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.

• CWE-862

• https://bugzilla.redhat.com/show_bug.cgi?id=1900844Issue Tracking, Patch, Third Party Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764Exploit, Patch, Vendor Advisory
• https://www.openwall.com/lists/oss-security/2020/10/09/1Exploit, Mailing List, Patch, Third Party Advisory
• https://www.openwall.com/lists/oss-security/2020/11/23/2Mailing List, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1900844Issue Tracking, Patch, Third Party Advisory
• https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764Exploit, Patch, Vendor Advisory
• https://www.openwall.com/lists/oss-security/2020/10/09/1Exploit, Mailing List, Patch, Third Party Advisory
• https://www.openwall.com/lists/oss-security/2020/11/23/2Mailing List, Third Party Advisory

Published

Dec 15, 2020

Last Modified

Jun 17, 2026

Status

Modified

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