linux-cve-announce - CVE-2026-22978: wifi: avoid kernel-infoleak from struct iw

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Message-ID: <2026012347-CVE-2026-22978-4e34@gregkh>
Date: Fri, 23 Jan 2026 16:24:49 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-22978: wifi: avoid kernel-infoleak from struct iw_point

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

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

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

wifi: avoid kernel-infoleak from struct iw_point

struct iw_point has a 32bit hole on 64bit arches.

struct iw_point {
  void __user   *pointer;       /* Pointer to the data  (in user space) */
  __u16         length;         /* number of fields or size in bytes */
  __u16         flags;          /* Optional params */
};

Make sure to zero the structure to avoid disclosing 32bits of kernel data
to user space.

The Linux kernel CVE team has assigned CVE-2026-22978 to this issue.


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

	Issue introduced in 2.6.27 with commit 87de87d5e47f94b4ea647a5bd1bc8dc1f7930db4 and fixed in 5.10.248 with commit d943b5f592767b107ba8c12a902f17431350378c
	Issue introduced in 2.6.27 with commit 87de87d5e47f94b4ea647a5bd1bc8dc1f7930db4 and fixed in 5.15.198 with commit a3827e310b5a73535646ef4a552d53b3c8bf74f6
	Issue introduced in 2.6.27 with commit 87de87d5e47f94b4ea647a5bd1bc8dc1f7930db4 and fixed in 6.1.161 with commit 442ceac0393185e9982323f6682a52a53e8462b1
	Issue introduced in 2.6.27 with commit 87de87d5e47f94b4ea647a5bd1bc8dc1f7930db4 and fixed in 6.6.121 with commit d21ec867d84c9f3a9845d7d8c90c9ce35dbe48f8
	Issue introduced in 2.6.27 with commit 87de87d5e47f94b4ea647a5bd1bc8dc1f7930db4 and fixed in 6.12.66 with commit 024f71a57d563fbe162e528c8bf2d27e9cac7c7b
	Issue introduced in 2.6.27 with commit 87de87d5e47f94b4ea647a5bd1bc8dc1f7930db4 and fixed in 6.18.6 with commit e3c35177103ead4658b8a62f41e3080d45885464
	Issue introduced in 2.6.27 with commit 87de87d5e47f94b4ea647a5bd1bc8dc1f7930db4 and fixed in 6.19-rc5 with commit 21cbf883d073abbfe09e3924466aa5e0449e7261

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-2026-22978
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:
	net/wireless/wext-core.c
	net/wireless/wext-priv.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/d943b5f592767b107ba8c12a902f17431350378c
	https://git.kernel.org/stable/c/a3827e310b5a73535646ef4a552d53b3c8bf74f6
	https://git.kernel.org/stable/c/442ceac0393185e9982323f6682a52a53e8462b1
	https://git.kernel.org/stable/c/d21ec867d84c9f3a9845d7d8c90c9ce35dbe48f8
	https://git.kernel.org/stable/c/024f71a57d563fbe162e528c8bf2d27e9cac7c7b
	https://git.kernel.org/stable/c/e3c35177103ead4658b8a62f41e3080d45885464
	https://git.kernel.org/stable/c/21cbf883d073abbfe09e3924466aa5e0449e7261