Linux Kernel up to 6.1.23/6.2.10 ublk_validate_params privilege escalation

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.1.23/6.2.10. It has been declared as critical. This issue affects the function ublk_validate_params. The manipulation results in an unknown weakness. This vulnerability is reported as CVE-2023-53269. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Linux Kernel up to 6.1.23/6.2.10. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: block: ublk: make sure that block size is set correctly block size is one very key setting for block layer, and bad block size could panic kernel easily. Make sure that block size is set correctly. Meantime if ublk_validate_params() fails, clear ub->params so that disk is prevented from being added.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2023-53269 since 09/16/2025. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 01/11/2026).

The vulnerability scanner Nessus provides a plugin with the ID 265273 (Linux Distros Unpatched Vulnerability : CVE-2023-53269), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.24 or 6.2.11 eliminates this vulnerability. Applying the patch 231a49460ac0203270da2471928d392e5586370f/9dbe85ac618ef6ae60abe5dd17ae2b29065d9c1e/1d1665279a845d16c93687389e364386e3fe0f38 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265273) and CERT Bund (WID-SEC-2025-2053). Once again VulDB remains the best source for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• IBM QRadar SIEM
• SUSE openSUSE
• Open Source Linux Kernel
• RESF Rocky Linux
• Dell Secure Connect Gateway
• F5 F5OS

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.1.0
• 6.1.1
• 6.1.2
• 6.1.3
• 6.1.4
• 6.1.5
• 6.1.6
• 6.1.7
• 6.1.8
• 6.1.9
• 6.1.10
• 6.1.11
• 6.1.12
• 6.1.13
• 6.1.14
• 6.1.15
• 6.1.16
• 6.1.17
• 6.1.18
• 6.1.19
• 6.1.20
• 6.1.21
• 6.1.22
• 6.1.23
• 6.2.0
• 6.2.1
• 6.2.2
• 6.2.3
• 6.2.4
• 6.2.5
• 6.2.6
• 6.2.7
• 6.2.8
• 6.2.9
• 6.2.10

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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Once again VulDB remains the best source for vulnerability data.

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