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CVE-2011-2519

Published: 27 December 2013

Xen in the Linux kernel, when running a guest on a host without hardware assisted paging (HAP), allows guest users to cause a denial of service (invalid pointer dereference and hypervisor crash) via the SAHF instruction.

From the Ubuntu security team

A flaw was found in the way the Linux kernel's Xen hypervisor implementation emulated the SAHF instruction. When using a fully-virtualized guest on a host that does not use hardware assisted paging (HAP), such as those running CPUs that do not have support for (or those that have it disabled) Intel Extended Page Tables (EPT) or AMD Virtualization (AMD-V) Rapid Virtualization Indexing (RVI), a privileged guest user could trigger this flaw to cause the hypervisor to crash.

Priority

Medium

Status

Package Release Status
xen
Launchpad, Ubuntu, Debian
hardy Does not exist

lucid Does not exist

maverick Does not exist

natty Does not exist

oneiric Not vulnerable
(4.1.1-2ubuntu4.3)
precise Not vulnerable
(4.1.2-2ubuntu2.3)
quantal Not vulnerable
(4.1.3-3ubuntu1.1)
raring Not vulnerable
(4.1.3-3ubuntu1)
upstream Needs triage

Patches:
upstream: http://xenbits.xen.org/hg/xen-3.1-testing.hg/rev/15644
Binaries built from this source package are in Universe and so are supported by the community.
xen-3.1
Launchpad, Ubuntu, Debian
hardy Ignored
(reached end-of-life)
lucid Does not exist

maverick Does not exist

natty Does not exist

oneiric Does not exist

precise Does not exist

quantal Does not exist

raring Does not exist

upstream Needs triage

Binaries built from this source package are in Universe and so are supported by the community.
xen-3.2
Launchpad, Ubuntu, Debian
hardy Ignored
(reached end-of-life)
lucid Does not exist

maverick Does not exist

natty Does not exist

oneiric Does not exist

precise Does not exist

quantal Does not exist

raring Does not exist

upstream Needs triage

Binaries built from this source package are in Universe and so are supported by the community.
xen-3.3
Launchpad, Ubuntu, Debian
hardy Does not exist

lucid Not vulnerable
(3.3.0-1ubuntu11)
maverick Ignored
(reached end-of-life)
natty Ignored
(reached end-of-life)
oneiric Does not exist

precise Does not exist

quantal Does not exist

raring Does not exist

upstream Needs triage

Binaries built from this source package are in Universe and so are supported by the community.