linux-cve-announce - CVE-2025-21964: cifs: Fix integer overflow while processing acregmax mount option

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Message-ID: <2025040145-CVE-2025-21964-e2c1@gregkh>
Date: Tue,  1 Apr 2025 16:45:49 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21964: cifs: Fix integer overflow while processing acregmax mount option

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

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

cifs: Fix integer overflow while processing acregmax mount option

User-provided mount parameter acregmax 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-2025-21964 to this issue.


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

	Issue introduced in 5.12 with commit 5780464614f6abe6026f00cf5a0777aa453ba450 and fixed in 6.1.132 with commit dd190168e60ac15408f074a1fe0ce36aff34027b
	Issue introduced in 5.12 with commit 5780464614f6abe6026f00cf5a0777aa453ba450 and fixed in 6.6.84 with commit 0252c33cc943e9e48ddfafaa6b1eb72adb68a099
	Issue introduced in 5.12 with commit 5780464614f6abe6026f00cf5a0777aa453ba450 and fixed in 6.12.20 with commit 833f2903eb8b70faca7967319e580e9ce69729fc
	Issue introduced in 5.12 with commit 5780464614f6abe6026f00cf5a0777aa453ba450 and fixed in 6.13.8 with commit 5f500874ab9b3cc8c169c2ab49f00b838520b9c5
	Issue introduced in 5.12 with commit 5780464614f6abe6026f00cf5a0777aa453ba450 and fixed in 6.14 with commit 7489161b1852390b4413d57f2457cd40b34da6cc

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-2025-21964
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/dd190168e60ac15408f074a1fe0ce36aff34027b
	https://git.kernel.org/stable/c/0252c33cc943e9e48ddfafaa6b1eb72adb68a099
	https://git.kernel.org/stable/c/833f2903eb8b70faca7967319e580e9ce69729fc
	https://git.kernel.org/stable/c/5f500874ab9b3cc8c169c2ab49f00b838520b9c5
	https://git.kernel.org/stable/c/7489161b1852390b4413d57f2457cd40b34da6cc