What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-28 · updated 2026-10-15
• Weakness: CWE-416

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().

Affected products

• Linux kernel: from 3.3 before 6.6.140; from 6.7 before 6.12.88; from 6.13 before 6.18.30; from 6.19 before 7.0.7; 7.1-rc1, 7.1-rc2 — fixed in 6.12.88, 6.18.30, 6.6.140, 7.0.7

How to fix

Upgrade to a fixed version: Linux kernel 6.12.88, 6.18.30, 6.6.140, 7.0.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/658d2e46c2e9a8eb9b80c5e803ce3c89885b3366
• https://git.kernel.org/stable/c/908b92231e1ded53e43fcfad5e0704d83e1b803c
• https://git.kernel.org/stable/c/a21f735fb1017ef89c6f9dbf4d799513b4e7bd5a
• https://git.kernel.org/stable/c/c623b63580880cc742255eaed3d79804c1b91143
• https://git.kernel.org/stable/c/d16827cb1d3936f7627d0da6044483f743ebde03
• https://git.kernel.org/stable/c/d616bb10de79e5c2bd8a24230a1128aeaf715615
• https://git.kernel.org/stable/c/df2e90d6a9955510f24f1dada78cfc439fd9fa88
• https://git.kernel.org/stable/c/ed4168d1a50fef5be8eca947fbbf05a28507d265
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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