linux-cve-announce - CVE-2022-49539: rtw89: ser: fix CAM leaks occurring in L2 reset

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Message-ID: <2025022614-CVE-2022-49539-9ea2@gregkh>
Date: Wed, 26 Feb 2025 03:13:33 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49539: rtw89: ser: fix CAM leaks occurring in L2 reset

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

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

rtw89: ser: fix CAM leaks occurring in L2 reset

The CAM, meaning address CAM and bssid CAM here, will get leaks during
SER (system error recover) L2 reset process and ieee80211_restart_hw()
which is called by L2 reset process eventually.

The normal flow would be like
-> add interface (acquire 1)
-> enter ips (release 1)
-> leave ips (acquire 1)
-> connection (occupy 1) <(A) 1 leak after L2 reset if non-sec connection>

The ieee80211_restart_hw() flow (under connection)
-> ieee80211 reconfig
-> add interface (acquire 1)
-> leave ips (acquire 1)
-> connection (occupy (A) + 2) <(B) 1 more leak>

Originally, CAM is released before HW restart only if connection is under
security. Now, release CAM whatever connection it is to fix leak in (A).
OTOH, check if CAM is already valid to avoid acquiring multiple times to
fix (B).

Besides, if AP mode, release address CAM of all stations before HW restart.

The Linux kernel CVE team has assigned CVE-2022-49539 to this issue.


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

	Fixed in 5.18.3 with commit f6aff772c9978844529618d86aafb53e5d3ae161
	Fixed in 5.19 with commit b169f877f001a474fb89939842c390518160bcc5

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-2022-49539
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/realtek/rtw89/cam.c
	drivers/net/wireless/realtek/rtw89/ser.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/f6aff772c9978844529618d86aafb53e5d3ae161
	https://git.kernel.org/stable/c/b169f877f001a474fb89939842c390518160bcc5