linux-cve-announce - CVE-2022-49127: ref_tracker: implement use-after-free detection

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Message-ID: <2025022605-CVE-2022-49127-15e6@gregkh>
Date: Wed, 26 Feb 2025 02:55:32 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49127: ref_tracker: implement use-after-free detection

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

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

ref_tracker: implement use-after-free detection

Whenever ref_tracker_dir_init() is called, mark the struct ref_tracker_dir
as dead.

Test the dead status from ref_tracker_alloc() and ref_tracker_free()

This should detect buggy dev_put()/dev_hold() happening too late
in netdevice dismantle process.

The Linux kernel CVE team has assigned CVE-2022-49127 to this issue.


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

	Fixed in 5.17.3 with commit 3743c9de303fa36c2e2ca2522ab280c52bcafbd2
	Fixed in 5.18 with commit e3ececfe668facd87d920b608349a32607060e66

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-2022-49127
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:
	include/linux/ref_tracker.h
	lib/ref_tracker.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/3743c9de303fa36c2e2ca2522ab280c52bcafbd2
	https://git.kernel.org/stable/c/e3ececfe668facd87d920b608349a32607060e66