linux-cve-announce - CVE-2025-38647: wifi: rtw89: sar: drop lockdep assertion in rtw89_set_sar_from

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Message-ID: <2025082236-CVE-2025-38647-af0d@gregkh>
Date: Fri, 22 Aug 2025 18:00:55 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38647: wifi: rtw89: sar: drop lockdep assertion in rtw89_set_sar_from_acpi

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

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

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

wifi: rtw89: sar: drop lockdep assertion in rtw89_set_sar_from_acpi

The following assertion is triggered on the rtw89 driver startup. It
looks meaningless to hold wiphy lock on the early init stage so drop the
assertion.

 WARNING: CPU: 7 PID: 629 at drivers/net/wireless/realtek/rtw89/sar.c:502 rtw89_set_sar_from_acpi+0x365/0x4d0 [rtw89_core]
 CPU: 7 UID: 0 PID: 629 Comm: (udev-worker) Not tainted 6.15.0+ #29 PREEMPT(lazy)
 Hardware name: LENOVO 21D0/LNVNB161216, BIOS J6CN50WW 09/27/2024
 RIP: 0010:rtw89_set_sar_from_acpi+0x365/0x4d0 [rtw89_core]
 Call Trace:
  <TASK>
  rtw89_sar_init+0x68/0x2c0 [rtw89_core]
  rtw89_core_init+0x188e/0x1e50 [rtw89_core]
  rtw89_pci_probe+0x530/0xb50 [rtw89_pci]
  local_pci_probe+0xd9/0x190
  pci_call_probe+0x183/0x540
  pci_device_probe+0x171/0x2c0
  really_probe+0x1e1/0x890
  __driver_probe_device+0x18c/0x390
  driver_probe_device+0x4a/0x120
  __driver_attach+0x1a0/0x530
  bus_for_each_dev+0x10b/0x190
  bus_add_driver+0x2eb/0x540
  driver_register+0x1a3/0x3a0
  do_one_initcall+0xd5/0x450
  do_init_module+0x2cc/0x8f0
  init_module_from_file+0xe1/0x150
  idempotent_init_module+0x226/0x760
  __x64_sys_finit_module+0xcd/0x150
  do_syscall_64+0x94/0x380
  entry_SYSCALL_64_after_hwframe+0x76/0x7e

Found by Linux Verification Center (linuxtesting.org).

The Linux kernel CVE team has assigned CVE-2025-38647 to this issue.


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

	Issue introduced in 6.16 with commit 88ca3107d2ce06448018e0571f7c0f1b40f57b55 and fixed in 6.16.1 with commit f7ac6df92eee030151476078069dc3eb0002dfb0
	Issue introduced in 6.16 with commit 88ca3107d2ce06448018e0571f7c0f1b40f57b55 and fixed in 6.17-rc1 with commit 6fe21445f7e801de5527d420f8e25e97b0cdd7e2

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-2025-38647
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/rtw89/sar.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/f7ac6df92eee030151476078069dc3eb0002dfb0
	https://git.kernel.org/stable/c/6fe21445f7e801de5527d420f8e25e97b0cdd7e2