Debian: DSA-3633-1 Critical: Xen Denial Of Service And Escalation

Multiple vulnerabilities have been discovered in the Xen hypervisor. The
Common Vulnerabilities and Exposures project identifies the following
problems:

CVE-2015-8338

Julien Grall discovered that Xen on ARM was susceptible to denial
of service via long running memory operations.

CVE-2016-4480

Jan Beulich discovered that incorrect page table handling could
result in privilege escalation inside a Xen guest instance.

CVE-2016-4962

Wei Liu discovered multiple cases of missing input sanitising in
libxl which could result in denial of service.

CVE-2016-5242

Aaron Cornelius discovered that incorrect resource handling on
ARM systems could result in denial of service.

CVE-2016-6258

Jeremie Boutoille discovered that incorrect pagetable handling in
PV instances could result in guest to host privilege escalation.

For the stable distribution (jessie), these problems have been fixed in
version 4.4.1-9+deb8u6.

For the unstable distribution (sid), these problems will be fixed soon.

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