linux-cve-announce - CVE-2022-50148: kernfs: fix potential NULL dereference in __kernfs

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: <2025061821-CVE-2022-50148-371d@gregkh>
Date: Wed, 18 Jun 2025 13:03:33 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50148: kernfs: fix potential NULL dereference in __kernfs_remove

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

kernfs: fix potential NULL dereference in __kernfs_remove

When lockdep is enabled, lockdep_assert_held_write would
cause potential NULL pointer dereference.

Fix the following smatch warnings:

fs/kernfs/dir.c:1353 __kernfs_remove() warn: variable dereferenced before check 'kn' (see line 1346)

The Linux kernel CVE team has assigned CVE-2022-50148 to this issue.


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

	Issue introduced in 5.17 with commit 393c3714081a53795bbff0e985d24146def6f57f and fixed in 5.18.18 with commit b871986d9d3071f5082664ac274d93f08db257cd
	Issue introduced in 5.17 with commit 393c3714081a53795bbff0e985d24146def6f57f and fixed in 5.19.2 with commit 4a9f35b8729c5bf13ea671c908c17ed74c48fc50
	Issue introduced in 5.17 with commit 393c3714081a53795bbff0e985d24146def6f57f and fixed in 6.0 with commit 72b5d5aef246a0387cefa23121dd90901c7a691a

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-2022-50148
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/kernfs/dir.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/b871986d9d3071f5082664ac274d93f08db257cd
	https://git.kernel.org/stable/c/4a9f35b8729c5bf13ea671c908c17ed74c48fc50
	https://git.kernel.org/stable/c/72b5d5aef246a0387cefa23121dd90901c7a691a