linux-cve-announce - CVE-2025-22107: net: dsa: sja1105: fix kasan out-of-bounds warning in sja1105_table_delete

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Message-ID: <2025041623-CVE-2025-22107-1266@gregkh>
Date: Wed, 16 Apr 2025 16:13:18 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22107: net: dsa: sja1105: fix kasan out-of-bounds warning in sja1105_table_delete_entry()

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

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

net: dsa: sja1105: fix kasan out-of-bounds warning in sja1105_table_delete_entry()

There are actually 2 problems:
- deleting the last element doesn't require the memmove of elements
  [i + 1, end) over it. Actually, element i+1 is out of bounds.
- The memmove itself should move size - i - 1 elements, because the last
  element is out of bounds.

The out-of-bounds element still remains out of bounds after being
accessed, so the problem is only that we touch it, not that it becomes
in active use. But I suppose it can lead to issues if the out-of-bounds
element is part of an unmapped page.

The Linux kernel CVE team has assigned CVE-2025-22107 to this issue.


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

	Issue introduced in 5.2 with commit 6666cebc5e306f49a25bd20aa8c1cb8ef8950df5 and fixed in 6.14.2 with commit 59b97641de03c081f26b3a8876628c765b5faa25
	Issue introduced in 5.2 with commit 6666cebc5e306f49a25bd20aa8c1cb8ef8950df5 and fixed in 6.15-rc1 with commit 5f2b28b79d2d1946ee36ad8b3dc0066f73c90481

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-2025-22107
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/dsa/sja1105/sja1105_static_config.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/59b97641de03c081f26b3a8876628c765b5faa25
	https://git.kernel.org/stable/c/5f2b28b79d2d1946ee36ad8b3dc0066f73c90481