{"id":"CVE-2014-9066","aliases":["DEBIAN-CVE-2014-9066","EUVD-2014-8892","GHSA-4f7c-f5r2-23hx","SUSE-SU-2015:0613-1","UBUNTU-CVE-2014-9066"],"status":"published","title":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and...","description":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.","severity":{"version":"2.0","score":4.7,"vector":"AV:L/AC:M/Au:N/C:N/I:N/A:C","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.00398,"percentile":0.34269,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-17"],"published":"2014-12-09T22:52:00Z","modified":"2026-10-23T15:47:29Z","fixes":[{"ecosystem":"Ubuntu:14.04:LTS","package":"xen","fixed_in":["4.4.1-0ubuntu0.14.04.4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.17.1+2-gb773c48e36-1","4.17.2+55-g0b56bed864-1","4.17.2+76-ge1f9cb16e2-1","4.17.2+76-ge1f9cb16e2-1~deb12u1","4.17.2-1","4.17.3+10-g091466ba55-1","4.17.3+10-g091466ba55-1.1","4.17.3+10-g091466ba55-1.1~exp1","4.17.3+10-g091466ba55-1.1~exp2","4.17.3+10-g091466ba55-1~deb12u1","4.17.3+36-g54dacb5c02-1","4.17.5+23-ga4e5191dc0-1","4.17.5+23-ga4e5191dc0-1+deb12u1","4.17.5+72-g01140da4e8-1","4.17.7-0+deb12u1","4.19.0+14-g0918434e0f-1~exp1","4.19.1-1","4.19.1-1~exp1","4.19.1-1~exp4","4.20.0+68-g35cb38b222-1","4.20.0-1","4.20.0~rc2+1-gfcde5e0de8-1~exp1","4.20.2+37-g61ff35323e-1","4.20.2+7-g1badcf5035-1","4.20.2+7-g1badcf5035-2","4.20.3+127-gc42374a105-1","4.20.4+39-gf1e1321c87-1"]},{"source":"osv","ecosystem":"Debian:13","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.20.0+68-g35cb38b222-1","4.20.2+37-g61ff35323e-0+deb13u1","4.20.2+37-g61ff35323e-1","4.20.2+7-g1badcf5035-0+deb13u1","4.20.2+7-g1badcf5035-1","4.20.2+7-g1badcf5035-2","4.20.3+127-gc42374a105-0+deb13u1","4.20.3+127-gc42374a105-1","4.20.4+39-gf1e1321c87-0+deb13u1","4.20.4+39-gf1e1321c87-1"]},{"source":"osv","ecosystem":"Debian:14","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.20.0+68-g35cb38b222-1","4.20.2+37-g61ff35323e-1","4.20.2+7-g1badcf5035-1","4.20.2+7-g1badcf5035-2","4.20.3+127-gc42374a105-1","4.20.4+39-gf1e1321c87-1"]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Desktop 12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.1_10-9.1"}]}],"bundled":8},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Software Development Kit 12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.1_10-9.1"}]}],"bundled":8},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.1_10-9.1"}]}],"bundled":8},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.1_10-9.1"}]}],"bundled":8},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.4.1-0ubuntu0.14.04.4"}]}],"versions":["4.3.0-1ubuntu1","4.3.0-1ubuntu2","4.3.0-1ubuntu3","4.3.0-1ubuntu4","4.3.0-1ubuntu5","4.4.0-0ubuntu3","4.4.0-0ubuntu4","4.4.0-0ubuntu5","4.4.0-0ubuntu5.1","4.4.0-0ubuntu5.2","4.4.1-0ubuntu0.14.04.1","4.4.1-0ubuntu0.14.04.2","4.4.1-0ubuntu0.14.04.3"]}],"products":[{"vendor":"opensuse","product":"opensuse"},{"vendor":"xen","product":"xen"}],"references":[{"url":"http://xenbits.xen.org/xsa/advisory-114.html","tags":["x_refsource_CONFIRM","x_transferred","Patch","Vendor Advisory","advisory","fix","report"]},{"url":"https://security.gentoo.org/glsa/201504-04","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","advisory"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00005.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","web"]},{"url":"http://www.securityfocus.com/bid/71546","tags":["vdb-entry","x_refsource_BID","x_transferred","web"]},{"url":"http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00010.html","tags":["vendor-advisory","x_refsource_SUSE","x_transferred","web"]},{"url":"http://www.openwall.com/lists/oss-security/2014/12/08/4","tags":["mailing-list","x_refsource_MLIST","x_transferred","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2014-9066"},{"url":"https://github.com/advisories/GHSA-4f7c-f5r2-23hx"},{"url":"https://security-tracker