CVE-2026-68306: wifi: mt76: mt7996: fix possible NULL-pointer deref in mt7996_mcu_sta_bfer_eht()

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

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

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

wifi: mt76: mt7996: fix possible NULL-pointer deref in mt7996_mcu_sta_bfer_eht()

mt76_connac_get_eht_phy_cap routine can theoretically return NULL so
check cap pointer before dereferencing it.

The Linux kernel CVE team has assigned CVE-2026-68306 to this issue.


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

	Issue introduced in 6.3 with commit ba01944adee9f4a71cf2879b9529057fd8de1972 and fixed in 6.6.148 with commit 2b1882cf313ae44181146629b3578a7826c672c9
	Issue introduced in 6.3 with commit ba01944adee9f4a71cf2879b9529057fd8de1972 and fixed in 6.12.101 with commit 3e4f848f4a620e1d77c38459e73cf3b362f7bc6b
	Issue introduced in 6.3 with commit ba01944adee9f4a71cf2879b9529057fd8de1972 and fixed in 6.18.42 with commit d5628f39fccc107dca00b98a491d9848898599f7
	Issue introduced in 6.3 with commit ba01944adee9f4a71cf2879b9529057fd8de1972 and fixed in 7.1.6 with commit 45c496756c6f6df6c3aeb5b2cb996993d2f14687
	Issue introduced in 6.3 with commit ba01944adee9f4a71cf2879b9529057fd8de1972 and fixed in 7.2-rc5 with commit 2fffc472bec490c8357defcee9c075ca74467352

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-2026-68306
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/mt7996/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/2b1882cf313ae44181146629b3578a7826c672c9
	https://git.kernel.org/stable/c/3e4f848f4a620e1d77c38459e73cf3b362f7bc6b
	https://git.kernel.org/stable/c/d5628f39fccc107dca00b98a491d9848898599f7
	https://git.kernel.org/stable/c/45c496756c6f6df6c3aeb5b2cb996993d2f14687
	https://git.kernel.org/stable/c/2fffc472bec490c8357defcee9c075ca74467352