linux-cve-announce - CVE-2025-68182: wifi: iwlwifi: fix potential use after free in iwl_mld_remove

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Message-ID: <2025121632-CVE-2025-68182-87b4@gregkh>
Date: Tue, 16 Dec 2025 14:43:43 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68182: wifi: iwlwifi: fix potential use after free in iwl_mld_remove_link()

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

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

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

wifi: iwlwifi: fix potential use after free in iwl_mld_remove_link()

This code frees "link" by calling kfree_rcu(link, rcu_head) and then it
dereferences "link" to get the "link->fw_id".  Save the "link->fw_id"
first to avoid a potential use after free.

The Linux kernel CVE team has assigned CVE-2025-68182 to this issue.


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

	Issue introduced in 6.15 with commit d1e879ec600f9b3bdd253167533959facfefb17b and fixed in 6.17.8 with commit 5b4a239c9f94e1606435f1842fc6fd426d607dbb
	Issue introduced in 6.15 with commit d1e879ec600f9b3bdd253167533959facfefb17b and fixed in 6.18 with commit 77e67d5daaf155f7d0f99f4e797c4842169ec19e

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-2025-68182
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/intel/iwlwifi/mld/link.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/5b4a239c9f94e1606435f1842fc6fd426d607dbb
	https://git.kernel.org/stable/c/77e67d5daaf155f7d0f99f4e797c4842169ec19e