#VU56242 Missing Authorization in Linux kernel - CVE-2020-27777

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Main Vulnerability Database Vulnerabilities #VU56242

#VU56242 Missing Authorization in Linux kernel - CVE-2020-27777

Published: September 1, 2021


Vulnerability identifier: #VU56242
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2020-27777
CWE-ID: CWE-862
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
Linux kernel
Software vendor:
Linux Foundation

Description

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 updates from vendor's website.

External links