lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <2024022711-CVE-2021-46920-062e@gregkh>
Date: Tue, 27 Feb 2024 07:54:12 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2021-46920: dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback

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

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

dmaengine: idxd: Fix clobbering of SWERR overflow bit on writeback

Current code blindly writes over the SWERR and the OVERFLOW bits. Write
back the bits actually read instead so the driver avoids clobbering the
OVERFLOW bit that comes after the register is read.

The Linux kernel CVE team has assigned CVE-2021-46920 to this issue.


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

	Issue introduced in 5.6 with commit bfe1d56091c1 and fixed in 5.10.32 with commit a5ad12d5d69c
	Issue introduced in 5.6 with commit bfe1d56091c1 and fixed in 5.11.16 with commit 02981a44a0e4
	Issue introduced in 5.6 with commit bfe1d56091c1 and fixed in 5.12 with commit ea941ac294d7

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-2021-46920
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/dma/idxd/irq.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/a5ad12d5d69c63af289a37f05187a0c6fe93553d
	https://git.kernel.org/stable/c/02981a44a0e402089775416371bd2e0c935685f8
	https://git.kernel.org/stable/c/ea941ac294d75d0ace50797aebf0056f6f8f7a7f

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