medium6.7
CVE-2020-27777
A flaw was found in the way RTAS handled memory accesses in userspace to kernel communication.
Impact
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 products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | before 4.14.204 from 4.15 before 4.19.155 from 4.20 before 5.4.75 from 5.5 before 5.9.5 |
| Redhat | Openshift Container Platform | Versions 4.4, 4.5, 4.6 |
| Redhat | Enterprise Linux | Versions 5.0, 6.0, 7.0, 8.0 |
Weakness classification
References
- NVD record
- CVE.org record
- 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