CVE-2026-98822: wifi: mac80211: prevent AP VLAN tx from other interfaces

CVE-2026-98822: wifi: mac80211: prevent AP VLAN tx from other interfaces

[Greg Kroah-Hartman]

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

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

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

wifi: mac80211: prevent AP VLAN tx from other interfaces

Since the station lookup was factored out of ieee80211_build_hdr(),
ieee80211_lookup_ra_sta() uses sta_info_get_bss() for all AP and AP VLAN
frames, not only for control port frames. A unicast frame sent on one
interface thus matches a station of a different VLAN of the same BSS and
is transmitted to it.

Only match stations of the interface the frame is sent on, except for
control port frames, since those may be sent for VLAN stations directly
on the BSS interface.

The Linux kernel CVE team has assigned CVE-2026-98822 to this issue.


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

	Issue introduced in 4.1 with commit 97ffe75791b3e9c0797d5891070e41321c3beccb and fixed in 6.12.113 with commit fd875e24e8f2b202e3636b3ef8e6060874eca0e5
	Issue introduced in 4.1 with commit 97ffe75791b3e9c0797d5891070e41321c3beccb and fixed in 6.18.56 with commit 88e96d902efeefbffc34450969f40dc61a0c8a42
	Issue introduced in 4.1 with commit 97ffe75791b3e9c0797d5891070e41321c3beccb and fixed in 7.2.10 with commit ad61b9a5febb42e4b96df8d30ad76ddc36dda9d0
	Issue introduced in 4.1 with commit 97ffe75791b3e9c0797d5891070e41321c3beccb and fixed in 7.3-rc6 with commit 7f93ca31f7fd9b42e7d692f59514436d448ac908

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-2026-98822
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:
	net/mac80211/ieee80211_i.h
	net/mac80211/tx.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/fd875e24e8f2b202e3636b3ef8e6060874eca0e5
	https://git.kernel.org/stable/c/88e96d902efeefbffc34450969f40dc61a0c8a42
	https://git.kernel.org/stable/c/ad61b9a5febb42e4b96df8d30ad76ddc36dda9d0
	https://git.kernel.org/stable/c/7f93ca31f7fd9b42e7d692f59514436d448ac908