Debian: DSA-4667-1 Critical: Linux Kernel Escalation and DoS Issues

CVE-2020-2732

Paulo Bonzini discovered that the KVM implementation for Intel
processors did not properly handle instruction emulation for L2
guests when nested virtualization is enabled. This could allow
an L2 guest to cause privilege escalation, denial of service,
or information leaks in the L1 guest.

CVE-2020-8428

Al Viro discovered a use-after-free vulnerability in the VFS
layer. This allowed local users to cause a denial-of-service
(crash) or obtain sensitive information from kernel memory.

CVE-2020-10942

It was discovered that the vhost_net driver did not properly
validate the type of sockets set as back-ends. A local user
permitted to access /dev/vhost-net could use this to cause a stack
corruption via crafted system calls, resulting in denial of
service (crash) or possibly privilege escalation.

CVE-2020-11565

Entropy Moe reported that the shared memory filesystem (tmpfs) did
not correctly handle an "mpol" mount option specifying an...