linux-cve-announce - CVE-2025-38132: coresight: holding cscfg_csdev

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Message-ID: <2025070331-CVE-2025-38132-bfc9@gregkh>
Date: Thu,  3 Jul 2025 10:35:49 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38132: coresight: holding cscfg_csdev_lock while removing cscfg from csdev

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

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

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

coresight: holding cscfg_csdev_lock while removing cscfg from csdev

There'll be possible race scenario for coresight config:

CPU0                                          CPU1
(perf enable)                                 load module
                                              cscfg_load_config_sets()
                                              activate config. // sysfs
                                              (sys_active_cnt == 1)
...
cscfg_csdev_enable_active_config()
  lock(csdev->cscfg_csdev_lock)
                                              deactivate config // sysfs
                                              (sys_activec_cnt == 0)
                                              cscfg_unload_config_sets()
  <iterating config_csdev_list>               cscfg_remove_owned_csdev_configs()
  // here load config activate by CPU1
  unlock(csdev->cscfg_csdev_lock)

iterating config_csdev_list could be raced with config_csdev_list's
entry delete.

To resolve this race , hold csdev->cscfg_csdev_lock() while
cscfg_remove_owned_csdev_configs()

The Linux kernel CVE team has assigned CVE-2025-38132 to this issue.


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

	Issue introduced in 5.17 with commit 02bd588e12df405bdf55244708151b7f238b79ba and fixed in 6.15.3 with commit 42f8afb0b161631fd1d814d017f75f955475ad41
	Issue introduced in 5.17 with commit 02bd588e12df405bdf55244708151b7f238b79ba and fixed in 6.16-rc1 with commit 53b9e2659719b04f5ba7593f2af0f2335f75e94a

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-2025-38132
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/hwtracing/coresight/coresight-syscfg.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/42f8afb0b161631fd1d814d017f75f955475ad41
	https://git.kernel.org/stable/c/53b9e2659719b04f5ba7593f2af0f2335f75e94a