CVE-2026-74341: wifi: wcn36xx: fix heap overflow from oversized firmware HAL response

CVE-2026-74341: wifi: wcn36xx: fix heap overflow from oversized firmware HAL response

[Greg Kroah-Hartman]

From: Greg Kroah-Hartman <gregkh@kernel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

wifi: wcn36xx: fix heap overflow from oversized firmware HAL response

The firmware response dispatcher copies all synchronous HAL responses
into the 4096-byte hal_buf without validating the response length. A
response exceeding WCN36XX_HAL_BUF_SIZE causes a heap buffer overflow
with firmware-controlled content.

Add a bounds check on the response length.

The Linux kernel CVE team has assigned CVE-2026-74341 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 3.13 with commit 8e84c25821698bdef73c0329fb2022a4673b7adc and fixed in 6.1.178 with commit dae9cadf0925f1cbfb71306d60490890df3870a6
	Issue introduced in 3.13 with commit 8e84c25821698bdef73c0329fb2022a4673b7adc and fixed in 6.6.145 with commit cfc67aee0c83e7f5d43a1dad3e25c789e9cc1d92
	Issue introduced in 3.13 with commit 8e84c25821698bdef73c0329fb2022a4673b7adc and fixed in 6.12.97 with commit 15545ee71301e82d26d9a31b407ed0019eb62a60
	Issue introduced in 3.13 with commit 8e84c25821698bdef73c0329fb2022a4673b7adc and fixed in 6.18.40 with commit 1b5d8a248c3afa640bcc99fa95abcd1e36f3ee18
	Issue introduced in 3.13 with commit 8e84c25821698bdef73c0329fb2022a4673b7adc and fixed in 7.1.5 with commit 18813b90032bfaafb225906a4d2b51be4dfc02c3
	Issue introduced in 3.13 with commit 8e84c25821698bdef73c0329fb2022a4673b7adc and fixed in 7.2-rc1 with commit 88a240d86d3d64521f9194abe185ac71cc74d0bd

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-74341
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	drivers/net/wireless/ath/wcn36xx/smd.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/dae9cadf0925f1cbfb71306d60490890df3870a6
	https://git.kernel.org/stable/c/cfc67aee0c83e7f5d43a1dad3e25c789e9cc1d92
	https://git.kernel.org/stable/c/15545ee71301e82d26d9a31b407ed0019eb62a60
	https://git.kernel.org/stable/c/1b5d8a248c3afa640bcc99fa95abcd1e36f3ee18
	https://git.kernel.org/stable/c/18813b90032bfaafb225906a4d2b51be4dfc02c3
	https://git.kernel.org/stable/c/88a240d86d3d64521f9194abe185ac71cc74d0bd