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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
6.7 MEDIUM
LOCAL
LOW
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
redhatCNA
---
---
CVEADP
---
---
Base Score
CVSS 3.x
EPSS Score
Percentile: 6%
VendorProductVersion
linuxlinux_kernel
𝑥
< 4.14.204
linuxlinux_kernel
4.15 ≤
𝑥
< 4.19.155
linuxlinux_kernel
4.20 ≤
𝑥
< 5.4.75
linuxlinux_kernel
5.5 ≤
𝑥
< 5.9.5
redhatopenshift_container_platform
4.4
redhatopenshift_container_platform
4.5
redhatopenshift_container_platform
4.6
redhatenterprise_linux
5.0
redhatenterprise_linux
6.0
redhatenterprise_linux
7.0
redhatenterprise_linux
8.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
linux
bullseye
5.10.223-1
fixed
stretch
ignored
bullseye (security)
5.10.226-1
fixed
bookworm
6.1.106-3
fixed
bookworm (security)
6.1.112-1
fixed
trixie
6.11.5-1
fixed
sid
6.11.6-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
linux
groovy
Fixed 5.8.0-44.50
released
focal
Fixed 5.4.0-59.65
released
bionic
Fixed 4.15.0-129.132
released
xenial
Fixed 4.4.0-201.233
released
trusty
ignored
linux-aws
groovy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
not-affected
linux-aws-5.0
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-aws-5.3
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-aws-5.4
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-aws-hwe
groovy
dne
focal
dne
bionic
dne
xenial
not-affected
trusty
dne
linux-azure
groovy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
not-affected
linux-azure-4.15
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-azure-5.3
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-azure-5.4
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-azure-edge
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-dell300x
groovy
dne
focal
dne
bionic
Fixed 4.15.0-1010.14
released
xenial
dne
trusty
dne
linux-gcp
groovy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
dne
linux-gcp-4.15
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-gcp-5.3
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-gcp-5.4
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-gcp-edge
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-gke-4.15
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-gke-5.0
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-gke-5.3
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-gke-5.4
groovy
dne
focal
dne
bionic
Fixed 5.4.0-1033.35~18.04.1
released
xenial
dne
trusty
dne
linux-gkeop
groovy
dne
focal
not-affected
bionic
dne
xenial
dne
trusty
dne
linux-gkeop-5.4
groovy
dne
focal
dne
bionic
Fixed 5.4.0-1008.9~18.04.1
released
xenial
dne
trusty
dne
linux-hwe
groovy
dne
focal
dne
bionic
ignored
xenial
Fixed 4.15.0-129.132~16.04.1
released
trusty
dne
linux-hwe-5.4
groovy
dne
focal
dne
bionic
Fixed 5.4.0-59.65~18.04.1
released
xenial
dne
trusty
dne
linux-hwe-5.8
groovy
dne
focal
Fixed 5.8.0-44.50~20.04.1
released
bionic
dne
xenial
dne
trusty
dne
linux-hwe-edge
groovy
dne
focal
dne
bionic
ignored
xenial
ignored
trusty
dne
linux-kvm
groovy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
dne
linux-lts-trusty
groovy
dne
focal
dne
bionic
dne
xenial
dne
trusty
dne
linux-lts-xenial
groovy
dne
focal
dne
bionic
dne
xenial
dne
trusty
Fixed 4.4.0-201.233~14.04.1
released
linux-oem
groovy
dne
focal
dne
bionic
not-affected
xenial
not-affected
trusty
dne
linux-oem-5.10
groovy
dne
focal
not-affected
bionic
dne
xenial
dne
trusty
dne
linux-oem-5.6
groovy
dne
focal
not-affected
bionic
dne
xenial
dne
trusty
dne
linux-oem-osp1
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-oracle
groovy
not-affected
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
dne
linux-oracle-5.0
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-oracle-5.3
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-oracle-5.4
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-raspi
groovy
not-affected
focal
not-affected
bionic
dne
xenial
dne
trusty
dne
linux-raspi-5.4
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-raspi2
groovy
dne
focal
not-affected
bionic
not-affected
xenial
not-affected
trusty
dne
linux-raspi2-5.3
groovy
dne
focal
dne
bionic
not-affected
xenial
dne
trusty
dne
linux-riscv
groovy
not-affected
focal
not-affected
bionic
dne
xenial
dne
trusty
dne
linux-snapdragon
groovy
dne
focal
dne
bionic
not-affected
xenial
not-affected
trusty
dne
Common Weakness Enumeration
References
https://bugzilla.redhat.com/show_bug.cgi?id=1900844
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764
https://www.openwall.com/lists/oss-security/2020/10/09/1
https://www.openwall.com/lists/oss-security/2020/11/23/2
https://bugzilla.redhat.com/show_bug.cgi?id=1900844
https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764
https://www.openwall.com/lists/oss-security/2020/10/09/1
https://www.openwall.com/lists/oss-security/2020/11/23/2