CVE-2020-27777
medium
CVSS v3
—
CVSS v2
—
VIR risk
5.5
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.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: alma — https://errata.almalinux.org/8/ALSA-2021-4356.html
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2020-27777
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2020-27777.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| debian | bookworm | fixed | 5.9.6-1 |
| debian | bullseye | fixed | 5.9.6-1 |
| debian | forky | fixed | 5.9.6-1 |
| debian | sid | fixed | 5.9.6-1 |
| debian | trixie | fixed | 5.9.6-1 |
References
Verify integrity in audit chain (admin only). AS-IS.