CVE-2023-53269

Kernel panic via unchecked ublk block size

Published Sep 16, 2025 · Updated Sep 16, 2025

Improper parameter validation in the Linux kernel ublk driver from 6.0 allows local users to panic the kernel via a malformed block size. ublk_validate_params() accepted a logical block-size shift above PAGE_SHIFT, while failed validation left ub->params populated so an invalid disk could still be added. Reaching the flaw requires local access to the ublk control interface; exploitation crashes the host without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper parameter validation in the Linux kernel ublk driver from 6.0 allows local users to panic the kernel via a malformed block size. ublk_validate_params() accepted a logical block-size shift above PAGE_SHIFT, while failed validation left ub->params populated so an invalid disk could still be added. Reaching the flaw requires local access to the ublk control interface; exploitation crashes the host without reported data disclosure or modification.

The record

CVE
CVE-2023-53269
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record 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=6.0
  2. Affected versionversion=71f28f3136aff5890cd56de78abc673f8393cad9 <1d1665279a845d16c93687389e364386e3fe0f38
  3. Affected versionversion=71f28f3136aff5890cd56de78abc673f8393cad9 <231a49460ac0203270da2471928d392e5586370f
  4. Affected versionversion=71f28f3136aff5890cd56de78abc673f8393cad9 <9dbe85ac618ef6ae60abe5dd17ae2b29065d9c1e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=71f28f3136aff5890cd56de78abc673f8393cad9 <1d1665279a845d16c93687389e364386e3fe0f38; version=71f28f3136aff5890cd56de78abc673f8393cad9 <231a49460ac0203270da2471928d392e5586370f; version=71f28f3136aff5890cd56de78abc673f8393cad9 <9dbe85ac618ef6ae60abe5dd17ae2b29065d9c1e

Published CVSS scores

5.5CISA-ADPCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

T1499.004Application or System Exploitation

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo