linux-cve-announce - CVE-2022-49064: cachefiles: unmark inode in use in error path

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Message-ID: <2025022654-CVE-2022-49064-3c74@gregkh>
Date: Wed, 26 Feb 2025 02:54:29 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49064: cachefiles: unmark inode in use in error path

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

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

cachefiles: unmark inode in use in error path

Unmark inode in use if error encountered. If the in-use flag leakage
occurs in cachefiles_open_file(), Cachefiles will complain "Inode
already in use" when later another cookie with the same index key is
looked up.

If the in-use flag leakage occurs in cachefiles_create_tmpfile(), though
the "Inode already in use" warning won't be triggered, fix the leakage
anyway.

The Linux kernel CVE team has assigned CVE-2022-49064 to this issue.


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

	Issue introduced in 5.17 with commit 1f08c925e7a38002bde509e66f6f891468848511 and fixed in 5.17.4 with commit b2055abafd3d4ee0376fb3eed5cae866316995a1
	Issue introduced in 5.17 with commit 1f08c925e7a38002bde509e66f6f891468848511 and fixed in 5.18 with commit ea5dc046127e857a7873ae55fd57c866e9e86fb2

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-2022-49064
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/cachefiles/namei.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/b2055abafd3d4ee0376fb3eed5cae866316995a1
	https://git.kernel.org/stable/c/ea5dc046127e857a7873ae55fd57c866e9e86fb2