linux-cve-announce - CVE-2023-53130: block: fix wrong mode for blkdev_put() from disk_scan

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Message-ID: <2025050234-CVE-2023-53130-015e@gregkh>
Date: Fri,  2 May 2025 17:56:35 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53130: block: fix wrong mode for blkdev_put() from disk_scan_partitions()

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

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

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

block: fix wrong mode for blkdev_put() from disk_scan_partitions()

If disk_scan_partitions() is called with 'FMODE_EXCL',
blkdev_get_by_dev() will be called without 'FMODE_EXCL', however, follow
blkdev_put() is still called with 'FMODE_EXCL', which will cause
'bd_holders' counter to leak.

Fix the problem by using the right mode for blkdev_put().

The Linux kernel CVE team has assigned CVE-2023-53130 to this issue.


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

	Issue fixed in mainline with commit 428913b

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-2023-53130
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:
	block/genhd.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/e5febcfbae9396fb3f064a2a14368c3d77d73ad4
	https://git.kernel.org/stable/c/d81c6c98d45311a7f3abff4bd5e1eb8e5089972e
	https://git.kernel.org/stable/c/428913bce1e67ccb4dae317fd0332545bf8c9233