Linux Kernel up to 5.10.31/5.11/5.11.15 BPF bypass_spec_v1 privilege escalation

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 5.10.31/5.11/5.11.15. The affected element is the function bypass_spec_v1 of the component BPF. The manipulation leads to an unknown weakness. This vulnerability is listed as CVE-2021-46908. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.10.31/5.11/5.11.15 (Operating System). It has been rated as critical. This issue affects the function bypass_spec_v1 of the component BPF. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: bpf: Use correct permission flag for mixed signed bounds arithmetic We forbid adding unknown scalars with mixed signed bounds due to the spectre v1 masking mitigation. Hence this also needs bypass_spec_v1 flag instead of allow_ptr_leaks.

The weakness was presented 02/27/2024. It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2021-46908 since 02/25/2024. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 5.10.32, 5.11.16 or 5.12 eliminates this vulnerability. Applying the patch 4f3ff11204ea/4ccdc6c6cae3/960114839252 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/

CPE 2.3info

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