CVE-2021-3656 - Redhat Enterprise Linux For Real Time Tus, Redhat Enterprise Linux Server Tus and Redhat Enterprise Linux Server Update Services For Sap Solutions
A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.
Affected software
Redhat Enterprise Linux For Real Time Tus
Redhat Enterprise Linux Server Tus
Redhat Enterprise Linux Server Update Services For Sap Solutions
Redhat Virtualization Host
Redhat Enterprise Linux For Scientific Computing
Redhat Enterprise Linux For Real Time For Nfv Tus
Redhat Codeready Linux Builder
Redhat Enterprise Linux Server Aus
Redhat Enterprise Linux Eus
Redhat Enterprise Linux For Real Time
Redhat Enterprise Linux For Power Little Endian
Redhat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions
Redhat Enterprise Linux For Power Little Endian Eus
Redhat Enterprise Linux Workstation
Redhat Enterprise Linux Desktop
Redhat Software Collections
Redhat Enterprise Linux Server
Redhat Openstack
Redhat Enterprise Linux For Ibm Z Systems
Redhat Enterprise Linux
Linux Linux Kernel
Fedoraproject Fedora
Redhat Enterprise Linux For Real Time For Nfv
Redhat 3scale Api Management
Redhat Enterprise Linux For Ibm Z Systems Eus
Redhat Enterprise Linux For Power Big Endian