FreeBSD : xen-kernel -- Long latency populate-on-demand operation is not preemptible (83350009-881e-11e5-ab94-002590263bf5)

Medium Nessus Plugin ID 86838


The remote FreeBSD host is missing a security-related update.


The Xen Project reports :

When running an HVM domain in Populate-on-Demand mode, Xen would sometimes search the domain for memory to reclaim, in response to demands for population of other pages in the same domain. This search runs without preemption. The guest can, by suitable arrangement of its memory contents, create a situation where this search is a time-consuming linear scan of the guest's address space.

A malicious HVM guest administrator can cause a denial of service.
Specifically, prevent use of a physical CPU for a significant period.


Update the affected package.

See Also

Plugin Details

Severity: Medium

ID: 86838

File Name: freebsd_pkg_83350009881e11e5ab94002590263bf5.nasl

Version: $Revision: 2.1 $

Type: local

Published: 2015/11/11

Modified: 2015/11/11

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 4.9

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:N/A:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:xen-kernel, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Patch Publication Date: 2015/11/11

Vulnerability Publication Date: 2015/10/29

Reference Information

CVE: CVE-2015-7970