linux-cve-announce - CVE-2025-37743: wifi: ath12k: Avoid memory leak while enabling statistics

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Message-ID: <2025050134-CVE-2025-37743-35a7@gregkh>
Date: Thu,  1 May 2025 14:56:49 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37743: wifi: ath12k: Avoid memory leak while enabling statistics

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

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

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

wifi: ath12k: Avoid memory leak while enabling statistics

Driver uses monitor destination rings for extended statistics mode and
standalone monitor mode. In extended statistics mode, TLVs are parsed from
the buffer received from the monitor destination ring and assigned to the
ppdu_info structure to update per-packet statistics. In standalone monitor
mode, along with per-packet statistics, the packet data (payload) is
captured, and the driver updates per MSDU to mac80211.

When the AP interface is enabled, only extended statistics mode is
activated. As part of enabling monitor rings for collecting statistics,
the driver subscribes to HAL_RX_MPDU_START TLV in the filter
configuration. This TLV is received from the monitor destination ring, and
kzalloc for the mon_mpdu object occurs, which is not freed, leading to a
memory leak. The kzalloc for the mon_mpdu object is only required while
enabling the standalone monitor interface. This causes a memory leak while
enabling extended statistics mode in the driver.

Fix this memory leak by removing the kzalloc for the mon_mpdu object in
the HAL_RX_MPDU_START TLV handling. Additionally, remove the standalone
monitor mode handlings in the HAL_MON_BUF_ADDR and HAL_RX_MSDU_END TLVs.
These TLV tags will be handled properly when enabling standalone monitor
mode in the future.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3

The Linux kernel CVE team has assigned CVE-2025-37743 to this issue.

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

	Fixed in 6.14.3 with commit 286bab0fc7b9db728dab8c63cadf6be9b3facf8c
	Fixed in 6.15-rc1 with commit ecfc131389923405be8e7a6f4408fd9321e4d19b

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-2025-37743
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/ath/ath12k/dp_mon.c
	drivers/net/wireless/ath/ath12k/hal_rx.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/286bab0fc7b9db728dab8c63cadf6be9b3facf8c
	https://git.kernel.org/stable/c/ecfc131389923405be8e7a6f4408fd9321e4d19b