CVE-2026-68190: staging: rtl8723bs: fix OOB reads in rtw_get_wps_ie()

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

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

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

staging: rtl8723bs: fix OOB reads in rtw_get_wps_ie()

rtw_get_wps_ie() iterates over IE data from network frames without
validating that the IE header and payload fit within the remaining
buffer before reading them. Specifically:

- in_ie[cnt + 1] is read without checking cnt + 1 < in_len
- memcmp(&in_ie[cnt + 2], ...) accesses cnt + 2 without bounds check
- in_ie[cnt + 1] is used as length without verifying payload fits

Add bounds checks at the top of the loop body to break early if fewer
than 2 bytes remain for the IE header, or if the declared payload
extends past the end of the buffer. Also require at least 4 bytes of
payload before comparing the WPS OUI.

The Linux kernel CVE team has assigned CVE-2026-68190 to this issue.


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

	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 6.6.148 with commit b9d9a4cd2e59df7281992a076464d2536e80c674
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 6.12.101 with commit 630fdca3f2437fee3ffd437c4b646ccf84c7be87
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 6.18.42 with commit 875479f18835ac11e21a83e88f3d4dc7ccdcd0c4
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 7.1.6 with commit 23c31f107b4f8f420a754a45d12599bdb78f9bb8
	Issue introduced in 4.12 with commit 554c0a3abf216c991c5ebddcdb2c08689ecd290b and fixed in 7.2-rc5 with commit 0e95ff792ae0aa6fbad9455943e9e1e4062670e9

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-2026-68190
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_ieee80211.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/b9d9a4cd2e59df7281992a076464d2536e80c674
	https://git.kernel.org/stable/c/630fdca3f2437fee3ffd437c4b646ccf84c7be87
	https://git.kernel.org/stable/c/875479f18835ac11e21a83e88f3d4dc7ccdcd0c4
	https://git.kernel.org/stable/c/23c31f107b4f8f420a754a45d12599bdb78f9bb8
	https://git.kernel.org/stable/c/0e95ff792ae0aa6fbad9455943e9e1e4062670e9