linux-cve-announce - CVE-2025-39689: ftrace: Also allocate and copy hash for reading of filter files

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Message-ID: <2025090546-CVE-2025-39689-f538@gregkh>
Date: Fri,  5 Sep 2025 19:21:02 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39689: ftrace: Also allocate and copy hash for reading of filter files

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

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

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

ftrace: Also allocate and copy hash for reading of filter files

Currently the reader of set_ftrace_filter and set_ftrace_notrace just adds
the pointer to the global tracer hash to its iterator. Unlike the writer
that allocates a copy of the hash, the reader keeps the pointer to the
filter hashes. This is problematic because this pointer is static across
function calls that release the locks that can update the global tracer
hashes. This can cause UAF and similar bugs.

Allocate and copy the hash for reading the filter files like it is done
for the writers. This not only fixes UAF bugs, but also makes the code a
bit simpler as it doesn't have to differentiate when to free the
iterator's hash between writers and readers.

The Linux kernel CVE team has assigned CVE-2025-39689 to this issue.


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

	Issue introduced in 4.12 with commit c20489dad156dd9919ebd854bbace46dbd2576a3 and fixed in 5.4.297 with commit 12064e1880fc9202be75ff668205b1703d92f74f
	Issue introduced in 4.12 with commit c20489dad156dd9919ebd854bbace46dbd2576a3 and fixed in 5.10.241 with commit c4cd93811e038d19f961985735ef7bb128078dfb
	Issue introduced in 4.12 with commit c20489dad156dd9919ebd854bbace46dbd2576a3 and fixed in 5.15.190 with commit e0b6b223167e1edde5c82edf38e393c06eda1f13
	Issue introduced in 4.12 with commit c20489dad156dd9919ebd854bbace46dbd2576a3 and fixed in 6.1.149 with commit a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309
	Issue introduced in 4.12 with commit c20489dad156dd9919ebd854bbace46dbd2576a3 and fixed in 6.6.103 with commit 3b114a3282ab1a12cb4618a8f45db5d7185e784a
	Issue introduced in 4.12 with commit c20489dad156dd9919ebd854bbace46dbd2576a3 and fixed in 6.12.44 with commit c591ba1acd081d4980713e47869dd1cc3d963d19
	Issue introduced in 4.12 with commit c20489dad156dd9919ebd854bbace46dbd2576a3 and fixed in 6.16.4 with commit 64db338140d2bad99a0a8c6a118dd60b3e1fb8cb
	Issue introduced in 4.12 with commit c20489dad156dd9919ebd854bbace46dbd2576a3 and fixed in 6.17-rc3 with commit bfb336cf97df7b37b2b2edec0f69773e06d11955

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-2025-39689
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:
	kernel/trace/ftrace.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/12064e1880fc9202be75ff668205b1703d92f74f
	https://git.kernel.org/stable/c/c4cd93811e038d19f961985735ef7bb128078dfb
	https://git.kernel.org/stable/c/e0b6b223167e1edde5c82edf38e393c06eda1f13
	https://git.kernel.org/stable/c/a40c69f4f1ed96acbcd62e9b5ff3a596f0a91309
	https://git.kernel.org/stable/c/3b114a3282ab1a12cb4618a8f45db5d7185e784a
	https://git.kernel.org/stable/c/c591ba1acd081d4980713e47869dd1cc3d963d19
	https://git.kernel.org/stable/c/64db338140d2bad99a0a8c6a118dd60b3e1fb8cb
	https://git.kernel.org/stable/c/bfb336cf97df7b37b2b2edec0f69773e06d11955