Linux Kernel up to 5.11.20/5.12.3 ataflop do_format array index

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel up to 5.11.20/5.12.3. Affected by this issue is the function do_format of the component ataflop. Such manipulation leads to array index. This vulnerability is referenced as CVE-2021-47039. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 5.11.20/5.12.3 (Operating System). Affected by this issue is the function do_format of the component ataflop. The manipulation with an unknown input leads to a array index vulnerability. Using CWE to declare the problem leads to CWE-129. The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ataflop: potential out of bounds in do_format() The function uses "type" as an array index: q = unit[drive].disk[type]->queue; Unfortunately the bounds check on "type" isn't done until later in the function. Fix this by moving the bounds check to the start.

The weakness was published 02/28/2024. The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2021-47039 since 02/27/2024. 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 01/09/2025).

Upgrading to version 5.11.21, 5.12.4 or 5.13 eliminates this vulnerability. Applying the patch 07f86aa8f4fe/2a3a8bbca28b/1ffec389a643 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.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.11.0
• 5.11.1
• 5.11.2
• 5.11.3
• 5.11.4
• 5.11.5
• 5.11.6
• 5.11.7
• 5.11.8
• 5.11.9
• 5.11.10
• 5.11.11
• 5.11.12
• 5.11.13
• 5.11.14
• 5.11.15
• 5.11.16
• 5.11.17
• 5.11.18
• 5.11.19
• 5.11.20
• 5.12.0
• 5.12.1
• 5.12.2
• 5.12.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

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