linux-cve-announce - CVE-2024-53147: exfat: fix out-of-bounds access of directory entries

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Message-ID: <2024122426-CVE-2024-53147-bea5@gregkh>
Date: Tue, 24 Dec 2024 12:29:27 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53147: exfat: fix out-of-bounds access of directory entries

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

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

exfat: fix out-of-bounds access of directory entries

In the case of the directory size is greater than or equal to
the cluster size, if start_clu becomes an EOF cluster(an invalid
cluster) due to file system corruption, then the directory entry
where ei->hint_femp.eidx hint is outside the directory, resulting
in an out-of-bounds access, which may cause further file system
corruption.

This commit adds a check for start_clu, if it is an invalid cluster,
the file or directory will be treated as empty.

The Linux kernel CVE team has assigned CVE-2024-53147 to this issue.


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

	Fixed in 6.11.11 with commit a0120d6463368378539ef928cf067d02372efb8c
	Fixed in 6.12.2 with commit 3ddd1cb2b458ff6a193bc845f408dfff217db29e
	Fixed in 6.13-rc1 with commit 184fa506e392eb78364d9283c961217ff2c0617b

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-2024-53147
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/exfat/namei.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/a0120d6463368378539ef928cf067d02372efb8c
	https://git.kernel.org/stable/c/3ddd1cb2b458ff6a193bc845f408dfff217db29e
	https://git.kernel.org/stable/c/184fa506e392eb78364d9283c961217ff2c0617b