linux-cve-announce - CVE-2025-38649: arm64: dts: qcom: qcs615: fix a crash issue caused by infinite loop for Coresight

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Message-ID: <2025082236-CVE-2025-38649-9023@gregkh>
Date: Fri, 22 Aug 2025 18:00:57 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38649: arm64: dts: qcom: qcs615: fix a crash issue caused by infinite loop for Coresight

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

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

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

arm64: dts: qcom: qcs615: fix a crash issue caused by infinite loop for Coresight

An infinite loop has been created by the Coresight devices. When only a
source device is enabled, the coresight_find_activated_sysfs_sink function
is recursively invoked in an attempt to locate an active sink device,
ultimately leading to a stack overflow and system crash. Therefore, disable
the replicator1 to break the infinite loop and prevent a potential stack
overflow.

replicator1_out   ->   funnel_swao_in6   ->   tmc_etf_swao_in   ->  tmc_etf_swao_out
     |                                                                     |
replicator1_in                                                     replicator_swao_in
     |                                                                     |
replicator0_out1                                                   replicator_swao_out0
     |                                                                     |
replicator0_in                                                     funnel_in1_in3
     |                                                                     |
tmc_etf_out <- tmc_etf_in <- funnel_merg_out <- funnel_merg_in1 <- funnel_in1_out

[call trace]
   dump_backtrace+0x9c/0x128
   show_stack+0x20/0x38
   dump_stack_lvl+0x48/0x60
   dump_stack+0x18/0x28
   panic+0x340/0x3b0
   nmi_panic+0x94/0xa0
   panic_bad_stack+0x114/0x138
   handle_bad_stack+0x34/0xb8
   __bad_stack+0x78/0x80
   coresight_find_activated_sysfs_sink+0x28/0xa0 [coresight]
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   ...
   coresight_find_activated_sysfs_sink+0x5c/0xa0 [coresight]
   coresight_enable_sysfs+0x80/0x2a0 [coresight]

side effect after the change:
Only trace data originating from AOSS can reach the ETF_SWAO and EUD sinks.

The Linux kernel CVE team has assigned CVE-2025-38649 to this issue.

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

	Issue introduced in 6.14 with commit bf469630552a3950d0370dd5fd1f9bf0145d09d5 and fixed in 6.15.10 with commit a9aaadcb0a6ce0c19616c46525112bc947c6f2b1
	Issue introduced in 6.14 with commit bf469630552a3950d0370dd5fd1f9bf0145d09d5 and fixed in 6.16.1 with commit fbe5be7893b8c7f58c999a26839cd30bc07654c6
	Issue introduced in 6.14 with commit bf469630552a3950d0370dd5fd1f9bf0145d09d5 and fixed in 6.17-rc1 with commit bd4f35786d5f0798cc1f8c187a81a7c998e6c58f

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-2025-38649
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:
	arch/arm64/boot/dts/qcom/qcs615.dtsi

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/a9aaadcb0a6ce0c19616c46525112bc947c6f2b1
	https://git.kernel.org/stable/c/fbe5be7893b8c7f58c999a26839cd30bc07654c6
	https://git.kernel.org/stable/c/bd4f35786d5f0798cc1f8c187a81a7c998e6c58f