linux-cve-announce - CVE-2023-52450: perf/x86/intel/uncore: Fix NULL pointer dereference issue in upi_fill

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Message-ID: <2024022256-CVE-2023-52450-48ba@gregkh>
Date: Thu, 22 Feb 2024 17:21:57 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52450: perf/x86/intel/uncore: Fix NULL pointer dereference issue in upi_fill_topology()

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

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

perf/x86/intel/uncore: Fix NULL pointer dereference issue in upi_fill_topology()

Get logical socket id instead of physical id in discover_upi_topology()
to avoid out-of-bound access on 'upi = &type->topology[nid][idx];' line
that leads to NULL pointer dereference in upi_fill_topology()

The Linux kernel CVE team has assigned CVE-2023-52450 to this issue.


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

	Issue introduced in 6.2 with commit f680b6e6062e and fixed in 6.6.14 with commit bf1bf09e6b59
	Issue introduced in 6.2 with commit f680b6e6062e and fixed in 6.7.2 with commit 3d6f4a78b104
	Issue introduced in 6.2 with commit f680b6e6062e and fixed in 6.8-rc1 with commit 1692cf434ba1

Please see https://www.kernel.org or 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-2023-52450
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/events/intel/uncore_snbep.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/bf1bf09e6b599758851457f3999779622a48d015
	https://git.kernel.org/stable/c/3d6f4a78b104c65e4256c3776c9949f49a1b459e
	https://git.kernel.org/stable/c/1692cf434ba13ee212495b5af795b6a07e986ce4