Bug 2405773 (CVE-2023-53715)

Summary: CVE-2023-53715 kernel: wifi: brcmfmac: cfg80211: Pass the PMK in binary instead of hex
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-10-22 14:06:16 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: brcmfmac: cfg80211: Pass the PMK in binary instead of hex

Apparently the hex passphrase mechanism does not work on newer
chips/firmware (e.g. BCM4387). It seems there was a simple way of
passing it in binary all along, so use that and avoid the hexification.

OpenBSD has been doing it like this from the beginning, so this should
work on all chips.

Also clear the structure before setting the PMK. This was leaking
uninitialized stack contents to the device.
Comment 1 Jon Moroney 2025-10-22 16:08:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025102213-CVE-2023-53715-fd47@gregkh/T