CVE-2021-3444

Updated: 2023-11-04 20:52:00.331412

Description:

The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.


Links NIST CIRCL RHEL Ubuntu

Severity

Severity Score
CVSS Version 2.x MEDIUM 4.6
CVSS Version 3.x HIGH 7.8

Status

OS name Project name Version Score Severity Status Errata Last updated
CentOS 6 ELS kernel 2.6.32 7.8 HIGH Not Vulnerable 2021-12-09 07:57:26
CentOS 7 ELS kernel 3.10.0 7.8 HIGH Needs Triage 2023-09-18 17:05:32
CentOS 8.4 ELS kernel 4.18.0 7.8 HIGH Ignored 2022-02-15 12:04:35
CentOS 8.5 ELS kernel 4.18.0 7.8 HIGH Ignored 2022-02-21 05:39:36
CloudLinux 6 ELS kernel 2.6.32 7.8 HIGH Not Vulnerable 2022-03-30 18:51:02
Oracle Linux 6 ELS kernel 2.6.32 7.8 HIGH Not Vulnerable 2022-03-30 18:51:02
Ubuntu 16.04 ELS linux 4.4.0 7.8 HIGH Not Vulnerable 2022-02-17 08:55:51
Ubuntu 16.04 ELS linux-hwe 4.15.0 7.8 HIGH Already Fixed 2022-09-28 03:36:16
Ubuntu 18.04 ELS linux 4.15.0 7.8 HIGH Not Vulnerable 2023-08-28 21:18:51