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Linux Kernel CVE-2026-22995

HIGH
Use After Free (CWE-416)
2026-01-23 416baaa9-dc9f-4396-8d5f-8c081fb06d67
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
HIGH
qualitative
Red Hat
MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
Patch released
Feb 26, 2026 - 17:13 nvd
Patch available
CVE Published
Jan 23, 2026 - 16:15 nvd
HIGH 7.8

DescriptionCVE.org

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
  1. 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.

AnalysisAI

Linux kernel ublk subsystem suffers from a use-after-free vulnerability in partition scan operations where a race condition between device teardown and asynchronous partition scanning allows local attackers with user privileges to access freed memory, potentially causing denial of service or information disclosure. The vulnerability stems from improper reference counting of disk objects during concurrent operations, affecting all Linux systems with the vulnerable ublk driver. A patch is available to resolve this issue by implementing proper disk reference management in the partition scan worker.

Technical ContextAI

Classified as CWE-416 (Use After Free). Affects Linux Kernel. 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 t

RemediationAI

A vendor patch is available — apply it immediately.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed

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CVE-2026-22995 vulnerability details – vuln.today

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