CVE-2026-68471: wifi: ieee80211: validate MLE common info length

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

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

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

wifi: ieee80211: validate MLE common info length

ieee80211_mle_common_size() uses the first common-info octet as the
common information length for all known MLE types. However,
ieee80211_mle_size_ok() only validates that octet for Basic, Probe
Request, and TDLS MLEs.

Reconfiguration MLEs also skipped the length octet when calculating the
minimum common size, and Priority Access MLEs skipped validation of the
advertised common information length.

Account for the Reconfiguration common-info length octet and validate
the advertised common information length for all known MLE types. Keep
unknown-type handling unchanged.

[remove now misleading comment]

The Linux kernel CVE team has assigned CVE-2026-68471 to this issue.


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

	Issue introduced in 6.0 with commit 0f48b8b88aa9ed7b65d7cb55dbc57ec914ddada1 and fixed in 6.18.40 with commit 90576bd6921a91eb038bffbb4b9467c2dc26aa1d
	Issue introduced in 6.0 with commit 0f48b8b88aa9ed7b65d7cb55dbc57ec914ddada1 and fixed in 7.1.5 with commit 2b1589fd9a076727a73bfb39e96622a76415ad32
	Issue introduced in 6.0 with commit 0f48b8b88aa9ed7b65d7cb55dbc57ec914ddada1 and fixed in 7.2-rc4 with commit 293baeae9b2434a3e432629d7720b5603db2d77e

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-2026-68471
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:
	include/linux/ieee80211-eht.h


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/90576bd6921a91eb038bffbb4b9467c2dc26aa1d
	https://git.kernel.org/stable/c/2b1589fd9a076727a73bfb39e96622a76415ad32
	https://git.kernel.org/stable/c/293baeae9b2434a3e432629d7720b5603db2d77e