linux-cve-announce - CVE-2024-56721: x86/CPU/AMD: Terminate the erratum_1386

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Message-ID: <2024122922-CVE-2024-56721-aaac@gregkh>
Date: Sun, 29 Dec 2024 12:29:22 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56721: x86/CPU/AMD: Terminate the erratum_1386_microcode array

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

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

x86/CPU/AMD: Terminate the erratum_1386_microcode array

The erratum_1386_microcode array requires an empty entry at the end.
Otherwise x86_match_cpu_with_stepping() will continue iterate the array after
it ended.

Add an empty entry to erratum_1386_microcode to its end.

The Linux kernel CVE team has assigned CVE-2024-56721 to this issue.


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

	Issue introduced in 6.10 with commit 29ba89f1895285f06c333546882e0c5ae9a6df23 and fixed in 6.11.11 with commit 82d6b82cf89d950982ac240ba068c3a7e1f23b0a
	Issue introduced in 6.10 with commit 29ba89f1895285f06c333546882e0c5ae9a6df23 and fixed in 6.12.2 with commit ccfee14f08b8699132b87bc6d78e0fa75bf094dd
	Issue introduced in 6.10 with commit 29ba89f1895285f06c333546882e0c5ae9a6df23 and fixed in 6.13-rc1 with commit ff6cdc407f4179748f4673c39b0921503199a0ad

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-2024-56721
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:
	arch/x86/kernel/cpu/amd.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/82d6b82cf89d950982ac240ba068c3a7e1f23b0a
	https://git.kernel.org/stable/c/ccfee14f08b8699132b87bc6d78e0fa75bf094dd
	https://git.kernel.org/stable/c/ff6cdc407f4179748f4673c39b0921503199a0ad