CVE-2026-68439: wifi: mt76: mt7925: fix possible NULL-pointer deref in mt7925_mcu_bss_he_tlv()

From: Greg Kroah-Hartman <[email protected]>

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

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

wifi: mt76: mt7925: fix possible NULL-pointer deref in mt7925_mcu_bss_he_tlv()

mt76_connac_get_he_phy_cap routine can theoretically return NULL so
check cap pointer before dereferencing it.

The Linux kernel CVE team has assigned CVE-2026-68439 to this issue.


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

	Issue introduced in 6.7 with commit c948b5da6bbec742b433138e3e3f9537a85af2e5 and fixed in 6.12.101 with commit 42288cca984fb72ad3ebe43d4e7fdce9dcabfdb5
	Issue introduced in 6.7 with commit c948b5da6bbec742b433138e3e3f9537a85af2e5 and fixed in 6.18.42 with commit 313343ab8cab7417973e7bdd43d3c3e93044b447
	Issue introduced in 6.7 with commit c948b5da6bbec742b433138e3e3f9537a85af2e5 and fixed in 7.1.6 with commit 856f1588a2590e70b119e76c15315615a36aebc8
	Issue introduced in 6.7 with commit c948b5da6bbec742b433138e3e3f9537a85af2e5 and fixed in 7.2-rc5 with commit 8d1b6738c1ab48c086b17e7994034aca94258931

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-2026-68439
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/mediatek/mt76/mt7925/mcu.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/42288cca984fb72ad3ebe43d4e7fdce9dcabfdb5
	https://git.kernel.org/stable/c/313343ab8cab7417973e7bdd43d3c3e93044b447
	https://git.kernel.org/stable/c/856f1588a2590e70b119e76c15315615a36aebc8
	https://git.kernel.org/stable/c/8d1b6738c1ab48c086b17e7994034aca94258931