linux-cve-announce - CVE-2025-40099: cifs: parse_dfs_referrals: prevent oob on malformed input

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Message-ID: <2025103017-CVE-2025-40099-fdf0@gregkh>
Date: Thu, 30 Oct 2025 10:48:26 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40099: cifs: parse_dfs_referrals: prevent oob on malformed input

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

cifs: parse_dfs_referrals: prevent oob on malformed input

Malicious SMB server can send invalid reply to FSCTL_DFS_GET_REFERRALS

- reply smaller than sizeof(struct get_dfs_referral_rsp)
- reply with number of referrals smaller than NumberOfReferrals in the
header

Processing of such replies will cause oob.

Return -EINVAL error on such replies to prevent oob-s.

The Linux kernel CVE team has assigned CVE-2025-40099 to this issue.


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

	Fixed in 6.1.158 with commit cfacc7441f760e4a73cc71b6ff1635261d534657
	Fixed in 6.6.114 with commit 15c73964da9df994302f579ed14ee5fdbce7a332
	Fixed in 6.12.55 with commit 8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058
	Fixed in 6.17.5 with commit bb0f2e66e1ac043a5b238f5bcab4f26f3c317039
	Fixed in 6.18-rc2 with commit 6447b0e355562a1ff748c4a2ffb89aae7e84d2c9

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-2025-40099
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/misc.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/cfacc7441f760e4a73cc71b6ff1635261d534657
	https://git.kernel.org/stable/c/15c73964da9df994302f579ed14ee5fdbce7a332
	https://git.kernel.org/stable/c/8bc4a8d39bac23d8b044fd3e2dbfd965f1d9b058
	https://git.kernel.org/stable/c/bb0f2e66e1ac043a5b238f5bcab4f26f3c317039
	https://git.kernel.org/stable/c/6447b0e355562a1ff748c4a2ffb89aae7e84d2c9