linux-cve-announce - CVE-2022-49057: block: null

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Message-ID: <2025022652-CVE-2022-49057-94a2@gregkh>
Date: Wed, 26 Feb 2025 02:54:22 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49057: block: null_blk: end timed out poll request

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

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

block: null_blk: end timed out poll request

When poll request is timed out, it is removed from the poll list,
but not completed, so the request is leaked, and never get chance
to complete.

Fix the issue by ending it in timeout handler.

The Linux kernel CVE team has assigned CVE-2022-49057 to this issue.


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

	Issue introduced in 5.16 with commit 0a593fbbc245a85940ed34caa3aa1e4cb060c54b and fixed in 5.17.4 with commit 407d09a22f3f685fd634aa5d05840c64b23bfebc
	Issue introduced in 5.16 with commit 0a593fbbc245a85940ed34caa3aa1e4cb060c54b and fixed in 5.18 with commit 3e3876d322aef82416ecc496a4d4a587e0fdf7a3

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-2022-49057
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/block/null_blk/main.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/407d09a22f3f685fd634aa5d05840c64b23bfebc
	https://git.kernel.org/stable/c/3e3876d322aef82416ecc496a4d4a587e0fdf7a3