linux-cve-announce - CVE-2025-22104: ibmvnic: Use kernel helpers for hex dumps

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Message-ID: <2025041622-CVE-2025-22104-0a82@gregkh>
Date: Wed, 16 Apr 2025 16:13:15 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22104: ibmvnic: Use kernel helpers for hex dumps

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

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

ibmvnic: Use kernel helpers for hex dumps

Previously, when the driver was printing hex dumps, the buffer was cast
to an 8 byte long and printed using string formatters. If the buffer
size was not a multiple of 8 then a read buffer overflow was possible.

Therefore, create a new ibmvnic function that loops over a buffer and
calls hex_dump_to_buffer instead.

This patch address KASAN reports like the one below:
  ibmvnic 30000003 env3: Login Buffer:
  ibmvnic 30000003 env3: 01000000af000000
  <...>
  ibmvnic 30000003 env3: 2e6d62692e736261
  ibmvnic 30000003 env3: 65050003006d6f63
  ==================================================================
  BUG: KASAN: slab-out-of-bounds in ibmvnic_login+0xacc/0xffc [ibmvnic]
  Read of size 8 at addr c0000001331a9aa8 by task ip/17681
  <...>
  Allocated by task 17681:
  <...>
  ibmvnic_login+0x2f0/0xffc [ibmvnic]
  ibmvnic_open+0x148/0x308 [ibmvnic]
  __dev_open+0x1ac/0x304
  <...>
  The buggy address is located 168 bytes inside of
                allocated 175-byte region [c0000001331a9a00, c0000001331a9aaf)
  <...>
  =================================================================
  ibmvnic 30000003 env3: 000000000033766e

The Linux kernel CVE team has assigned CVE-2025-22104 to this issue.


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

	Issue introduced in 4.5 with commit 032c5e82847a2214c3196a90f0aeba0ce252de58 and fixed in 6.14.2 with commit ae6b1d6c1acee3a2000394d83ec9f1028321e207
	Issue introduced in 4.5 with commit 032c5e82847a2214c3196a90f0aeba0ce252de58 and fixed in 6.15-rc1 with commit d93a6caab5d7d9b5ce034d75b1e1e993338e3852

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-2025-22104
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/ethernet/ibm/ibmvnic.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/ae6b1d6c1acee3a2000394d83ec9f1028321e207
	https://git.kernel.org/stable/c/d93a6caab5d7d9b5ce034d75b1e1e993338e3852