CVE-2020-10766

Se encontró un fallo de bug lógico en el kernel de Linux versiones anteriores a 5.8-rc1, en la implementación de SSBD. Un error en el manejo lógico permite a un atacante con una cuenta local desactivar la protección SSBD durante un cambio de contexto cuando las mitigaciones de ejecución especulativa adicionales están presentes. Este problema fue introducido cuando la conmutación STIPB condicional fue incorporada a la conmutación SSBD existente. La mayor amenaza de esta vulnerabilidad es la confidencialidad

A logic bug flaw was found in the Linux kernel’s implementation of SSBD. A bug in the logic handling allows an attacker with a local account to disable SSBD protection during a context switch when additional speculative execution mitigations are in place. This issue was introduced when the per task/process conditional STIPB switching was added on top of the existing SSBD switching. The highest threat from this vulnerability is to confidentiality.

It was discovered that the network block device implementation in the Linux kernel did not properly check for error conditions in some situations. An attacker could possibly use this to cause a denial of service. It was discovered that the btrfs file system implementation in the Linux kernel did not properly validate file system metadata in some situations. An attacker could use this to construct a malicious btrfs image that, when mounted, could cause a denial of service. Various other issues were also addressed.