linux-cve-announce - CVE-2022-49054: Drivers: hv: vmbus: Deactivate sysctl_record_panic

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Message-ID: <2025022652-CVE-2022-49054-d850@gregkh>
Date: Wed, 26 Feb 2025 02:54:19 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49054: Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests

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

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

Drivers: hv: vmbus: Deactivate sysctl_record_panic_msg by default in isolated guests

hv_panic_page might contain guest-sensitive information, do not dump it
over to Hyper-V by default in isolated guests.

While at it, update some comments in hyperv_{panic,die}_event().

The Linux kernel CVE team has assigned CVE-2022-49054 to this issue.


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

	Fixed in 5.15.35 with commit 1b576e81d31b56b248316b8ff816b1cc5c4407c7
	Fixed in 5.17.4 with commit 6230bc50d6d21cae4c084766623d0a6d17958721
	Fixed in 5.18 with commit 9f8b577f7b43b2170628d6c537252785dcc2dcea

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-2022-49054
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/hv/vmbus_drv.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/1b576e81d31b56b248316b8ff816b1cc5c4407c7
	https://git.kernel.org/stable/c/6230bc50d6d21cae4c084766623d0a6d17958721
	https://git.kernel.org/stable/c/9f8b577f7b43b2170628d6c537252785dcc2dcea