CVE-2026-43386: staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm_ie

CVE-2026-43386: staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm_ie

[Greg Kroah-Hartman]

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

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

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

staging: rtl8723bs: fix potential out-of-bounds read in rtw_restruct_wmm_ie

The current code checks 'i + 5 < in_len' at the end of the if statement.
However, it accesses 'in_ie[i + 5]' before that check, which can lead
to an out-of-bounds read. Move the length check to the beginning of the
conditional to ensure the index is within bounds before accessing the
array.

The Linux kernel CVE team has assigned CVE-2026-43386 to this issue.


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

	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 5.10.253 with commit 6ff2243d5e05a5239e39d4ba61d96b0ea3bf7259
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 5.15.203 with commit 12cc6e8f8d4245b7b5a408c6fc8ab1d098d67020
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 6.1.167 with commit 209644e25757c499e1c1f08c071ea0386d4448b6
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 6.6.130 with commit 768f25613a9fe6766d15a4a72979657adfc1c6d8
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 6.12.78 with commit e14a1148f02e8cf1ca380d57e4b95ca36c97f45d
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 6.18.19 with commit 4dd2d9cf563c54e09d5f7eacf95c5b8f538b513b
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 6.19.9 with commit d97fc1b29513010b60fde874c7f0ba816744e18c
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 7.0 with commit a75281626fc8fa6dc6c9cc314ee423e8bc45203b

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-2026-43386
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/staging/rtl8723bs/core/rtw_mlme.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/6ff2243d5e05a5239e39d4ba61d96b0ea3bf7259
	https://git.kernel.org/stable/c/12cc6e8f8d4245b7b5a408c6fc8ab1d098d67020
	https://git.kernel.org/stable/c/209644e25757c499e1c1f08c071ea0386d4448b6
	https://git.kernel.org/stable/c/768f25613a9fe6766d15a4a72979657adfc1c6d8
	https://git.kernel.org/stable/c/e14a1148f02e8cf1ca380d57e4b95ca36c97f45d
	https://git.kernel.org/stable/c/4dd2d9cf563c54e09d5f7eacf95c5b8f538b513b
	https://git.kernel.org/stable/c/d97fc1b29513010b60fde874c7f0ba816744e18c
	https://git.kernel.org/stable/c/a75281626fc8fa6dc6c9cc314ee423e8bc45203b