linux-cve-announce - CVE-2022-49097: NFS: Avoid writeback threads getting stuck in mempool

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Message-ID: <2025022659-CVE-2022-49097-fb5e@gregkh>
Date: Wed, 26 Feb 2025 02:55:02 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49097: NFS: Avoid writeback threads getting stuck in mempool_alloc()

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

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

NFS: Avoid writeback threads getting stuck in mempool_alloc()

In a low memory situation, allow the NFS writeback code to fail without
getting stuck in infinite loops in mempool_alloc().

The Linux kernel CVE team has assigned CVE-2022-49097 to this issue.


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

	Fixed in 5.10.111 with commit c74e2f6ecc51bd08bb5b0335477dba954a50592e
	Fixed in 5.15.34 with commit ea029e4ce760f786919d06ef52efa2e50ea92a5f
	Fixed in 5.16.20 with commit 1b3fa9a3c420c31e77b406ddc28f3a627100516c
	Fixed in 5.17.3 with commit a6caeddd68977a1aaaf62fbd1955b41dd5c3c5d3
	Fixed in 5.18 with commit 0bae835b63c53f86cdc524f5962e39409585b22c

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-2022-49097
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:
	fs/nfs/pagelist.c
	fs/nfs/write.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/c74e2f6ecc51bd08bb5b0335477dba954a50592e
	https://git.kernel.org/stable/c/ea029e4ce760f786919d06ef52efa2e50ea92a5f
	https://git.kernel.org/stable/c/1b3fa9a3c420c31e77b406ddc28f3a627100516c
	https://git.kernel.org/stable/c/a6caeddd68977a1aaaf62fbd1955b41dd5c3c5d3
	https://git.kernel.org/stable/c/0bae835b63c53f86cdc524f5962e39409585b22c