Race Condition Affecting xen package, versions <4.8.0~rc3-1
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-DEBIAN11-XEN-519045
- published7 Oct 2016
- disclosed7 Oct 2016
Introduced: 7 Oct 2016
CVE-2016-7777 (opens in a new tab)How to fix?
Upgrade Debian:11 xen to version 4.8.0~rc3-1 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 Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
Xen 4.7.x and earlier does not properly honor CR0.TS and CR0.EM, which allows local x86 HVM guest OS users to read or modify FPU, MMX, or XMM register state information belonging to arbitrary tasks on the guest by modifying an instruction while the hypervisor is preparing to emulate it.
References
- https://security-tracker.debian.org/tracker/CVE-2016-7777
- https://security.gentoo.org/glsa/201611-09
- https://support.citrix.com/article/CTX217363
- http://xenbits.xen.org/xsa/advisory-190.html
- http://www.securityfocus.com/bid/93344
- http://www.securitytracker.com/id/1036942
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2016-7777