linux-cve-announce - CVE-2025-68243: NFS: Check the TLS certificate fields in nfs_match

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Message-ID: <2025121633-CVE-2025-68243-cdd0@gregkh>
Date: Tue, 16 Dec 2025 15:21:35 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68243: NFS: Check the TLS certificate fields in nfs_match_client()

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

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

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

NFS: Check the TLS certificate fields in nfs_match_client()

If the TLS security policy is of type RPC_XPRTSEC_TLS_X509, then the
cert_serial and privkey_serial fields need to match as well since they
define the client's identity, as presented to the server.

The Linux kernel CVE team has assigned CVE-2025-68243 to this issue.


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

	Issue introduced in 6.17 with commit 90c9550a8d65fb9b1bf87baf97a04ed91bf61b33 and fixed in 6.17.9 with commit b8fa37219074811c04d4ecb742c73e2b296da6a8
	Issue introduced in 6.17 with commit 90c9550a8d65fb9b1bf87baf97a04ed91bf61b33 and fixed in 6.18 with commit fb2cba0854a7f315c8100a807a6959b99d72479e

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-2025-68243
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/nfs/client.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/b8fa37219074811c04d4ecb742c73e2b296da6a8
	https://git.kernel.org/stable/c/fb2cba0854a7f315c8100a807a6959b99d72479e