Improper Input Validation Affecting xen package, versions <4.6.0-1ubuntu4.2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1604-XEN-367619
- published2 Aug 2016
- disclosed2 Aug 2016
Introduced: 2 Aug 2016
CVE-2016-6259 (opens in a new tab)How to fix?
Upgrade Ubuntu:16.04 xen to version 4.6.0-1ubuntu4.2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Ubuntu.
See How to fix? for Ubuntu:16.04 relevant fixed versions and status.
Xen 4.5.x through 4.7.x do not implement Supervisor Mode Access Prevention (SMAP) whitelisting in 32-bit exception and event delivery, which allows local 32-bit PV guest OS kernels to cause a denial of service (hypervisor and VM crash) by triggering a safety check.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-6259
- https://security-tracker.debian.org/tracker/CVE-2016-6259
- http://support.citrix.com/article/CTX214954
- http://xenbits.xen.org/xsa/advisory-183.html
- http://xenbits.xen.org/xsa/xsa183-4.6.patch
- http://xenbits.xen.org/xsa/xsa183-unstable.patch
- http://www.securityfocus.com/bid/92130
- http://www.securitytracker.com/id/1036447