linux-cve-announce - CVE-2024-58095: jfs: add check read-only before txBeginAnon() call

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Message-ID: <2025041653-CVE-2024-58095-9a41@gregkh>
Date: Wed, 16 Apr 2025 16:11:52 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-58095: jfs: add check read-only before txBeginAnon() call

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

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

jfs: add check read-only before txBeginAnon() call

Added a read-only check before calling `txBeginAnon` in `extAlloc`
and `extRecord`. This prevents modification attempts on a read-only
mounted filesystem, avoiding potential errors or crashes.

Call trace:
 txBeginAnon+0xac/0x154
 extAlloc+0xe8/0xdec fs/jfs/jfs_extent.c:78
 jfs_get_block+0x340/0xb98 fs/jfs/inode.c:248
 __block_write_begin_int+0x580/0x166c fs/buffer.c:2128
 __block_write_begin fs/buffer.c:2177 [inline]
 block_write_begin+0x98/0x11c fs/buffer.c:2236
 jfs_write_begin+0x44/0x88 fs/jfs/inode.c:299

The Linux kernel CVE team has assigned CVE-2024-58095 to this issue.


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

	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.14.2 with commit 15469c408af2d7a52fb186a92f2f091b0f13b1fb
	Issue introduced in 2.6.12 with commit 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and fixed in 6.15-rc1 with commit 0176e69743ecc02961f2ae1ea42439cd2bf9ed58

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-2024-58095
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/jfs/jfs_extent.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/15469c408af2d7a52fb186a92f2f091b0f13b1fb
	https://git.kernel.org/stable/c/0176e69743ecc02961f2ae1ea42439cd2bf9ed58