CVE-2020-27777

Public Exploit

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.

Category

6.7
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.03%
Vendor Advisory kernel.org
Affected: n/a kernel
Published at:
Updated at:

References

Link Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1900844 issue tracking third party advisory patch
https://www.openwall.com/lists/oss-security/2020/10/09/1 mailing list patch exploit third party advisory
https://www.openwall.com/lists/oss-security/2020/11/23/2 third party advisory mailing list
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764 exploit patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-27777?
CVE-2020-27777 has been scored as a medium severity vulnerability.
How to fix CVE-2020-27777?
To fix CVE-2020-27777, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-27777 being actively exploited in the wild?
It is possible that CVE-2020-27777 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-27777?
CVE-2020-27777 affects n/a kernel.
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