linux-cve-announce - CVE-2025-71234: wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta

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Message-ID: <2026021805-CVE-2025-71234-3bb7@gregkh>
Date: Wed, 18 Feb 2026 15:54:05 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-71234: wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add

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

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

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

wifi: rtl8xxxu: fix slab-out-of-bounds in rtl8xxxu_sta_add

The driver does not set hw->sta_data_size, which causes mac80211 to
allocate insufficient space for driver private station data in
__sta_info_alloc(). When rtl8xxxu_sta_add() accesses members of
struct rtl8xxxu_sta_info through sta->drv_priv, this results in a
slab-out-of-bounds write.

KASAN report on RISC-V (VisionFive 2) with RTL8192EU adapter:

  BUG: KASAN: slab-out-of-bounds in rtl8xxxu_sta_add+0x31c/0x346
  Write of size 8 at addr ffffffd6d3e9ae88 by task kworker/u16:0/12

Set hw->sta_data_size to sizeof(struct rtl8xxxu_sta_info) during
probe, similar to how hw->vif_data_size is configured. This ensures
mac80211 allocates sufficient space for the driver's per-station
private data.

Tested on StarFive VisionFive 2 v1.2A board.

The Linux kernel CVE team has assigned CVE-2025-71234 to this issue.


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

	Fixed in 6.12.72 with commit 5d810ba377eddee95d30766d360a14efbb3d1872
	Fixed in 6.18.11 with commit 116f7bd8160c6b37d1c6939385abf90f6f6ed2f5
	Fixed in 6.19.1 with commit 9a0f3fa6ecd0c9c32dbc367a57482bbf7c7d25bf

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-2025-71234
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/realtek/rtl8xxxu/core.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/5d810ba377eddee95d30766d360a14efbb3d1872
	https://git.kernel.org/stable/c/116f7bd8160c6b37d1c6939385abf90f6f6ed2f5
	https://git.kernel.org/stable/c/9a0f3fa6ecd0c9c32dbc367a57482bbf7c7d25bf
	https://git.kernel.org/stable/c/86c946bcc00f6390ef65e9614ae60a9377e454f8