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Vulnerabilities
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CVE-2021-34556

Updated on 02 Aug 2021

Severity

5.5 Medium severity

Details

CVSS score
5.5
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CWE ID
Links
NISTCIRCLRHELUbuntu

Overview

About vulnerability

In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.

Details

Affected product:
AlmaLinux 8 , Amazon Linux 2 , CentOS 6 , CentOS 6 ELS , CentOS 6 plus , CentOS 7 , CentOS 7 ELS , CentOS 7 plus , CentOS 8 , CentOS 8.4 ELS , CentOS 8.5 ELS , CentOS Stream 8 ELS , CloudLinux 6 ELS , CloudLinux 7 ELS , CloudLinux OS 6 , CloudLinux OS 6h , CloudLinux OS 7 , CloudLinux OS 7h , CloudLinux OS 8 , Debian 10 , Debian 10 cloud , Debian 9 , Endurance 7 eig 3.10 , OpenVZ 6 , Oracle Linux 6 ELS , Oracle Linux 7 ELS , Proxmox VE 5 , Proxmox VE 6 , RHEL 6 , RHEL 7 , RHEL 7 ELS , RHEL 8 , Rocky Linux 8 , Scientific 6 , Ubuntu 14.04 , Ubuntu 14.04 ESM , Ubuntu 16.04 , Ubuntu 16.04 ELS , Ubuntu 16.04 ESM , Ubuntu 18.04 , Ubuntu 18.04 ELS , Ubuntu 20.04
Affected packages:
kernel @ - (+69 more)
In the Linux kernel through 5.13.7, an unprivileged BPF program can obtain sensitive information from kernel memory via a Speculative Store Bypass side-channel attack because the protection mechanism neglects the possibility of uninitialized memory locations on the BPF stack.

Fixes