Linux Kernel up to 5.15.11 xsk xsk_buff_free buffer overflow

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.15.11 and classified as critical. This affects the function xsk_buff_free of the component xsk. Such manipulation leads to buffer overflow. This vulnerability is documented as CVE-2021-47105. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.15.11 (Operating System) and classified as critical. Affected by this issue is the function xsk_buff_free of the component xsk. 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: ice: xsk: return xsk buffers back to pool when cleaning the ring Currently we only NULL the xdp_buff pointer in the internal SW ring but we never give it back to the xsk buffer pool. This means that buffers can be leaked out of the buff pool and never be used again. Add missing xsk_buff_free() call to the routine that is supposed to clean the entries that are left in the ring so that these buffers in the umem can be used by other sockets. Also, only go through the space that is actually left to be cleaned instead of a whole ring.

The weakness was released 03/04/2024. The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2021-47105. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 02/14/2025).

Upgrading to version 5.15.12 or 5.16 eliminates this vulnerability. Applying the patch ad6d20da2cfb/afe8a3ba85ec 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

• 5.15.0
• 5.15.1
• 5.15.2
• 5.15.3
• 5.15.4
• 5.15.5
• 5.15.6
• 5.15.7
• 5.15.8
• 5.15.9
• 5.15.10
• 5.15.11

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

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