VulnerabilityModified
CVE-2020-27777
A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication.
MEDIUM 6.7EPSS 0.48%
Does this matter?
Lower severity and a low EPSS score (0.48%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.7 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.48% probability · 40th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-862
- Affected
- linux/linux kernel · redhat/openshift container platform · redhat/enterprise linux
- Source
- secalert@redhat.com
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.