linux-cve-announce - CVE-2025-37759: ublk: fix handling recovery & reissue in ublk_abort

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Message-ID: <2025050140-CVE-2025-37759-5f57@gregkh>
Date: Thu,  1 May 2025 14:57:05 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37759: ublk: fix handling recovery & reissue in ublk_abort_queue()

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

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

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

ublk: fix handling recovery & reissue in ublk_abort_queue()

Commit 8284066946e6 ("ublk: grab request reference when the request is handled
by userspace") doesn't grab request reference in case of recovery reissue.
Then the request can be requeued & re-dispatch & failed when canceling
uring command.

If it is one zc request, the request can be freed before io_uring
returns the zc buffer back, then cause kernel panic:

[  126.773061] BUG: kernel NULL pointer dereference, address: 00000000000000c8
[  126.773657] #PF: supervisor read access in kernel mode
[  126.774052] #PF: error_code(0x0000) - not-present page
[  126.774455] PGD 0 P4D 0
[  126.774698] Oops: Oops: 0000 [#1] SMP NOPTI
[  126.775034] CPU: 13 UID: 0 PID: 1612 Comm: kworker/u64:55 Not tainted 6.14.0_blk+ #182 PREEMPT(full)
[  126.775676] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-1.fc39 04/01/2014
[  126.776275] Workqueue: iou_exit io_ring_exit_work
[  126.776651] RIP: 0010:ublk_io_release+0x14/0x130 [ublk_drv]

Fixes it by always grabbing request reference for aborting the request.

The Linux kernel CVE team has assigned CVE-2025-37759 to this issue.


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

	Issue introduced in 6.5 with commit 8284066946e6d9cc979566ce698fe24e7ca0b31e and fixed in 6.12.24 with commit caa5c8a2358604f38bf0a4afaa5eacda13763067
	Issue introduced in 6.5 with commit 8284066946e6d9cc979566ce698fe24e7ca0b31e and fixed in 6.13.12 with commit 5d34a30efac9c9c93e150130caa940c0df6053c1
	Issue introduced in 6.5 with commit 8284066946e6d9cc979566ce698fe24e7ca0b31e and fixed in 6.14.3 with commit 0a21d259ca4d6310fdfcc0284ebbc000e66cbf70
	Issue introduced in 6.5 with commit 8284066946e6d9cc979566ce698fe24e7ca0b31e and fixed in 6.15-rc2 with commit 6ee6bd5d4fce502a5b5a2ea805e9ff16e6aa890f

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-2025-37759
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/caa5c8a2358604f38bf0a4afaa5eacda13763067
	https://git.kernel.org/stable/c/5d34a30efac9c9c93e150130caa940c0df6053c1
	https://git.kernel.org/stable/c/0a21d259ca4d6310fdfcc0284ebbc000e66cbf70
	https://git.kernel.org/stable/c/6ee6bd5d4fce502a5b5a2ea805e9ff16e6aa890f