{"schemaVersion":3,"id":"CVE-2016-7154","aliases":["UBUNTU-CVE-2016-7154","DEBIAN-CVE-2016-7154"],"status":"published","duplicateOf":null,"title":null,"description":"Use-after-free vulnerability in the FIFO event channel code in Xen 4.4.x allows local guest OS administrators to cause a denial of service (host crash) and possibly execute arbitrary code or obtain sensitive information via an invalid guest frame number.","dates":{"published":"2016-09-21T14:00:00.000Z","modified":"2024-08-06T01:50:47.467Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.2,"severity":"high","version":"2.0","versionLabel":"v2.0","source":"NVD","vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.0","versionLabel":"v3.0","source":"NVD","score":6.7,"severity":"medium","vector":"CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.2,"severity":"high","vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","exploitability":null,"impact":null,"computed":false},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Ubuntu","score":6.7,"severity":"medium","vector":"CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","exploitability":2.1,"impact":9.8,"computed":true},{"version":"3.0","versionLabel":"v3.0","source":"OSV · Debian","score":6.7,"severity":"medium","vector":"CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","exploitability":2.1,"impact":9.8,"computed":true}]},"epss":{"probability":0.00502,"percentile":0.42072,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00502},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00503,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00502,"percentile":0.42072}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00502,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00502,"percentile":0.42072}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-416","name":"Use After Free","description":"The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory \"belongs\" to the code that operates on the new pointer.","type":"weakness","status":"Stable","abstraction":"Variant","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/416.html"}],"affected":[{"vendor":"debian","product":"xen","name":"xen","label":"xen","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/xen","purlType":"deb","versions":[{"text":"< 4.6.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.6.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xen","name":"xen","label":"xen","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xen","purlType":"deb","versions":[{"text":"< 4.4.2-0ubuntu0.14.04.7","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 4.4.2-0ubuntu0.14.04.7","eol":null,"hubHref":null},{"vendor":"xen","product":"xen","name":"Xen","label":"xen","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"4.4.0","noFixRecorded":false,"fixedIn":null},{"text":"4.4.1","noFixRecorded":false,"fixedIn":null},{"text":"4.4.2","noFixRecorded":false,"fixedIn":null},{"text":"4.4.3","noFixRecorded":false,"fixedIn":null},{"text":"4.4.4","noFixRecorded":false,"fixedIn":null}],"versionsText":"4.4.0 | 4.4.1 | 4.4.2 | 4.4.3 | 4.4.4","eol":null,"hubHref":"/vendor/xen/xen"}],"affectedCount":3,"eol":{"hasEol":false,"count":0},"references":[{"url":"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html","label":"www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html","hostname":"www.oracle.com","tags":["X Refsource CONFIRM"]},{"url":"http://www.securityfocus.com/bid/92863","label":"www.securityfocus.com/bid/92863","hostname":"www.securityfocus.com","tags":["VDB Entry","X Refsource BID","Third Party Advisory"]},{"url":"http://xenbits.xen.org/xsa/advisory-188.html","label":"xenbits.xen.org/xsa/advisory-188.html","hostname":"xenbits.xen.org","tags":["X Refsource CONFIRM","Patch","Vendor Advisory","REPORT"]},{"url":"http://www.debian.org/security/2016/dsa-3663","label":"www.debian.org/security/2016/dsa-3663","hostname":"www.debian.org","tags":["Vendor Advisory","X Refsource DEBIAN"]},{"url":"http://xenbits.xen.org/xsa/xsa188.patch","label":"xenbits.xen.org/xsa/xsa188.patch","hostname":"xenbits.xen.org","tags":["X Refsource CONFIRM","Patch"]},{"url":"http://www.c7zero.info/stuff/csw2017_ExploringYourSystemDeeper_updated.pdf","label":"www.c7zero.info/stuff/csw2017_ExploringYourSystemDeeper_updated.pdf","hostname":"www.c7zero.info","tags":["X Refsource MISC"]},{"url":"http://support.citrix.com/article/CTX216071","label":"support.citrix.com/article/CTX216071","hostname":"support.citrix.com","tags":["X Refsource CONFIRM","Third Party Advisory"]},{"url":"http://www.securitytracker.com/id/1036754","label":"www.securitytracker.com/id/1036754","hostname":"www.securitytracker.com","tags":["VDB Entry","X Refsource SECTRACK","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2016-7154","label":"ubuntu.com/security/CVE-2016-7154","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-7154","label":"www.cve.org/CVERecord?id=CVE-2016-7154","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-7154","label":"security-tracker.debian.org/tracker/CVE-2016-7154","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DSA-3663-1","SUSE-SU-2016:2507-1","SUSE-SU-2016:2533-1"],"duplicates":[],"related":["SUSE-SU-2016:2507-1","SUSE-SU-2016:2533-1"]},"timeline":[{"kind":"published","date":"2016-09-21T14:00:00.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-06T01:50:47.467Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":29,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T18:56:13.916Z","stale":false,"partial":false}}