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CVE-2018-10901

Description

A flaw was found in Linux kernel's KVM virtualization subsystem. The VMX code does not restore the GDT.LIMIT to the previous host value, but instead sets it to 64KB. With a corrupted GDT limit a host's userspace code has an ability to place malicious entries in the GDT, particularly to the per-cpu variables. An attacker can use this to escalate their privileges.

POC

Reference

- https://access.redhat.com/errata/RHSA-2018:2393

- https://help.ecostruxureit.com/display/public/UADCE725/Security+fixes+in+StruxureWare+Data+Center+Expert+v7.6.0

- https://www.oracle.com/security-alerts/cpujul2020.html

- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html

Github

No PoCs found on GitHub currently.