linux-cve-announce - CVE-2022-50839: jbd2: fix potential buffer head reference count leak

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Message-ID: <2025123019-CVE-2022-50839-eca8@gregkh>
Date: Tue, 30 Dec 2025 13:13:25 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50839: jbd2: fix potential buffer head reference count leak

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

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

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

jbd2: fix potential buffer head reference count leak

As in 'jbd2_fc_wait_bufs' if buffer isn't uptodate, will return -EIO without
update 'journal->j_fc_off'. But 'jbd2_fc_release_bufs' will release buffer head
from ‘j_fc_off - 1’ if 'bh' is NULL will terminal release which will lead to
buffer head buffer head reference count leak.
To solve above issue, update 'journal->j_fc_off' before return -EIO.

The Linux kernel CVE team has assigned CVE-2022-50839 to this issue.


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

	Fixed in 5.10.150 with commit 7a33dde572fceb45d02d188e0213c47059401c93
	Fixed in 5.15.75 with commit e7385c868ee038d6a0cb0e85c22d2741e7910fd5
	Fixed in 5.19.17 with commit 68ed9c76b2affd47177b92495446abb7262d0ef7
	Fixed in 6.0.3 with commit 9b073d73725366d886b711b74e058c02f51e7a0e
	Fixed in 6.1 with commit e0d5fc7a6d80ac2406c7dfc6bb625201d0250a8a

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-2022-50839
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/jbd2/journal.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/7a33dde572fceb45d02d188e0213c47059401c93
	https://git.kernel.org/stable/c/e7385c868ee038d6a0cb0e85c22d2741e7910fd5
	https://git.kernel.org/stable/c/68ed9c76b2affd47177b92495446abb7262d0ef7
	https://git.kernel.org/stable/c/9b073d73725366d886b711b74e058c02f51e7a0e
	https://git.kernel.org/stable/c/e0d5fc7a6d80ac2406c7dfc6bb625201d0250a8a