{"id":"CVE-2016-9923","aliases":["DEBIAN-CVE-2016-9923","EUVD-2016-10710","GHSA-chcq-mx34-rm7h","UBUNTU-CVE-2016-9923"],"status":"published","title":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free...","description":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free issue. It could occur while hotplug and unplugging the device in the guest. A guest user/process could use this flaw to crash a Qemu process on the host resulting in DoS.","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-08","score":0.01261,"percentile":0.69827,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-416"],"published":"2016-12-23T22:00:00Z","modified":"2026-10-24T10:30:35Z","fixes":[{"ecosystem":"Debian:12","package":"qemu","fixed_in":["1:2.8+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"qemu","fixed_in":["1:2.8+dfsg-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"qemu","fixed_in":["1:2.8+dfsg-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.8+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.8+dfsg-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:2.8+dfsg-1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.5.0+dfsg-3ubuntu5","1.5.0+dfsg-3ubuntu6","1.6.0+dfsg-2ubuntu1","1.6.0+dfsg-2ubuntu2","1.6.0+dfsg-2ubuntu3","1.6.0+dfsg-2ubuntu4","1.7.0+dfsg-2ubuntu1","1.7.0+dfsg-2ubuntu2","1.7.0+dfsg-2ubuntu3","1.7.0+dfsg-2ubuntu4","1.7.0+dfsg-2ubuntu5","1.7.0+dfsg-2ubuntu7","1.7.0+dfsg-2ubuntu8","1.7.0+dfsg-2ubuntu9","1.7.0+dfsg-3ubuntu1~ppa1","1.7.0+dfsg-3ubuntu1","1.7.0+dfsg-3ubuntu2","1.7.0+dfsg-3ubuntu3","1.7.0+dfsg-3ubuntu4","1.7.0+dfsg-3ubuntu5","1.7.0+dfsg-3ubuntu6","1.7.0+dfsg-3ubuntu7","2.0.0~rc1+dfsg-0ubuntu1","2.0.0~rc1+dfsg-0ubuntu2","2.0.0~rc1+dfsg-0ubuntu3","2.0.0~rc1+dfsg-0ubuntu3.1","2.0.0+dfsg-2ubuntu1","2.0.0+dfsg-2ubuntu1.1","2.0.0+dfsg-2ubuntu1.2","2.0.0+dfsg-2ubuntu1.3","2.0.0+dfsg-2ubuntu1.5","2.0.0+dfsg-2ubuntu1.6","2.0.0+dfsg-2ubuntu1.7","2.0.0+dfsg-2ubuntu1.8","2.0.0+dfsg-2ubuntu1.9","2.0.0+dfsg-2ubuntu1.10","2.0.0+dfsg-2ubuntu1.11","2.0.0+dfsg-2ubuntu1.13","2.0.0+dfsg-2ubuntu1.14","2.0.0+dfsg-2ubuntu1.15","2.0.0+dfsg-2ubuntu1.16","2.0.0+dfsg-2ubuntu1.17","2.0.0+dfsg-2ubuntu1.18","2.0.0+dfsg-2ubuntu1.19","2.0.0+dfsg-2ubuntu1.20","2.0.0+dfsg-2ubuntu1.21","2.0.0+dfsg-2ubuntu1.22","2.0.0+dfsg-2ubuntu1.24","2.0.0+dfsg-2ubuntu1.25","2.0.0+dfsg-2ubuntu1.26","2.0.0+dfsg-2ubuntu1.27","2.0.0+dfsg-2ubuntu1.28","2.0.0+dfsg-2ubuntu1.29","2.0.0+dfsg-2ubuntu1.30","2.0.0+dfsg-2ubuntu1.31","2.0.0+dfsg-2ubuntu1.32","2.0.0+dfsg-2ubuntu1.33","2.0.0+dfsg-2ubuntu1.34","2.0.0+dfsg-2ubuntu1.35","2.0.0+dfsg-2ubuntu1.36","2.0.0+dfsg-2ubuntu1.38","2.0.0+dfsg-2ubuntu1.39","2.0.0+dfsg-2ubuntu1.40","2.0.0+dfsg-2ubuntu1.41","2.0.0+dfsg-2ubuntu1.42","2.0.0+dfsg-2ubuntu1.43","2.0.0+dfsg-2ubuntu1.44","2.0.0+dfsg-2ubuntu1.45","2.0.0+dfsg-2ubuntu1.46","2.0.0+dfsg-2ubuntu1.47","2.0.0+dfsg-2ubuntu1.47+esm1","2.0.0+dfsg-2ubuntu1.47+esm2","2.0.0+dfsg-2ubuntu1.47+esm3","2.0.0+dfsg-2ubuntu1.47+esm4","2.0.0+dfsg-2ubuntu1.47+esm6"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"qemu","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:2.3+dfsg-5ubuntu9","1:2.3+dfsg-5ubuntu10","1:2.4+dfsg-4ubuntu1","1:2.4+dfsg-4ubuntu2","1:2.4+dfsg-4ubuntu3","1:2.4+dfsg-5ubuntu3","1:2.5+dfsg-1ubuntu2","1:2.5+dfsg-1ubuntu3","1:2.5+dfsg-1ubuntu4","1:2.5+dfsg-1ubuntu5","1:2.5+dfsg-5ubuntu1","1:2.5+dfsg-5ubuntu2","1:2.5+dfsg-5ubuntu4","1:2.5+dfsg-5ubuntu6","1:2.5+dfsg-5ubuntu7","1:2.5+dfsg-5ubuntu10","1:2.5+dfsg-5ubuntu10.1","1:2.5+dfsg-5ubuntu10.2","1:2.5+dfsg-5ubuntu10.3","1:2.5+dfsg-5ubuntu10.4","1:2.5+dfsg-5ubuntu10.5","1:2.5+dfsg-5ubuntu10.6","1:2.5+dfsg-5ubuntu10.7","1:2.5+dfsg-5ubuntu10.8","1:2.5+dfsg-5ubuntu10.9","1:2.5+dfsg-5ubuntu10.10","1:2.5+dfsg-5ubuntu10.11","1:2.5+dfsg-5ubuntu10.13","1:2.5+dfsg-5ubuntu10.14","1:2.5+dfsg-5ubuntu10.15","1:2.5+dfsg-5ubuntu10.16","1:2.5+dfsg-5ubuntu10.20","1:2.5+dfsg-5ubuntu10.21","1:2.5+dfsg-5ubuntu10.22","1:2.5+dfsg-5ubuntu10.24","1:2.5+dfsg-5ubuntu10.25","1:2.5+dfsg-5ubuntu10.26","1:2.5+dfsg-5ubuntu10.28","1:2.5+dfsg-5ubuntu10.29","1:2.5+dfsg-5ubuntu10.30","1:2.5+dfsg-5ubuntu10.31","1:2.5+dfsg-5ubuntu10.32","1:2.5+dfsg-5ubuntu10.33","1:2.5+dfsg-5ubuntu10.34","1:2.5+dfsg-5ubuntu10.35","1:2.5+dfsg-5ubuntu10.36","1:2.5+dfsg-