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CVE-2021-31829

Public on 2021-05-06
Modified on 2021-05-24
Description

A flaw was found in the Linux kernel's eBPF verification code. By default, accessing the eBPF verifier is only accessible to privileged users with CAP_SYS_ADMIN. This flaw allows a local user who can insert eBPF instructions, to use the eBPF verifier to abuse a spectre-like flaw and infer all system memory. The highest threat from this vulnerability is to confidentiality.

Severity
Medium
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CVSS v3 Base Score
6.2
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Affected Packages

Platform Package Release Date Advisory
Amazon Linux 1 kernel 2021-05-20 21:12 ALAS-2021-1503
Amazon Linux 2 - Core kernel 2021-05-20 15:51 ALAS2-2021-1636
Amazon Linux 2 - Kernel-5.10 Extra kernel 2022-01-20 23:18 ALAS2KERNEL-5.10-2022-001
Amazon Linux 2 - Kernel-5.4 Extra kernel 2022-01-12 00:00 ALAS2KERNEL-5.4-2022-003

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD CVSSv3 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD CVSSv2 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N