CVE-2020-27777: A flaw was found in the way RTAS handled 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 local user could use this flaw to further increase their privileges to that of a running kernel.
Overview
- Severity
- Medium (CVSS 6.7)
- CVSS Vector
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2020-Dec
- Released
- 2020-12-22
- EPSS Score
- 0.50% (percentile: 39.4%)
Affected Products (1)
Mariner
- cm1 kernel 5.4.91-1 on CBL Mariner 1.0
Revision History
- 2020-12-22: Information published.