linux-cve-announce - CVE-2025-21963: cifs: Fix integer overflow while processing acdirmax mount option

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: <2025040145-CVE-2025-21963-6e21@gregkh>
Date: Tue,  1 Apr 2025 16:45:48 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21963: cifs: Fix integer overflow while processing acdirmax mount option

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

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

cifs: Fix integer overflow while processing acdirmax mount option

User-provided mount parameter acdirmax of type u32 is intended to have
an upper limit, but before it is validated, the value is converted from
seconds to jiffies which can lead to an integer overflow.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

The Linux kernel CVE team has assigned CVE-2025-21963 to this issue.


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

	Issue introduced in 5.12 with commit 4c9f948142a550af416a2bfb5e56d29ce29e92cf and fixed in 6.1.132 with commit 39d086bb3558da9640ef335f97453e01d32578a1
	Issue introduced in 5.12 with commit 4c9f948142a550af416a2bfb5e56d29ce29e92cf and fixed in 6.6.84 with commit 9e438d0410a4002d24f420f2c28897ba2dc0af64
	Issue introduced in 5.12 with commit 4c9f948142a550af416a2bfb5e56d29ce29e92cf and fixed in 6.12.20 with commit 2809a79bc64964ce02e0c5f2d6bd39b9d09bdb3c
	Issue introduced in 5.12 with commit 4c9f948142a550af416a2bfb5e56d29ce29e92cf and fixed in 6.13.8 with commit 6124cbf73e3dea7591857dd63b8ccece28952afd
	Issue introduced in 5.12 with commit 4c9f948142a550af416a2bfb5e56d29ce29e92cf and fixed in 6.14 with commit 5b29891f91dfb8758baf1e2217bef4b16b2b165b

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-2025-21963
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/smb/client/fs_context.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/39d086bb3558da9640ef335f97453e01d32578a1
	https://git.kernel.org/stable/c/9e438d0410a4002d24f420f2c28897ba2dc0af64
	https://git.kernel.org/stable/c/2809a79bc64964ce02e0c5f2d6bd39b9d09bdb3c
	https://git.kernel.org/stable/c/6124cbf73e3dea7591857dd63b8ccece28952afd
	https://git.kernel.org/stable/c/5b29891f91dfb8758baf1e2217bef4b16b2b165b