linux-cve-announce - CVE-2025-38178: EDAC/igen6: Fix NULL pointer dereference

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Message-ID: <2025070407-CVE-2025-38178-8846@gregkh>
Date: Fri,  4 Jul 2025 15:37:07 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38178: EDAC/igen6: Fix NULL pointer dereference

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

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

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

EDAC/igen6: Fix NULL pointer dereference

A kernel panic was reported with the following kernel log:

  EDAC igen6: Expected 2 mcs, but only 1 detected.
  BUG: unable to handle page fault for address: 000000000000d570
  ...
  Hardware name: Notebook V54x_6x_TU/V54x_6x_TU, BIOS Dasharo (coreboot+UEFI) v0.9.0 07/17/2024
  RIP: e030:ecclog_handler+0x7e/0xf0 [igen6_edac]
  ...
  igen6_probe+0x2a0/0x343 [igen6_edac]
  ...
  igen6_init+0xc5/0xff0 [igen6_edac]
  ...

This issue occurred because one memory controller was disabled by
the BIOS but the igen6_edac driver still checked all the memory
controllers, including this absent one, to identify the source of
the error. Accessing the null MMIO for the absent memory controller
resulted in the oops above.

Fix this issue by reverting the configuration structure to non-const
and updating the field 'res_cfg->num_imc' to reflect the number of
detected memory controllers.

The Linux kernel CVE team has assigned CVE-2025-38178 to this issue.

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

	Issue introduced in 6.16-rc1 with commit 20e190b1c1fd88b21cc5106c12cfe6def5ab849d and fixed in 6.16-rc3 with commit 88efa0de3285be66969b71ec137d9dab1ee19e52

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-2025-38178
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/edac/igen6_edac.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/40e69c93d6dadc5355bfe90f3940c402d171289c
	https://git.kernel.org/stable/c/88efa0de3285be66969b71ec137d9dab1ee19e52