linux-cve-announce - CVE-2022-50495: x86/xen: Fix memory leak in xen_smp_intr_init{

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Message-ID: <2025100419-CVE-2022-50495-fdee@gregkh>
Date: Sat,  4 Oct 2025 17:51:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50495: x86/xen: Fix memory leak in xen_smp_intr_init{_pv}()

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

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

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

x86/xen: Fix memory leak in xen_smp_intr_init{_pv}()

These local variables @{resched|pmu|callfunc...}_name saves the new
string allocated by kasprintf(), and when bind_{v}ipi_to_irqhandler()
fails, it goes to the @fail tag, and calls xen_smp_intr_free{_pv}() to
free resource, however the new string is not saved, which cause a memory
leak issue. fix it.

The Linux kernel CVE team has assigned CVE-2022-50495 to this issue.


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

	Issue introduced in 2.6.24 with commit 9702785a747aa27baf46ff504beab6528f21f2dd and fixed in 4.19.270 with commit 9209d2cbf5845b8bf8e722015d86f65a9d2bc76a
	Issue introduced in 2.6.24 with commit 9702785a747aa27baf46ff504beab6528f21f2dd and fixed in 5.4.229 with commit ec88254208dd01fa1646e939047d382b216340ac
	Issue introduced in 2.6.24 with commit 9702785a747aa27baf46ff504beab6528f21f2dd and fixed in 5.10.163 with commit fc134c355b5299495b14a54dd9bb7af8a646cb7c
	Issue introduced in 2.6.24 with commit 9702785a747aa27baf46ff504beab6528f21f2dd and fixed in 5.15.86 with commit 23aef94eea714b721546c0c49a324a8da8d00fb5
	Issue introduced in 2.6.24 with commit 9702785a747aa27baf46ff504beab6528f21f2dd and fixed in 6.0.16 with commit 8b6d78bb4ece809c425f96a47ca9b69385ba94bb
	Issue introduced in 2.6.24 with commit 9702785a747aa27baf46ff504beab6528f21f2dd and fixed in 6.1.2 with commit f698f88f042c6a19bbbac6c84782039a75e7f349
	Issue introduced in 2.6.24 with commit 9702785a747aa27baf46ff504beab6528f21f2dd and fixed in 6.2 with commit 69143f60868b3939ddc89289b29db593b647295e

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-2022-50495
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/xen/smp.c
	arch/x86/xen/smp_pv.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/9209d2cbf5845b8bf8e722015d86f65a9d2bc76a
	https://git.kernel.org/stable/c/ec88254208dd01fa1646e939047d382b216340ac
	https://git.kernel.org/stable/c/fc134c355b5299495b14a54dd9bb7af8a646cb7c
	https://git.kernel.org/stable/c/23aef94eea714b721546c0c49a324a8da8d00fb5
	https://git.kernel.org/stable/c/8b6d78bb4ece809c425f96a47ca9b69385ba94bb
	https://git.kernel.org/stable/c/f698f88f042c6a19bbbac6c84782039a75e7f349
	https://git.kernel.org/stable/c/69143f60868b3939ddc89289b29db593b647295e