linux-cve-announce - CVE-2026-23093: ksmbd: smbd: fix dma_unmap

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Message-ID: <2026020426-CVE-2026-23093-db0d@gregkh>
Date: Wed,  4 Feb 2026 17:14:52 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23093: ksmbd: smbd: fix dma_unmap_sg() nents

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

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

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

ksmbd: smbd: fix dma_unmap_sg() nents

The dma_unmap_sg() functions should be called with the same nents as the
dma_map_sg(), not the value the map function returned.

The Linux kernel CVE team has assigned CVE-2026-23093 to this issue.


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

	Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.18.8 with commit d1943bc9dc9508f5933788a76f8a35d10e43a646
	Issue introduced in 5.15 with commit 0626e6641f6b467447c81dd7678a69c66f7746cf and fixed in 6.19-rc7 with commit 98e3e2b561bc88f4dd218d1c05890672874692f6

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-2026-23093
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/transport_rdma.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/d1943bc9dc9508f5933788a76f8a35d10e43a646
	https://git.kernel.org/stable/c/98e3e2b561bc88f4dd218d1c05890672874692f6