Debian: DSA-4187-1 Critical Linux Kernel Escalation Risks

CVE-2015-9016

Ming Lei reported a race condition in the multiqueue block layer
(blk-mq). On a system with a driver using blk-mq (mtip32xx,
null_blk, or virtio_blk), a local user might be able to use this
for denial of service or possibly for privilege escalation.

CVE-2017-0861

Robb Glasser reported a potential use-after-free in the ALSA (sound)
PCM core. We believe this was not possible in practice.

CVE-2017-5715

Multiple researchers have discovered a vulnerability in various
processors supporting speculative execution, enabling an attacker
controlling an unprivileged process to read memory from arbitrary
addresses, including from the kernel and all other processes
running on the system.

This specific attack has been named Spectre variant 2 (branch
target injection) and is mitigated for the x86 architecture (amd64
and i386) by using the "retpoline" compiler feature which allows
indirect branches to be isolated from speculative execution.

C...