CVE-2021-3444

CVE Details

Release Date:

2021-03-23

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.

See more information about CVE-2021-3444 from MITRE CVE dictionary and NIST NVD

CVSS v3.0 metrics

NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.

Base Score:	7.8	Base Metrics:	AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Access Vector:	Local network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	High
Integrity Impact:	High	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 7 (kernel-uek)	ELSA-2021-9140	2021-03-31
Oracle Linux version 7 (kernel-uek-container)	ELSA-2021-9141	2021-03-31
Oracle Linux version 8 (kernel-uek)	ELSA-2021-9140	2021-03-31
Oracle Linux version 8 (kernel-uek-container)	ELSA-2021-9141	2021-03-31

This page is generated automatically and has not been checked for errors or omissions. For clarification or corrections please contact the Oracle Linux ULN team