🛡️ CVE-2026-22995 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

ublk: fix use-after-free in ublk_partition_scan_work

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

ublk: fix use-after-free in ublk_partition_scan_work

A race condition exists between the async partition scan work and device

teardown that can lead to a use-after-free of ub->ub_disk:

1. ublk_ctrl_start_dev() schedules partition_scan_work after add_disk()

2. ublk_stop_dev() calls ublk_stop_dev_unlocked() which does:

  • del_gendisk(ub->ub_disk)
  • ublk_detach_disk() sets ub->ub_disk = NULL
  • put_disk() which may free the disk

3. The worker ublk_partition_scan_work() then dereferences ub->ub_disk

leading to UAF

Fix this by using ublk_get_disk()/ublk_put_disk() in the worker to hold

a reference to the disk during the partition scan. The spinlock in

ublk_get_disk() synchronizes with ublk_detach_disk() ensuring the worker

either gets a valid reference or sees NULL and exits early.

Also change flush_work() to cancel_work_sync() to avoid running the

partition scan work unnecessarily when the disk is already detached.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-22995 is recorded against 2 packages.

  • kernel (from 6.18.4 up to 6.18.6)
  • linux-kernel

Timeline and source

Published on 23 January 2026 and last revised on 15 July 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-22995 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-01-23
Updated 2026-08-12
Modified 2026-07-15

Affected Packages

Software From version Fixed in
kernel 6.18.4 6.18.6
linux-kernel — —

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