linux-cve-announce - CVE-2024-56764: ublk: detach gendisk from ublk device if add

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Message-ID: <2025010655-CVE-2024-56764-347d@gregkh>
Date: Mon,  6 Jan 2025 17:20:58 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-56764: ublk: detach gendisk from ublk device if add_disk() fails

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

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

ublk: detach gendisk from ublk device if add_disk() fails

Inside ublk_abort_requests(), gendisk is grabbed for aborting all
inflight requests. And ublk_abort_requests() is called when exiting
the uring context or handling timeout.

If add_disk() fails, the gendisk may have been freed when calling
ublk_abort_requests(), so use-after-free can be caused when getting
disk's reference in ublk_abort_requests().

Fixes the bug by detaching gendisk from ublk device if add_disk() fails.

The Linux kernel CVE team has assigned CVE-2024-56764 to this issue.


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

	Issue introduced in 6.7 with commit bd23f6c2c2d00518e2f27f2d25cef795de9bee56 and fixed in 6.12.8 with commit 7d680f2f76a3417fdfc3946da7471e81464f7b41
	Issue introduced in 6.7 with commit bd23f6c2c2d00518e2f27f2d25cef795de9bee56 and fixed in 6.13-rc5 with commit 75cd4005da5492129917a4a4ee45e81660556104

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-2024-56764
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:
	drivers/block/ublk_drv.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/7d680f2f76a3417fdfc3946da7471e81464f7b41
	https://git.kernel.org/stable/c/75cd4005da5492129917a4a4ee45e81660556104