Vulnerability in Xen
CVE-2016-7777
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- support.citrix.com/article/CTX217363
- xenbits.xen.org/xsa/advisory-190.html (Patch, Mitigation, Vendor Advisory)
- www.securityfocus.com/bid/93344 (VDB Entry, Third Party Advisory, vdb-entry)
- security.gentoo.org/glsa/201611-09 (vendor-advisory)
- www.securitytracker.com/id/1036942 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2016-7777?
- CVE-2016-7777 is a medium-severity vulnerability in Xen, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 6.3/10. Published 2016-10-07.
- How severe is CVE-2016-7777?
- Medium severity. CVSS v3 base score is 6.3 out of 10.