---
id: CVE-2025-37759
title: 'ublk: fix handling recovery & reissue in ublk_abort_queue()'
summary: |-
  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 …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e <
    ab41bf5a211fbec3a85e025658ed90a911ccb692
  - >-
    Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e <
    caa5c8a2358604f38bf0a4afaa5eacda13763067
  - >-
    Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e <
    5d34a30efac9c9c93e150130caa940c0df6053c1
  - >-
    Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e <
    0a21d259ca4d6310fdfcc0284ebbc000e66cbf70
  - >-
    Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e <
    6ee6bd5d4fce502a5b5a2ea805e9ff16e6aa890f
  - Linux 6.5
published: '2025-05-01'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:36:27.136Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-37759'
references:
  - url: 'https://git.kernel.org/stable/c/ab41bf5a211fbec3a85e025658ed90a911ccb692'
  - url: 'https://git.kernel.org/stable/c/caa5c8a2358604f38bf0a4afaa5eacda13763067'
  - url: 'https://git.kernel.org/stable/c/5d34a30efac9c9c93e150130caa940c0df6053c1'
  - url: 'https://git.kernel.org/stable/c/0a21d259ca4d6310fdfcc0284ebbc000e66cbf70'
  - url: 'https://git.kernel.org/stable/c/6ee6bd5d4fce502a5b5a2ea805e9ff16e6aa890f'
tags:
  - cve.org
epss: 0.0024
epssPercentile: 0.15006
ingestedAt: '2026-10-21T12:48:53.712Z'
---

## Overview

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.

## Affected

- `Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e < ab41bf5a211fbec3a85e025658ed90a911ccb692`
- `Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e < caa5c8a2358604f38bf0a4afaa5eacda13763067`
- `Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e < 5d34a30efac9c9c93e150130caa940c0df6053c1`
- `Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e < 0a21d259ca4d6310fdfcc0284ebbc000e66cbf70`
- `Linux >= 8284066946e6d9cc979566ce698fe24e7ca0b31e < 6ee6bd5d4fce502a5b5a2ea805e9ff16e6aa890f`
- `Linux 6.5`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.