linux-cve-announce - CVE-2024-56708: EDAC/igen6: Avoid segmentation fault on module unload

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Message-ID: <2024122838-CVE-2024-56708-2702@gregkh>
Date: Sat, 28 Dec 2024 10:46:00 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56708: EDAC/igen6: Avoid segmentation fault on module unload

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

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

EDAC/igen6: Avoid segmentation fault on module unload

The segmentation fault happens because:

During modprobe:
1. In igen6_probe(), igen6_pvt will be allocated with kzalloc()
2. In igen6_register_mci(), mci->pvt_info will point to
   &igen6_pvt->imc[mc]

During rmmod:
1. In mci_release() in edac_mc.c, it will kfree(mci->pvt_info)
2. In igen6_remove(), it will kfree(igen6_pvt);

Fix this issue by setting mci->pvt_info to NULL to avoid the double
kfree.

The Linux kernel CVE team has assigned CVE-2024-56708 to this issue.


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

	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 5.15.174 with commit 029ac07bb92d2f7502d47a4916f197a8445d83bf
	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 6.1.120 with commit 2a80e710bbc088a2511c159ee4d910456c5f0832
	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 6.6.64 with commit 830cabb61113d92a425dd3038ccedbdfb3c8d079
	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 6.11.11 with commit e5c7052664b61f9e2f896702d20552707d0ef60a
	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 6.12.2 with commit db60326f2c47b079e36785ace621eb3002db2088
	Issue introduced in 5.11 with commit 10590a9d4f23e0a519730d79d39331df60ad2079 and fixed in 6.13-rc1 with commit fefaae90398d38a1100ccd73b46ab55ff4610fba

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-2024-56708
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/029ac07bb92d2f7502d47a4916f197a8445d83bf
	https://git.kernel.org/stable/c/2a80e710bbc088a2511c159ee4d910456c5f0832
	https://git.kernel.org/stable/c/830cabb61113d92a425dd3038ccedbdfb3c8d079
	https://git.kernel.org/stable/c/e5c7052664b61f9e2f896702d20552707d0ef60a
	https://git.kernel.org/stable/c/db60326f2c47b079e36785ace621eb3002db2088
	https://git.kernel.org/stable/c/fefaae90398d38a1100ccd73b46ab55ff4610fba