CVE-2025-38302

Local denial of service via duplicate freeze protection

Published Jul 10, 2025 · Updated May 11, 2026

Improper locking in the Linux kernel block layer allows local users to hang block I/O by freezing a queue with pending zoned writes. The blk_zone_wplug_bio_work function resubmits prepared bios through submit_bio_noacct_nocheck, duplicating freeze protection already applied in submit_bio. The issue requires pending bios in a zone write plug when the queue is frozen, and the resulting deadlock interrupts block-device service.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in the Linux kernel block layer allows local users to hang block I/O by freezing a queue with pending zoned writes. The blk_zone_wplug_bio_work function resubmits prepared bios through submit_bio_noacct_nocheck, duplicating freeze protection already applied in submit_bio. The issue requires pending bios in a zone write plug when the queue is frozen, and the resulting deadlock interrupts block-device service.

The record

CVE
CVE-2025-38302
Published
Jul 10, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 10, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.10
  2. Affected versionversion=9b1ce7f0c6f82e241196febabddba5fab66c8f05 <0fccb6773b1f4f992e435582cf8e050de421b678
  3. Affected versionversion=9b1ce7f0c6f82e241196febabddba5fab66c8f05 <6ffae5d53f704d300cc73b06b4ea99e4507f7cf1
  4. Affected versionversion=9b1ce7f0c6f82e241196febabddba5fab66c8f05 <cf625013d8741c01407bbb4a60c111b61b9fa69d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.10; version=9b1ce7f0c6f82e241196febabddba5fab66c8f05 <0fccb6773b1f4f992e435582cf8e050de421b678; version=9b1ce7f0c6f82e241196febabddba5fab66c8f05 <6ffae5d53f704d300cc73b06b4ea99e4507f7cf1; version=9b1ce7f0c6f82e241196febabddba5fab66c8f05 <cf625013d8741c01407bbb4a60c111b61b9fa69d

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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