{"cve":"CVE-2016-3159","nvd":{"published":"2016-04-13T16:59:19.507","modified":"2026-06-17T00:45:12.563","status":"Modified","description":"The fpu_fxrstor function in arch/x86/i387.c in Xen 4.x does not properly handle writes to the hardware FSW.ES bit when running on AMD64 processors, which allows local guest OS users to obtain sensitive register content information from another guest by leveraging pending exception and mask bits.  NOTE: this vulnerability exists because of an incorrect fix for CVE-2013-2076.","cvss_v4":null,"cvss_v3":{"version":"3.0","vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N","score":3.8},"cwes":["CWE-200","CWE-284"],"references":["http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181699.html","http://lists.fedoraproject.org/pipermail/package-announce/2016-April/181729.html","http://support.citrix.com/article/CTX209443","http://www.debian.org/security/2016/dsa-3554","http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html"],"products":["debian:debian_linux","fedoraproject:fedora","oracle:vm_server","xen:xen"],"source":"nvd","synced_at":"2026-10-19T20:38:51.654415212+00:00"},"epss":{"cve":"CVE-2016-3159","score":0.00399,"percentile":0.34218,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}