linux-cve-announce - CVE-2025-22068: ublk: make sure ubq->canceling is set when queue is frozen

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Message-ID: <2025041609-CVE-2025-22068-8ffd@gregkh>
Date: Wed, 16 Apr 2025 16:12:39 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22068: ublk: make sure ubq->canceling is set when queue is frozen

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

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

ublk: make sure ubq->canceling is set when queue is frozen

Now ublk driver depends on `ubq->canceling` for deciding if the request
can be dispatched via uring_cmd & io_uring_cmd_complete_in_task().

Once ubq->canceling is set, the uring_cmd can be done via ublk_cancel_cmd()
and io_uring_cmd_done().

So set ubq->canceling when queue is frozen, this way makes sure that the
flag can be observed from ublk_queue_rq() reliably, and avoids
use-after-free on uring_cmd.

The Linux kernel CVE team has assigned CVE-2025-22068 to this issue.


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

	Issue introduced in 6.7 with commit 216c8f5ef0f209a3797292c487bdaa6991ab4b92 and fixed in 6.12.23 with commit 7e3497d7dacb5aee69dd9be842b778083cae0e75
	Issue introduced in 6.7 with commit 216c8f5ef0f209a3797292c487bdaa6991ab4b92 and fixed in 6.13.11 with commit 5491400589e7572c2d2627ed6384302f7672aa1d
	Issue introduced in 6.7 with commit 216c8f5ef0f209a3797292c487bdaa6991ab4b92 and fixed in 6.14.2 with commit 9158359015f0eda00e521e35b7bc7ebce176aebf
	Issue introduced in 6.7 with commit 216c8f5ef0f209a3797292c487bdaa6991ab4b92 and fixed in 6.15-rc1 with commit 8741d0737921ec1c03cf59aebf4d01400c2b461a

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-2025-22068
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/7e3497d7dacb5aee69dd9be842b778083cae0e75
	https://git.kernel.org/stable/c/5491400589e7572c2d2627ed6384302f7672aa1d
	https://git.kernel.org/stable/c/9158359015f0eda00e521e35b7bc7ebce176aebf
	https://git.kernel.org/stable/c/8741d0737921ec1c03cf59aebf4d01400c2b461a