CVE-2021-38208

El archivo net/nfc/llcp_sock.c en el kernel de Linux versiones anteriores a 5.12.10, permite a los usuarios locales no privilegiados causar una denegación de servicio (desreferencia del puntero NULL y BUG) al hacer una llamada getsockname después de cierto tipo de fallo de una llamada de enlace

It was discovered that the bluetooth subsystem in the Linux kernel did not properly perform access control. An authenticated attacker could possibly use this to expose sensitive information. Michael Brown discovered that the Xen netback driver in the Linux kernel did not properly handle malformed packets from a network PV frontend, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.