linux-cve-announce - CVE-2025-40228: mm/damon/sysfs: catch commit test ctx alloc failure

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Message-ID: <2025120459-CVE-2025-40228-f581@gregkh>
Date: Thu,  4 Dec 2025 16:32:03 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40228: mm/damon/sysfs: catch commit test ctx alloc failure

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

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

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

mm/damon/sysfs: catch commit test ctx alloc failure

Patch series "mm/damon/sysfs: fix commit test damon_ctx [de]allocation".

DAMON sysfs interface dynamically allocates and uses a damon_ctx object
for testing if given inputs for online DAMON parameters update is valid.
The object is being used without an allocation failure check, and leaked
when the test succeeds.  Fix the two bugs.

This patch (of 2):

The damon_ctx for testing online DAMON parameters commit inputs is used
without its allocation failure check.  This could result in an invalid
memory access.  Fix it by directly returning an error when the allocation
failed.

The Linux kernel CVE team has assigned CVE-2025-40228 to this issue.

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

	Issue introduced in 6.15 with commit 4c9ea539ad59ec60676930dacee02b7adde2e0c0 and fixed in 6.17.6 with commit 5b3609d9b9650bdea0bfdf643e0ce57e1aed67fc
	Issue introduced in 6.15 with commit 4c9ea539ad59ec60676930dacee02b7adde2e0c0 and fixed in 6.18 with commit f0c5118ebb0eb7e4fd6f0d2ace3315ca141b317f

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-2025-40228
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:
	mm/damon/sysfs.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/5b3609d9b9650bdea0bfdf643e0ce57e1aed67fc
	https://git.kernel.org/stable/c/f0c5118ebb0eb7e4fd6f0d2ace3315ca141b317f