CVE-2021-3653

Se ha encontrado un fallo en el código AMD de KVM para soportar la virtualización anidada SVM. El fallo se produce cuando se procesa el VMCB (bloque de control de la máquina virtual) proporcionado por el huésped L1 para generar/manejar un huésped anidado (L2). Debido a que no se comprueba correctamente el campo "int_ctl", este problema podría permitir a un L1 malicioso habilitar el soporte AVIC (Advanced Virtual Interrupt Controller) para el huésped L2. Como resultado, el invitado L2 podría leer/escribir páginas físicas del anfitrión, resultando en un bloqueo de todo el sistema, un filtrado de datos confidenciales o un posible escape del invitado al anfitrión. Este fallo afecta a las versiones del kernel de Linux anteriores a 5.14-rc7

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 "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) 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.

Red Hat Advanced Cluster Management for Kubernetes 2.3.3 images Red Hat Advanced Cluster Management for Kubernetes provides the capabilities to address common challenges that administrators and site reliability engineers face as they work across a range of public and private cloud environments. Clusters and applications are all visible and managed from a single console—with security policy built in. This advisory contains the container images for Red Hat Advanced Cluster Management for Kubernetes, which fix several bugs and provide security updates. Issues addressed include denial of service, information leakage, integer overflow, and out of bounds read vulnerabilities.