linux-cve-announce - CVE-2024-42295: nilfs2: handle inconsistent state in nilfs_btnode_create

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: <2024081747-CVE-2024-42295-4f43@gregkh>
Date: Sat, 17 Aug 2024 11:10:00 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-42295: nilfs2: handle inconsistent state in nilfs_btnode_create_block()

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

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

nilfs2: handle inconsistent state in nilfs_btnode_create_block()

Syzbot reported that a buffer state inconsistency was detected in
nilfs_btnode_create_block(), triggering a kernel bug.

It is not appropriate to treat this inconsistency as a bug; it can occur
if the argument block address (the buffer index of the newly created
block) is a virtual block number and has been reallocated due to
corruption of the bitmap used to manage its allocation state.

So, modify nilfs_btnode_create_block() and its callers to treat it as a
possible filesystem error, rather than triggering a kernel bug.

The Linux kernel CVE team has assigned CVE-2024-42295 to this issue.


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

	Issue introduced in 2.6.30 with commit a60be987d45d and fixed in 6.1.103 with commit 012be828a118
	Issue introduced in 2.6.30 with commit a60be987d45d and fixed in 6.6.44 with commit be56dfc9be06
	Issue introduced in 2.6.30 with commit a60be987d45d and fixed in 6.10.3 with commit 366c3f688dd0
	Issue introduced in 2.6.30 with commit a60be987d45d and fixed in 6.11-rc1 with commit 4811f7af6090

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-2024-42295
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/nilfs2/btnode.c
	fs/nilfs2/btree.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/012be828a118bf496e666ef1fc47fc0e7358ada2
	https://git.kernel.org/stable/c/be56dfc9be0604291267c07b0e27a69a6bda4899
	https://git.kernel.org/stable/c/366c3f688dd0288cbe38af1d3a886b5c62372e4a
	https://git.kernel.org/stable/c/4811f7af6090e8f5a398fbdd766f903ef6c0d787