linux-cve-announce - CVE-2024-50112: x86/lam: Disable ADDRESS

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Message-ID: <2024110555-CVE-2024-50112-37de@gregkh>
Date: Tue,  5 Nov 2024 18:11:01 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-50112: x86/lam: Disable ADDRESS_MASKING in most cases

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

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

x86/lam: Disable ADDRESS_MASKING in most cases

Linear Address Masking (LAM) has a weakness related to transient
execution as described in the SLAM paper[1]. Unless Linear Address
Space Separation (LASS) is enabled this weakness may be exploitable.

Until kernel adds support for LASS[2], only allow LAM for COMPILE_TEST,
or when speculation mitigations have been disabled at compile time,
otherwise keep LAM disabled.

There are no processors in market that support LAM yet, so currently
nobody is affected by this issue.

[1] SLAM: https://download.vusec.net/papers/slam_sp24.pdf
[2] LASS: https://lore.kernel.org/lkml/20230609183632.48706-1-alexander.shishkin@linux.intel.com/

[ dhansen: update SPECULATION_MITIGATIONS -> CPU_MITIGATIONS ]

The Linux kernel CVE team has assigned CVE-2024-50112 to this issue.


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

	Fixed in 6.6.59 with commit 60a5ba560f29
	Fixed in 6.11.6 with commit 690599066488
	Fixed in 6.12-rc5 with commit 3267cb6d3a17

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-2024-50112
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/Kconfig


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/60a5ba560f296ad8da153f6ad3f70030bfa3958f
	https://git.kernel.org/stable/c/690599066488d16db96ac0d6340f9372fc56f337
	https://git.kernel.org/stable/c/3267cb6d3a174ff83d6287dcd5b0047bbd912452