SB2020121569 - Privilege escalation in Linux kernel
Published: December 15, 2020 Updated: September 1, 2021
Security Bulletin ID
SB2020121569
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Missing Authorization (CVE-ID: CVE-2020-27777)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to the way RTAS handles memory accesses in userspace to kernel communication. On a locked down (usually due to Secure Boot) guest system running on top of PowerVM or KVM hypervisors (pseries platform) a root like user could use this flaw to further increase their privileges to that of a running kernel.
Remediation
Install update from vendor's website.