linux-cve-announce - CVE-2024-56564: ceph: pass cred pointer to ceph_mds_auth

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Message-ID: <2024122714-CVE-2024-56564-7587@gregkh>
Date: Fri, 27 Dec 2024 15:23:15 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56564: ceph: pass cred pointer to ceph_mds_auth_match()

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

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

ceph: pass cred pointer to ceph_mds_auth_match()

This eliminates a redundant get_current_cred() call, because
ceph_mds_check_access() has already obtained this pointer.

As a side effect, this also fixes a reference leak in
ceph_mds_auth_match(): by omitting the get_current_cred() call, no
additional cred reference is taken.

The Linux kernel CVE team has assigned CVE-2024-56564 to this issue.


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

	Issue introduced in 6.10 with commit 596afb0b8933ba6ed7227adcc538db26feb25c74 and fixed in 6.12.4 with commit ffa6ba7bdb7f07f49c9e9150b0176df066520f62
	Issue introduced in 6.10 with commit 596afb0b8933ba6ed7227adcc538db26feb25c74 and fixed in 6.13-rc1 with commit 23426309a4064b25a961e1c72961d8bfc7c8c990

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-2024-56564
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/ceph/mds_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/ffa6ba7bdb7f07f49c9e9150b0176df066520f62
	https://git.kernel.org/stable/c/23426309a4064b25a961e1c72961d8bfc7c8c990