type: security
subject: Updated kernel packages fix security vulnerability
CVE:
 - CVE-2018-12126
 - CVE-2018-12127
 - CVE-2018-12130
 - CVE-2019-11091
src:
  6:
   core:
     - kernel-4.14.119-1.mga6
     - kernel-userspace-headers-4.14.119-1.mga6
     - kmod-vboxadditions-6.0.6-3.mga6
     - kmod-virtualbox-6.0.6-3.mga6
     - kmod-xtables-addons-2.13-85.mga6
description: |
  This kernel update provides the upstream 4.14.119 that adds the kernel side
  mitigations for the Microarchitectural Data Sampling (MDS, also called
  ZombieLoad attack) vulnerabilities in Intel processors that can allow
  attackers to retrieve data being processed inside a CPU. To complete the
  mitigations new microcode is also needed, either by installing the
  microcode-0.20190514-1.mga6 package, or get an updated bios / uefi
  firmware from the motherboard vendor.

  The fixed / mitigated issues are:

  Modern Intel microprocessors implement hardware-level micro-optimizations
  to improve the performance of writing data back to CPU caches. The write
  operation is split into STA (STore Address) and STD (STore Data)
  sub-operations. These sub-operations allow the processor to hand-off
  address generation logic into these sub-operations for optimized writes.
  Both of these sub-operations write to a shared distributed processor
  structure called the 'processor store buffer'. As a result, an
  unprivileged attacker could use this flaw to read private data resident
  within the CPU's processor store buffer. (CVE-2018-12126)

  Microprocessors use a ‘load port’ subcomponent to perform load operations
  from memory or IO. During a load operation, the load port receives data
  from the memory or IO subsystem and then provides the data to the CPU
  registers and operations in the CPU’s pipelines. Stale load operations
  results are stored in the 'load port' table until overwritten by newer
  operations. Certain load-port operations triggered by an attacker can be
  used to reveal data about previous stale requests leaking data back to the
  attacker via a timing side-channel. (CVE-2018-12127)

  A flaw was found in the implementation of the "fill buffer", a mechanism
  used by modern CPUs when a cache-miss is made on L1 CPU cache. If an
  attacker can generate a load operation that would create a page fault,
  the execution will continue speculatively with incorrect data from the
  fill buffer while the data is fetched from higher level caches. This
  response time can be measured to infer data in the fill buffer.
  (CVE-2018-12130)

  Uncacheable memory on some microprocessors utilizing speculative execution
  may allow an authenticated user to potentially enable information disclosure
  via a side channel with local access. (CVE-2019-11091)
references:
 - https://bugs.mageia.org/show_bug.cgi?id=24820
 - https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html
 - https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.117
 - https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.118
 - https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.119
ID: MGASA-2019-0174