Advisory Published

USN-3651-1: QEMU update

First published: Mon May 21 2018(Updated: )

Ken Johnson and Jann Horn independently discovered that microprocessors utilizing speculative execution of a memory read may allow unauthorized memory reads via sidechannel attacks. An attacker in the guest could use this to expose sensitive guest information, including kernel memory. This update allows QEMU to expose new CPU features added by microcode updates to guests on amd64 and i386.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/qemu<1:2.11+dfsg-1ubuntu7.2
1:2.11+dfsg-1ubuntu7.2
=18.04
All of
ubuntu/qemu-system<1:2.11+dfsg-1ubuntu7.2
1:2.11+dfsg-1ubuntu7.2
=18.04
All of
ubuntu/qemu-system-x86<1:2.11+dfsg-1ubuntu7.2
1:2.11+dfsg-1ubuntu7.2
=18.04
All of
ubuntu/qemu<1:2.10+dfsg-0ubuntu3.7
1:2.10+dfsg-0ubuntu3.7
=17.10
All of
ubuntu/qemu-system<1:2.10+dfsg-0ubuntu3.7
1:2.10+dfsg-0ubuntu3.7
=17.10
All of
ubuntu/qemu-system-x86<1:2.10+dfsg-0ubuntu3.7
1:2.10+dfsg-0ubuntu3.7
=17.10
All of
ubuntu/qemu<1:2.5+dfsg-5ubuntu10.29
1:2.5+dfsg-5ubuntu10.29
=16.04
All of
ubuntu/qemu-system<1:2.5+dfsg-5ubuntu10.29
1:2.5+dfsg-5ubuntu10.29
=16.04
All of
ubuntu/qemu-system-x86<1:2.5+dfsg-5ubuntu10.29
1:2.5+dfsg-5ubuntu10.29
=16.04
All of
ubuntu/qemu<2.0.0+dfsg-2ubuntu1.42
2.0.0+dfsg-2ubuntu1.42
=14.04
All of
ubuntu/qemu-system<2.0.0+dfsg-2ubuntu1.42
2.0.0+dfsg-2ubuntu1.42
=14.04
All of
ubuntu/qemu-system-x86<2.0.0+dfsg-2ubuntu1.42
2.0.0+dfsg-2ubuntu1.42
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this update?

    The vulnerability ID for this update is CVE-2018-3639.

  • What is the title of this update?

    The title of this update is USN-3651-1: QEMU update.

  • Who discovered this vulnerability?

    Ken Johnson and Jann Horn independently discovered this vulnerability.

  • What is the severity of this vulnerability?

    The severity of this vulnerability is not mentioned in the information provided.

  • How can an attacker exploit this vulnerability?

    An attacker in the guest could use this vulnerability to expose sensitive guest information, including kernel memory.

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