Vulnerability · Published Dec 15, 2020 · Assigned by redhat
CVE-2020-27777
Medium 6.7
In plain English
A medium-severity missing authorization in kernel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)6.7Medium
Exploit odds (30 days)0.5%top 58.7% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-348.el8 | ALSA-2021:4356 |
| Debian:12 | linux | 5.9.6-1 | DEBIAN-CVE-2020-27777 |
| Debian:13 | linux | 5.9.6-1 | DEBIAN-CVE-2020-27777 |
| Debian:14 | linux | 5.9.6-1 | DEBIAN-CVE-2020-27777 |
| Ubuntu:22.04:LTS | linux-intel-iot-realtime | no fix listed | UBUNTU-CVE-2020-27777 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2020-27777 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2020-27777 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2020-27777 |
Affected products (as reported)
Weakness: CWE-862
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1900844 x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2020/10/09/1 x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2020/11/23/2 x_refsource_MISC
- https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?h=next&id=bd59380c5ba4147dcbaad3e582b55ccfd120b764 x_refsource_MISC