Rapid7 Vulnerability & Exploit Database

Alma Linux: CVE-2021-29155: Moderate: kernel security, bug fix, and enhancement update (ALSA-2021-4356)

Back to Search

Alma Linux: CVE-2021-29155: Moderate: kernel security, bug fix, and enhancement update (ALSA-2021-4356)

Severity
2
CVSS
(AV:L/AC:L/Au:N/C:P/I:N/A:N)
Published
04/20/2021
Created
05/05/2022
Added
05/04/2022
Modified
05/13/2022

Description

An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations.

Solution(s)

  • alma-upgrade-kernel-tools-libs-devel

With Rapid7 live dashboards, I have a clear view of all the assets on my network, which ones can be exploited, and what I need to do in order to reduce the risk in my environment in real-time. No other tool gives us that kind of value and insight.

– Scott Cheney, Manager of Information Security, Sierra View Medical Center

;