linux-cve-announce - CVE-2024-53241: x86/xen: don't do PV iret hypercall through hypercall page

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Message-ID: <2024122449-CVE-2024-53241-597b@gregkh>
Date: Tue, 24 Dec 2024 10:24:50 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53241: x86/xen: don't do PV iret hypercall through hypercall page

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

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

x86/xen: don't do PV iret hypercall through hypercall page

Instead of jumping to the Xen hypercall page for doing the iret
hypercall, directly code the required sequence in xen-asm.S.

This is done in preparation of no longer using hypercall page at all,
as it has shown to cause problems with speculation mitigations.

This is part of XSA-466 / CVE-2024-53241.

The Linux kernel CVE team has assigned CVE-2024-53241 to this issue.


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

	Fixed in 5.10.232 with commit 05df6e6cd9a76b778aee33c3c18c9f3b3566d4a5
	Fixed in 5.15.175 with commit c7b4cfa6213a44fa48714186dfdf125072d036e3
	Fixed in 6.1.121 with commit fa719857f613fed94a79da055b13ca51214c694f
	Fixed in 6.6.67 with commit 82c211ead1ec440dbf81727e17b03b5e3c44b93d
	Fixed in 6.12.6 with commit f7c3fdad0a474062d566aae3289d490d7e702d30
	Fixed in 6.13-rc4 with commit a2796dff62d6c6bfc5fbebdf2bee0d5ac0438906

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-2024-53241
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/xen-asm.S


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/05df6e6cd9a76b778aee33c3c18c9f3b3566d4a5
	https://git.kernel.org/stable/c/c7b4cfa6213a44fa48714186dfdf125072d036e3
	https://git.kernel.org/stable/c/fa719857f613fed94a79da055b13ca51214c694f
	https://git.kernel.org/stable/c/82c211ead1ec440dbf81727e17b03b5e3c44b93d
	https://git.kernel.org/stable/c/f7c3fdad0a474062d566aae3289d490d7e702d30
	https://git.kernel.org/stable/c/a2796dff62d6c6bfc5fbebdf2bee0d5ac0438906