CVE-2019-19058

Una pérdida de memoria en la función alloc_sgtable() en el archivo drivers/net/wireless/intel/iwlwifi/fw/dbg.c en el kernel de Linux versiones hasta la versión 5.3.11, permite a atacantes causar una denegación de servicio (consumo de memoria) al desencadenar fallos de la función alloc_page() , también se conoce como CID-b4b814fec1a5.

A flaw was found in the Linux kernel. The Intel Wireless WiFi MVM Firmware driver mishandles resource cleanup during device coredump. An attacker able to trigger the device coredump and system-wide out of memory conditions at the same time could use this flaw to crash the system. The highest threat from this vulnerability is to system availability.

It was discovered that the KVM implementation in the Linux kernel, when paravirtual TLB flushes are enabled in guests, the hypervisor in some situations could miss deferred TLB flushes or otherwise mishandle them. An attacker in a guest VM could use this to expose sensitive information. Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested guest access the resources of a parent guest in certain situations. An attacker could use this to expose sensitive information. Various other issues were also addressed.