CVE-2020-27777

State: Published
Severity: Not scored
Published: Dec 15, 2020
Updated: Aug 4, 2024
Reserved: Oct 27, 2020

Description

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.

Scores

The record has no CVSS score.

Weaknesses

CWE-862

Affected Products

Product	Versions
kerneln/a	kernel 5.10-rc1Affected

References

https://bugzilla.redhat.com/show_bug.cgi?id=1900844
https://www.openwall.com/lists/oss-security/2020/10/09/1
https://www.openwall.com/lists/oss-security/2020/11/23/2
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764

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