CVE-2020-27777
Medium
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.
SeverityMedium
CVSS6.7
Exploit probability—
Product
Linux Kernel
PublishedDec 15, 2020
First seenDec 15, 2020
Weakness typeCWE-862Missing authorization
How to fix
Update
- linux linux_kernel4.14.204, 4.19.155, 5.4.75, 5.9.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 4.14.204, 4.15 ≤ v < 4.19.155, 4.20 ≤ v < 5.4.75, 5.5 ≤ v < 5.9.5 | 4.14.204, 4.19.155, 5.4.75, 5.9.5 |
| redhat openshift_container_platform | 4.4, 4.5, 4.6 | — |
| redhat enterprise_linux | 5.0, 6.0, 7.0, 8.0 | — |
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