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):

• An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of Load & Store instructions (a commonly used performance optimization). It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory read from address to which a recent memory write has occurred may see an older value and subsequently cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to read privileged memory by conducting targeted cache side-channel attacks. (CVE-2018-3639)
  

Note: This is the qemu-kvm side of the CVE-2018-3639 mitigation.

• QEMU: cirrus: OOB access when updating VGA display (CVE-2018-7858)
  
• QEMU: vga: OOB read access during display update (CVE-2017-13672)
  
• Qemu: Out-of-bounds read in vga_draw_text routine (CVE-2018-5683)
  

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

Red Hat would like to thank Ken Johnson (Microsoft Security Response Center) and Jann Horn (Google Project Zero) for reporting CVE-2018-3639; Ross Lagerwall (Citrix.com) for reporting CVE-2018-7858; David Buchanan for reporting CVE-2017-13672; and Jiang Xin and Lin ZheCheng for reporting CVE-2018-5683.

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 - 1486560 - CVE-2017-13672 QEMU: vga: OOB read access during display update
• BZ - 1530356 - CVE-2018-5683 Qemu: Out-of-bounds read in vga_draw_text routine
• BZ - 1553402 - CVE-2018-7858 QEMU: cirrus: OOB access when updating VGA display
• BZ - 1566890 - CVE-2018-3639 hw: cpu: speculative store bypass

CVEs

• CVE-2017-13672
• CVE-2018-3639
• CVE-2018-5683
• CVE-2018-7858

References

• https://access.redhat.com/security/updates/classification/#important
• https://access.redhat.com/security/vulnerabilities/ssbd

Red Hat Enterprise Linux Server 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.1.src.rpm	SHA-256: 696dba9e43ea3d7f14e75d6ca5e033c99c7cfc8ee0c7df337b9b511e73b3210e
x86_64
qemu-guest-agent-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 19d6ca8977dfcc6d7c3a3ae1630514d27e5cabe67e94b3e6defe47794f9ecfa2
qemu-img-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 20321a931fe18a96b889bbb13f4d63fa55e6d883664ad7dc24bdad2f3a1e53c2
qemu-kvm-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: b9ffeddf40fcfe810c4e23fda47ad7aaba5d1439f1f2fa07cada214e17ceefe1
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 0443c54b95bc6e29ff4f6b4e0cf52382c9244daab341d2ee721c86ca950bf643
qemu-kvm-tools-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 841850176257c351d235baca167036c930fcc53a20b3123d93bbfbe0ecadcaad
i386
qemu-guest-agent-0.12.1.2-2.506.el6_10.1.i686.rpm	SHA-256: 1612baf0513ee7354cc73b1f6c5727e20af330380350705ad9ec7f2dff0371e5
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.1.i686.rpm	SHA-256: b638da296cc21a6b980727d77ab71cefa23e1728094c4ae82af72eb48c23cf0b

Red Hat Enterprise Linux Workstation 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.1.src.rpm	SHA-256: 696dba9e43ea3d7f14e75d6ca5e033c99c7cfc8ee0c7df337b9b511e73b3210e
x86_64
qemu-guest-agent-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 19d6ca8977dfcc6d7c3a3ae1630514d27e5cabe67e94b3e6defe47794f9ecfa2
qemu-img-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 20321a931fe18a96b889bbb13f4d63fa55e6d883664ad7dc24bdad2f3a1e53c2
qemu-kvm-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: b9ffeddf40fcfe810c4e23fda47ad7aaba5d1439f1f2fa07cada214e17ceefe1
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 0443c54b95bc6e29ff4f6b4e0cf52382c9244daab341d2ee721c86ca950bf643
qemu-kvm-tools-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 841850176257c351d235baca167036c930fcc53a20b3123d93bbfbe0ecadcaad
i386
qemu-guest-agent-0.12.1.2-2.506.el6_10.1.i686.rpm	SHA-256: 1612baf0513ee7354cc73b1f6c5727e20af330380350705ad9ec7f2dff0371e5
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.1.i686.rpm	SHA-256: b638da296cc21a6b980727d77ab71cefa23e1728094c4ae82af72eb48c23cf0b

Red Hat Enterprise Linux Desktop 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.1.src.rpm	SHA-256: 696dba9e43ea3d7f14e75d6ca5e033c99c7cfc8ee0c7df337b9b511e73b3210e
x86_64
qemu-guest-agent-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 19d6ca8977dfcc6d7c3a3ae1630514d27e5cabe67e94b3e6defe47794f9ecfa2
qemu-img-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 20321a931fe18a96b889bbb13f4d63fa55e6d883664ad7dc24bdad2f3a1e53c2
qemu-kvm-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: b9ffeddf40fcfe810c4e23fda47ad7aaba5d1439f1f2fa07cada214e17ceefe1
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 0443c54b95bc6e29ff4f6b4e0cf52382c9244daab341d2ee721c86ca950bf643
qemu-kvm-tools-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 841850176257c351d235baca167036c930fcc53a20b3123d93bbfbe0ecadcaad
i386
qemu-guest-agent-0.12.1.2-2.506.el6_10.1.i686.rpm	SHA-256: 1612baf0513ee7354cc73b1f6c5727e20af330380350705ad9ec7f2dff0371e5
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.1.i686.rpm	SHA-256: b638da296cc21a6b980727d77ab71cefa23e1728094c4ae82af72eb48c23cf0b

Red Hat Enterprise Linux for Power, big endian 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.1.src.rpm	SHA-256: 696dba9e43ea3d7f14e75d6ca5e033c99c7cfc8ee0c7df337b9b511e73b3210e
ppc64
qemu-guest-agent-0.12.1.2-2.506.el6_10.1.ppc64.rpm	SHA-256: bb0aca27a9150d5074ea9ff240dbb415491443d9f182158f4f45016f6b0d9596
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.1.ppc64.rpm	SHA-256: 72e7af362d539f2e7f5d3e9a8bd66edd9f7b2dc2841579c1475ba27f57ba85a0

Red Hat Enterprise Linux for Scientific Computing 6

SRPM
qemu-kvm-0.12.1.2-2.506.el6_10.1.src.rpm	SHA-256: 696dba9e43ea3d7f14e75d6ca5e033c99c7cfc8ee0c7df337b9b511e73b3210e
x86_64
qemu-guest-agent-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 19d6ca8977dfcc6d7c3a3ae1630514d27e5cabe67e94b3e6defe47794f9ecfa2
qemu-img-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 20321a931fe18a96b889bbb13f4d63fa55e6d883664ad7dc24bdad2f3a1e53c2
qemu-kvm-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: b9ffeddf40fcfe810c4e23fda47ad7aaba5d1439f1f2fa07cada214e17ceefe1
qemu-kvm-debuginfo-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 0443c54b95bc6e29ff4f6b4e0cf52382c9244daab341d2ee721c86ca950bf643
qemu-kvm-tools-0.12.1.2-2.506.el6_10.1.x86_64.rpm	SHA-256: 841850176257c351d235baca167036c930fcc53a20b3123d93bbfbe0ecadcaad