5ubuntu10.37","1:2.5+dfsg-5ubuntu10.38","1:2.5+dfsg-5ubuntu10.39","1:2.5+dfsg-5ubuntu10.40","1:2.5+dfsg-5ubuntu10.41","1:2.5+dfsg-5ubuntu10.42","1:2.5+dfsg-5ubuntu10.43","1:2.5+dfsg-5ubuntu10.44","1:2.5+dfsg-5ubuntu10.45","1:2.5+dfsg-5ubuntu10.46","1:2.5+dfsg-5ubuntu10.47","1:2.5+dfsg-5ubuntu10.48","1:2.5+dfsg-5ubuntu10.49","1:2.5+dfsg-5ubuntu10.51","1:2.5+dfsg-5ubuntu10.51+esm1","1:2.5+dfsg-5ubuntu10.51+esm2","1:2.5+dfsg-5ubuntu10.51+esm3","1:2.5+dfsg-5ubuntu10.51+esm4"]}],"products":[{"vendor":"qemu","product":"qemu"}],"references":[{"url":"http://www.openwall.com/lists/oss-security/2016/12/09/2","tags":["mailing-list","x_refsource_MLIST","x_transferred","Mailing List","Patch","Third Party Advisory","fix"]},{"url":"https://security.gentoo.org/glsa/201701-49","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"http://www.securityfocus.com/bid/94827","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2016-9923"},{"url":"https://github.com/advisories/GHSA-chcq-mx34-rm7h"},{"url":"https://security-tracker.debian.org/tracker/CVE-2016-9923","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2016-9923","tags":["report"]},{"url":"https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg05597.html","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2016-9923","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2016-9923","description":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free issue. It could occur while hotplug and unplugging the device in the guest. A guest user/process could use this flaw to crash a Qemu process on the host resulting in DoS.","status":"published","published":"2016-12-23T22:00:00Z","modified":"2024-08-06T03:07:31.921Z","updated_at":"2026-11-02T14:33:32.103757Z"}],"euvd":[{"id":"EUVD-2016-10710","description":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free issue. It could occur while hotplug and unplugging the device in the guest. A guest user/process could use this flaw to crash a Qemu process on the host resulting in DoS.","status":"published","published":"2016-12-23T22:00:00Z","modified":"2024-08-06T03:07:31Z","updated_at":"2026-11-03T02:22:25.833438Z"}],"ghsa":[{"id":"GHSA-chcq-mx34-rm7h","title":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free...","description":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free issue. It could occur while hotplug and unplugging the device in the guest. A guest user/process could use this flaw to crash a Qemu process on the host resulting in DoS.","status":"published","published":"2022-05-13T01:12:19Z","modified":"2023-02-01T05:03:57Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:50:07.322817Z"}],"nvd":[{"id":"CVE-2016-9923","description":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free issue. It could occur while hotplug and unplugging the device in the guest. A guest user/process could use this flaw to crash a Qemu process on the host resulting in DoS.","status":"published","published":"2016-12-23T22:59:00.58Z","modified":"2026-06-17T00:56:47.54Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:P","level":"low","assessor":"primary"}],"cwes":["CWE-416"],"updated_at":"2026-11-02T14:03:33.686843Z"}],"osv":[{"id":"CVE-2016-9923","description":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free issue. It could occur while hotplug and unplugging the device in the guest. A guest user/process could use this flaw to crash a Qemu process on the host resulting in DoS.","status":"published","published":"2016-12-23T22:59:00.58Z","modified":"2026-10-24T10:30:35.281783048Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:03.472693Z"},{"id":"DEBIAN-CVE-2016-9923","description":"Quick Emulator (Qemu) built with the 'chardev' backend support is vulnerable to a use after free issue. It could occur while hotplug and unplugging the device in the guest. 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A guest user/process could use this flaw to crash a Qemu process on the host resulting in DoS.","status":"published","published":"2016-12-23T22:59:00Z","modified":"2026-06-09T21:15:34.053529744Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.0","score":6.5,"vector":"CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:54:13.356796Z"}]}}