Virtual interrupt injection could be triggered by a guest when sending
an SGI (e.g IPI) to any vCPU or by configuring timers. When the virtual
interrupt is masked, a missing check in the injection path may result in
reading invalid hardware register or crashing the host.
A guest may cause a hypervisor crash, resulting in a Denial of Service
All Xen versions which support ARM are affected.
x86 systems are not affected.
On systems where the guest kernel is controlled by the host rather than
guest administrator, running only kernels which do not disable SGI and
PPI (i.e IRQ < 32) will prevent untrusted guest users from exploiting
this issue. However untrusted guest administrators can still trigger it
unless further steps are taken to prevent them from loading code into
the kernel (e.g by disabling loadable modules etc) or from using other
mechanisms which allow them to run code at kernel privilege.
This issue was discovered by Julien Grall of ARM.
Applying the attached patch resolves this issue.
xsa223.patch xen-unstable, Xen 4.8.x, Xen 4.7.x, Xen 4.6.x, Xen 4.5.x
$ sha256sum xsa223*
DEPLOYMENT DURING EMBARGO
Deployment of the patches and/or mitigations described above (or
others which are substantially similar) is permitted during the
embargo, even on public-facing systems with untrusted guest users and
But: Distribution of updated software is prohibited (except to other
members of the predisclosure list).
Predisclosure list members who wish to deploy significantly different
patches and/or mitigations, please contact the Xen Project Security
(Note: this during-embargo deployment notice is retained in
post-embargo publicly released Xen Project advisories, even though it
is then no longer applicable. This is to enable the community to have
oversight of the Xen Project Security Team's decisionmaking.)
Author: Yixun Lan <email@example.com>
Date: Wed Jul 12 15:15:52 2017 +0800
app-emulation/xen: security bump
Package-Manager: Portage-2.3.6, Repoman-2.3.2
:100644 100644 6534404116c... 49df2654a33... M app-emulation/xen/Manifest
:000000 100644 00000000000... f66bd1b70f8... A app-emulation/xen/xen-4.7.3.ebuild
:000000 100644 00000000000... bf73951bc39... A app-emulation/xen/xen-4.8.1-r2.ebuild
Thank you Yixun Lan
Arches please let us know when all is stable
Re-Categorized since affects only arm.
Even though non stable is not in GLSA, including since we have a GLSA pending.
Maintainer(s), please drop the vulnerable version(s).