First published: Sat Dec 19 2015(Updated: )
Felix Wilhelm discovered a race condition in the Xen paravirtualized drivers which can cause double fetch vulnerabilities. An attacker in the paravirtualized guest could exploit this flaw to cause a denial of service (crash the host) or potentially execute arbitrary code on the host. (CVE-2015-8550) Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform consistency checks on the device's state. An attacker could exploit this flaw to cause a denial of service (NULL dereference) on the host. (CVE-2015-8551) Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not perform consistency checks on the device's state. An attacker could exploit this flaw to cause a denial of service by flooding the logging system with WARN() messages causing the initial domain to exhaust disk space. (CVE-2015-8552) Jann Horn discovered a ptrace issue with user namespaces in the Linux kernel. The namespace owner could potentially exploit this flaw by ptracing a root owned process entering the user namespace to elevate its privileges and potentially gain access outside of the namespace. (http://bugs.launchpad.net/bugs/1527374, CVE-2015-8709)
Affected Software | Affected Version | How to fix |
---|---|---|
All of | ||
ubuntu/linux-image-3.16.0-57-generic | <3.16.0-57.77~14.04.1 | 3.16.0-57.77~14.04.1 |
=14.04 | ||
All of | ||
ubuntu/linux-image-3.16.0-57-generic-lpae | <3.16.0-57.77~14.04.1 | 3.16.0-57.77~14.04.1 |
=14.04 | ||
All of | ||
ubuntu/linux-image-3.16.0-57-lowlatency | <3.16.0-57.77~14.04.1 | 3.16.0-57.77~14.04.1 |
=14.04 | ||
All of | ||
ubuntu/linux-image-3.16.0-57-powerpc-e500mc | <3.16.0-57.77~14.04.1 | 3.16.0-57.77~14.04.1 |
=14.04 | ||
All of | ||
ubuntu/linux-image-3.16.0-57-powerpc-smp | <3.16.0-57.77~14.04.1 | 3.16.0-57.77~14.04.1 |
=14.04 | ||
All of | ||
ubuntu/linux-image-3.16.0-57-powerpc64-emb | <3.16.0-57.77~14.04.1 | 3.16.0-57.77~14.04.1 |
=14.04 | ||
All of | ||
ubuntu/linux-image-3.16.0-57-powerpc64-smp | <3.16.0-57.77~14.04.1 | 3.16.0-57.77~14.04.1 |
=14.04 |
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(Contains the following vulnerabilities)
The severity of CVE-2015-8550 is high.
An attacker in the paravirtualized guest could exploit CVE-2015-8550 to cause a denial of service or potentially execute arbitrary code on the host.
Ubuntu 14.04 is affected by CVE-2015-8550.
To fix the vulnerability in Ubuntu 14.04, update the linux-image-3.16.0-57-generic package to version 3.16.0-57.77~14.04.1 or later.