Summaryinfo

A vulnerability was found in Linux Kernel up to 5.12.17/5.13.2 and classified as problematic. Affected by this issue is some unknown functionality of the component v4l2-core. The manipulation leads to initialization. This vulnerability is handled as CVE-2021-47339. There is no exploit available. It is recommended to upgrade the affected component. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 5.12.17/5.13.2 and classified as problematic. Affected by this vulnerability is an unknown code of the component v4l2-core. The manipulation with an unknown input leads to a initialization vulnerability. The CWE definition for the vulnerability is CWE-665. The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: media: v4l2-core: explicitly clear ioctl input data As seen from a recent syzbot bug report, mistakes in the compat ioctl implementation can lead to uninitialized kernel stack data getting used as input for driver ioctl handlers. The reported bug is now fixed, but it's possible that other related bugs are still present or get added in the future. As the drivers need to check user input already, the possible impact is fairly low, but it might still cause an information leak. To be on the safe side, always clear the entire ioctl buffer before calling the conversion handler functions that are meant to initialize them.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2021-47339 since 05/21/2024. The exploitation appears to be easy. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 5.12.18 or 5.13.3 eliminates this vulnerability. Applying the patch dc02c0b2bd60/bfb48b54db25/7b53cca764f9 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.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.12.0
• 5.12.1
• 5.12.2
• 5.12.3
• 5.12.4
• 5.12.5
• 5.12.6
• 5.12.7
• 5.12.8
• 5.12.9
• 5.12.10
• 5.12.11
• 5.12.12
• 5.12.13
• 5.12.14
• 5.12.15
• 5.12.16
• 5.12.17
• 5.13.0
• 5.13.1
• 5.13.2

License

• open-source

CPE 2.3info

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CPE 2.2info

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