Issued:
2019-05-14
Updated:
2019-05-14

RHSA-2019:1181 - Security Advisory

Synopsis

Important: qemu-kvm security update

Type/Severity

Security Advisory: Important

Topic

An update for qemu-kvm is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

Kernel-based Virtual Machine (KVM) is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM.

Security Fix(es):

  • 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)
  • 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)
  • 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)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, shut down all running virtual machines. Once all virtual machines have shut down, start them again for this update to take effect.

Affected Products

  • Red Hat Enterprise Linux Server 6 x86_64
  • Red Hat Enterprise Linux Server 6 i386
  • Red Hat Enterprise Linux Workstation 6 x86_64
  • Red Hat Enterprise Linux Workstation 6 i386
  • Red Hat Enterprise Linux Desktop 6 x86_64
  • Red Hat Enterprise Linux Desktop 6 i386
  • Red Hat Enterprise Linux for Power, big endian 6 ppc64
  • Red Hat Enterprise Linux for Scientific Computing 6 x86_64

Fixes

  • BZ - 1646781 - CVE-2018-12126 hardware: Microarchitectural Store Buffer Data Sampling (MSBDS)
  • BZ - 1646784 - CVE-2018-12130 hardware: Microarchitectural Fill Buffer Data Sampling (MFBDS)
  • BZ - 1667782 - CVE-2018-12127 hardware: Micro-architectural Load Port Data Sampling - Information Leak (MLPDS)
  • BZ - 1705312 - CVE-2019-11091 hardware: Microarchitectural Data Sampling Uncacheable Memory (MDSUM)

CVEs

References

Red Hat Enterprise Linux Server 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.3.src.rpm SHA-256: 7e21e829f961a2d2b08387448129e1721b69488e37b9231fcb0934477612b8da
x86_64
qemu-guest-agent-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 2f695e6a09c40a52df29379c1412d95702da7535b8d5116ad003cdf0301123c2
qemu-img-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: b2147dafefac4e8d2f19e39d24d7b22ba1e1f15e6a46f09e73c479ba8aba3eaf
qemu-kvm-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 4dfc667101b01cd1f91392d2b5dc572149e917ca30676e3a89a3ccb1aab9cbb8
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: dbed218cc220b3a79f2d3926b47745991230b7b822d623b965b3b4a521daa348
qemu-kvm-tools-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 69159b17a2d1a2e523342bd2340c306a47a9d6bf9027d54b02157a48a335571b
i386
qemu-guest-agent-0.12.1.2-2.506.el6_10.3.i686.rpm SHA-256: d8fc676d7c392caa028cd7e2007792b9b4bab6d37fc07a1707bcb786ff306d97
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3.i686.rpm SHA-256: 7ff8539a9d175ce8e8ad206431f40a69fef6f04d5ba4d08174f4d5e71157bf1f

Red Hat Enterprise Linux Workstation 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.3.src.rpm SHA-256: 7e21e829f961a2d2b08387448129e1721b69488e37b9231fcb0934477612b8da
x86_64
qemu-guest-agent-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 2f695e6a09c40a52df29379c1412d95702da7535b8d5116ad003cdf0301123c2
qemu-img-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: b2147dafefac4e8d2f19e39d24d7b22ba1e1f15e6a46f09e73c479ba8aba3eaf
qemu-kvm-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 4dfc667101b01cd1f91392d2b5dc572149e917ca30676e3a89a3ccb1aab9cbb8
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: dbed218cc220b3a79f2d3926b47745991230b7b822d623b965b3b4a521daa348
qemu-kvm-tools-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 69159b17a2d1a2e523342bd2340c306a47a9d6bf9027d54b02157a48a335571b
i386
qemu-guest-agent-0.12.1.2-2.506.el6_10.3.i686.rpm SHA-256: d8fc676d7c392caa028cd7e2007792b9b4bab6d37fc07a1707bcb786ff306d97
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3.i686.rpm SHA-256: 7ff8539a9d175ce8e8ad206431f40a69fef6f04d5ba4d08174f4d5e71157bf1f

Red Hat Enterprise Linux Desktop 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.3.src.rpm SHA-256: 7e21e829f961a2d2b08387448129e1721b69488e37b9231fcb0934477612b8da
x86_64
qemu-guest-agent-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 2f695e6a09c40a52df29379c1412d95702da7535b8d5116ad003cdf0301123c2
qemu-img-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: b2147dafefac4e8d2f19e39d24d7b22ba1e1f15e6a46f09e73c479ba8aba3eaf
qemu-kvm-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 4dfc667101b01cd1f91392d2b5dc572149e917ca30676e3a89a3ccb1aab9cbb8
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: dbed218cc220b3a79f2d3926b47745991230b7b822d623b965b3b4a521daa348
qemu-kvm-tools-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 69159b17a2d1a2e523342bd2340c306a47a9d6bf9027d54b02157a48a335571b
i386
qemu-guest-agent-0.12.1.2-2.506.el6_10.3.i686.rpm SHA-256: d8fc676d7c392caa028cd7e2007792b9b4bab6d37fc07a1707bcb786ff306d97
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3.i686.rpm SHA-256: 7ff8539a9d175ce8e8ad206431f40a69fef6f04d5ba4d08174f4d5e71157bf1f

Red Hat Enterprise Linux for Power, big endian 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.3.src.rpm SHA-256: 7e21e829f961a2d2b08387448129e1721b69488e37b9231fcb0934477612b8da
ppc64
qemu-guest-agent-0.12.1.2-2.506.el6_10.3.ppc64.rpm SHA-256: 7a9bccf6204e9ce28433a96f1208986a435329e7338aefff2f95aeb65de4008e
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3.ppc64.rpm SHA-256: 29dec82a1db78fb1ef64092bc7c73827794d88096a726a6539309dfe5c13c715

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.3.src.rpm SHA-256: 7e21e829f961a2d2b08387448129e1721b69488e37b9231fcb0934477612b8da
x86_64
qemu-guest-agent-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 2f695e6a09c40a52df29379c1412d95702da7535b8d5116ad003cdf0301123c2
qemu-img-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: b2147dafefac4e8d2f19e39d24d7b22ba1e1f15e6a46f09e73c479ba8aba3eaf
qemu-kvm-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 4dfc667101b01cd1f91392d2b5dc572149e917ca30676e3a89a3ccb1aab9cbb8
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: dbed218cc220b3a79f2d3926b47745991230b7b822d623b965b3b4a521daa348
qemu-kvm-tools-0.12.1.2-2.506.el6_10.3.x86_64.rpm SHA-256: 69159b17a2d1a2e523342bd2340c306a47a9d6bf9027d54b02157a48a335571b

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.