CVE-2026-43144
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Kernel Oops in Broadcom WiFi SDIO Driver

Publication date: 2026-05-06

Last updated on: 2026-05-06

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Fix potential kernel oops when probe fails When probe of the sdio brcmfmac device fails for some reasons (i.e. missing firmware), the sdiodev->bus is set to error instead of NULL, thus the cleanup later in brcmf_sdio_remove() tries to free resources via invalid bus pointer. This happens because sdiodev->bus is set 2 times: first in brcmf_sdio_probe() and second time in brcmf_sdiod_probe(). Fix this by chaning the brcmf_sdio_probe() function to return the error code and set sdio->bus only there.

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Meta Information

Published
2026-05-06
Last Modified
2026-05-06
Generated
2026-07-06
AI Q&A
2026-05-06
EPSS Evaluated
2026-07-05
NVD
CVE-2026-43144
EUVD
EUVD-2026-27706

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux_kernel brcmfmac *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability occurs in the Linux kernel's brcmfmac wifi driver related to the sdio device probe process. When the probe of the sdio brcmfmac device fails, for example due to missing firmware, the device's bus pointer is incorrectly set to an error value instead of NULL. Later, during cleanup, the driver attempts to free resources using this invalid bus pointer, which can cause a kernel oops (a type of kernel crash). The issue arises because the bus pointer is set twice in different probe functions, and the fix involves changing the probe function to return an error code and set the bus pointer only once.

Impact Analysis

This vulnerability can cause the Linux kernel to crash (kernel oops) when the brcmfmac wifi device probe fails. Such crashes can lead to system instability, unexpected reboots, or denial of service on affected systems using this wifi driver.

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