VulnerabilityPublished 28 May 2026Updated 6 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ed4168d1a50fef5be8eca947fbbf05a28507d265 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in ed4168d1a50fef5be8eca947fbbf05a28507d265, df2e90d6a9955510f24f1dada78cfc439fd9fa88, d16827cb1d3936f7627d0da6044483f743ebde03 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 28 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ a9ffda88be7416b8336f644806c2b3ed3ce08b26, < ed4168d1a50fef5be8eca947fbbf05a28507d265	Fixed in ed4168d1a50fef5be8eca947fbbf05a28507d265
LinuxLinux	Affected ≥ a9ffda88be7416b8336f644806c2b3ed3ce08b26, < df2e90d6a9955510f24f1dada78cfc439fd9fa88	Fixed in df2e90d6a9955510f24f1dada78cfc439fd9fa88
LinuxLinux	Affected ≥ a9ffda88be7416b8336f644806c2b3ed3ce08b26, < d16827cb1d3936f7627d0da6044483f743ebde03	Fixed in d16827cb1d3936f7627d0da6044483f743ebde03
LinuxLinux	Affected ≥ a9ffda88be7416b8336f644806c2b3ed3ce08b26, < d616bb10de79e5c2bd8a24230a1128aeaf715615	Fixed in d616bb10de79e5c2bd8a24230a1128aeaf715615
LinuxLinux	Affected ≥ a9ffda88be7416b8336f644806c2b3ed3ce08b26, < c623b63580880cc742255eaed3d79804c1b91143	Fixed in c623b63580880cc742255eaed3d79804c1b91143
LinuxLinux	Affected ≥ a9ffda88be7416b8336f644806c2b3ed3ce08b26, < a21f735fb1017ef89c6f9dbf4d799513b4e7bd5a	Fixed in a21f735fb1017ef89c6f9dbf4d799513b4e7bd5a

Description

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().

References

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