CVE-2026-80643: EDAC/igen6: Fix call trace due to missing release()

CVE-2026-80643: EDAC/igen6: Fix call trace due to missing release()

[Greg Kroah-Hartman]

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

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

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

EDAC/igen6: Fix call trace due to missing release()

When unloading the igen6_edac driver, there is a call trace:

  Device '(null)' does not have a release() function, it is broken and must be fixed.
  See Documentation/core-api/kobject.rst.
  WARNING: drivers/base/core.c:2567 at device_release+0x84/0x90, CPU#5: rmmod/127209
  ...
  RIP: 0010:device_release+0x84/0x90
  Call Trace:
   <TASK>
   kobject_put+0x8c/0x220
   put_device+0x17/0x30
   igen6_unregister_mcis+0xa2/0xe0 [igen6_edac]
   igen6_remove+0x82/0xb0 [igen6_edac]
   ...

Fix the call trace by providing empty release() functions for the
memory controller devices.

The Linux kernel CVE team has assigned CVE-2026-80643 to this issue.


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

	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 6.18.40 with commit 9a84ced0243c74aa431ec287555054c69e6167d1
	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 7.1.5 with commit a341302c5126ef96bb45286224d67ef60a24281e
	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 7.2 with commit ab1f9d466c7d83ab0d2a529e07984e53b5960dcd

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-2026-80643
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/9a84ced0243c74aa431ec287555054c69e6167d1
	https://git.kernel.org/stable/c/a341302c5126ef96bb45286224d67ef60a24281e
	https://git.kernel.org/stable/c/ab1f9d466c7d83ab0d2a529e07984e53b5960dcd