Linux Kernel up to 6.11.8 ufence access_ok buffer overflow

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.11.8 and classified as critical. This affects the function access_ok of the component ufence. Such manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2024-53098. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.11.8 and classified as critical. Affected by this issue is the function access_ok of the component ufence. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: drm/xe/ufence: Prefetch ufence addr to catch bogus address access_ok() only checks for addr overflow so also try to read the addr to catch invalid addr sent from userspace. (cherry picked from commit 9408c4508483ffc60811e910a93d6425b8e63928)

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2024-53098 since 11/19/2024. The exploitation is known to be easy. 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 02/20/2025).

The vulnerability scanner Nessus provides a plugin with the ID 216493 (Ubuntu 24.10 : Linux kernel vulnerabilities (USN-7276-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.11.9 eliminates this vulnerability. Applying the patch 5d623ffbae96/9c1813b32534 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 vulnerability database at Tenable (216493). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.11.0
• 6.11.1
• 6.11.2
• 6.11.3
• 6.11.4
• 6.11.5
• 6.11.6
• 6.11.7
• 6.11.8

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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