linux-cve-announce - CVE-2025-21946: ksmbd: fix out-of-bounds in parse_sec

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Message-ID: <2025040136-CVE-2025-21946-63a2@gregkh>
Date: Tue,  1 Apr 2025 16:40:10 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21946: ksmbd: fix out-of-bounds in parse_sec_desc()

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

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

ksmbd: fix out-of-bounds in parse_sec_desc()

If osidoffset, gsidoffset and dacloffset could be greater than smb_ntsd
struct size. If it is smaller, It could cause slab-out-of-bounds.
And when validating sid, It need to check it included subauth array size.

The Linux kernel CVE team has assigned CVE-2025-21946 to this issue.


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

	Fixed in 6.6.83 with commit c1569dbbe2d43041be9f3fef7ca08bec3b66ad1b
	Fixed in 6.12.19 with commit 159d059cbcb0e6d0e7a7b34af3862ba09a6b22d1
	Fixed in 6.13.7 with commit 6a9831180d0b23b5c97e2bd841aefc8f82900172
	Fixed in 6.14 with commit d6e13e19063db24f94b690159d0633aaf72a0f03

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-2025-21946
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/server/smbacl.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/c1569dbbe2d43041be9f3fef7ca08bec3b66ad1b
	https://git.kernel.org/stable/c/159d059cbcb0e6d0e7a7b34af3862ba09a6b22d1
	https://git.kernel.org/stable/c/6a9831180d0b23b5c97e2bd841aefc8f82900172
	https://git.kernel.org/stable/c/d6e13e19063db24f94b690159d0633aaf72a0f03