linux-cve-announce - CVE-2025-68806: ksmbd: fix buffer validation by including null terminator size in EA length

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Message-ID: <2026011310-CVE-2025-68806-a2fb@gregkh>
Date: Tue, 13 Jan 2026 16:29:32 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68806: ksmbd: fix buffer validation by including null terminator size in EA length

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

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

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

ksmbd: fix buffer validation by including null terminator size in EA length

The smb2_set_ea function, which handles Extended Attributes (EA),
was performing buffer validation checks that incorrectly omitted the size
of the null terminating character (+1 byte) for EA Name.
This patch fixes the issue by explicitly adding '+ 1' to EaNameLength where
the null terminator is expected to be present in the buffer, ensuring
the validation accurately reflects the total required buffer size.

The Linux kernel CVE team has assigned CVE-2025-68806 to this issue.


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

	Fixed in 6.1.160 with commit cae52c592a07e1d3fa3338a5f064a374a5f26750
	Fixed in 6.6.120 with commit a28a375a5439eb474e9f284509a407efb479c925
	Fixed in 6.12.64 with commit d26af6d14da43ab92d07bc60437c62901dc522e6
	Fixed in 6.18.3 with commit 6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4
	Fixed in 6.19-rc2 with commit 95d7a890e4b03e198836d49d699408fd1867cb55

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-2025-68806
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/smb2pdu.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/cae52c592a07e1d3fa3338a5f064a374a5f26750
	https://git.kernel.org/stable/c/a28a375a5439eb474e9f284509a407efb479c925
	https://git.kernel.org/stable/c/d26af6d14da43ab92d07bc60437c62901dc522e6
	https://git.kernel.org/stable/c/6dc8cf6e7998ef7aeb9383a4c2904ea5d22fa2e4
	https://git.kernel.org/stable/c/95d7a890e4b03e198836d49d699408fd1867cb55