Linux Kernel up to 5.10.31/5.11/5.11.15 Page Refcount ch_ktls denial of service

Summaryinfo

A vulnerability has been found in Linux Kernel up to 5.10.31/5.11/5.11.15 and classified as problematic. This affects the function ch_ktls of the component Page Refcount Handler. This manipulation causes denial of service. This vulnerability is registered as CVE-2021-46911. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in Linux Kernel up to 5.10.31/5.11/5.11.15 (Operating System). Affected by this vulnerability is the function ch_ktls of the component Page Refcount Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ch_ktls: Fix kernel panic Taking page refcount is not ideal and causes kernel panic sometimes. It's better to take tx_ctx lock for the complete skb transmit, to avoid page cleanup if ACK received in middle.

The weakness was published 02/27/2024. The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2021-46911 since 02/25/2024. Technical details are known, but no exploit is available.

Upgrading to version 5.10.32, 5.11.16 or 5.12 eliminates this vulnerability. Applying the patch 8d5a9dbd2116/8348665d4181/1a73e427b824 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

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.10.0
• 5.10.1
• 5.10.2
• 5.10.3
• 5.10.4
• 5.10.5
• 5.10.6
• 5.10.7
• 5.10.8
• 5.10.9
• 5.10.10
• 5.10.11
• 5.10.12
• 5.10.13
• 5.10.14
• 5.10.15
• 5.10.16
• 5.10.17
• 5.10.18
• 5.10.19
• 5.10.20
• 5.10.21
• 5.10.22
• 5.10.23
• 5.10.24
• 5.10.25
• 5.10.26
• 5.10.27
• 5.10.28
• 5.10.29
• 5.10.30
• 5.10.31
• 5.11
• 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

License

• open-source

Website

• Vendor: https://www.kernel.org/

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