CNA)
Linux Linux	d616bb10de79e5c2bd8a24230a1128aeaf715615	Vendor (CNA)
Linux Linux	df2e90d6a9955510f24f1dada78cfc439fd9fa88	Vendor (CNA)
Linux Linux	ed4168d1a50fef5be8eca947fbbf05a28507d265	Vendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.0	6.6.141.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.176-1 · 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).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

TR-26-0290 · Jun 2, 2026(Linux Kernel Güvenlik Bildirimi)

All national notices →

Technical details

Attack conditions

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.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

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

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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

SSVC exploitation— → noneNov 6, 2026, 6:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

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

References

git.kernel.org/stable/c/658d2e46c2e9a8eb9b80c5e803ce3c89885b3366

Show all references (8 more)

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

All records