.debian.org/tracker/CVE-2014-9066","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2015/suse-su-20150613-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/861318","tags":["report"]},{"url":"https://bugzilla.suse.com/882089","tags":["report"]},{"url":"https://bugzilla.suse.com/895528","tags":["report"]},{"url":"https://bugzilla.suse.com/901488","tags":["report"]},{"url":"https://bugzilla.suse.com/903680","tags":["report"]},{"url":"https://bugzilla.suse.com/904255","tags":["report"]},{"url":"https://bugzilla.suse.com/906996","tags":["report"]},{"url":"https://bugzilla.suse.com/910254","tags":["report"]},{"url":"https://bugzilla.suse.com/910681","tags":["report"]},{"url":"https://bugzilla.suse.com/912011","tags":["report"]},{"url":"https://bugzilla.suse.com/918995","tags":["report"]},{"url":"https://bugzilla.suse.com/918998","tags":["report"]},{"url":"https://bugzilla.suse.com/919098","tags":["report"]},{"url":"https://bugzilla.suse.com/919464","tags":["report"]},{"url":"https://bugzilla.suse.com/919663","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2014-3615","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9065","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2014-9066","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-0361","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-2044","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-2045","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-2151","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-2152","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2014-9066","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2014-9066","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2014-9066","description":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.","status":"published","published":"2014-12-09T22:52:00Z","modified":"2024-08-06T13:33:13.484Z","updated_at":"2026-11-02T14:33:42.882687Z"}],"euvd":[{"id":"EUVD-2014-8892","description":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.","status":"published","published":"2014-12-09T22:52:00Z","modified":"2024-08-06T13:33:13Z","updated_at":"2026-11-03T01:56:50.141542Z"}],"ghsa":[{"id":"GHSA-4f7c-f5r2-23hx","title":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and...","description":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.","status":"published","published":"2022-05-14T02:05:55Z","modified":"2023-02-02T05:05:06Z","updated_at":"2026-11-02T14:52:01.503631Z"}],"nvd":[{"id":"CVE-2014-9066","description":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.","status":"published","published":"2014-12-09T23:59:09.193Z","modified":"2026-06-17T00:17:44.407Z","cvss":[{"version":"2.0","score":4.7,"vector":"AV:L/AC:M/Au:N/C:N/I:N/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-17"],"updated_at":"2026-11-02T14:02:57.680258Z"}],"osv":[{"id":"CVE-2014-9066","description":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.","status":"published","published":"2014-12-09T23:59:09Z","modified":"2026-04-10T03:44:47.679045Z","updated_at":"2026-11-02T15:44:00.097545Z"},{"id":"DEBIAN-CVE-2014-9066","description":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.","status":"published","published":"2014-12-09T23:59:09.193Z","modified":"2026-10-23T15:47:29.562162588Z","updated_at":"2026-11-02T15:45:26.442161Z"},{"id":"SUSE-SU-2015:0613-1","title":"Security update for Xen","description":"\nThe XEN hypervisor received updates to fix various security issues and bugs.\n\nThe following security issues were fixed:\n- CVE-2015-2151: XSA-123: A hypervisor memory corruption due to x86 emulator flaw.\n- CVE-2015-2045: XSA-122: Information leak through version information hypercall.\n- CVE-2015-2044: XSA-121: Information leak via internal x86 system device emulation.\n- CVE-2015-2152: XSA-119: HVM qemu was unexpectedly enabling emulated VGA graphics backends.\n- CVE-2014-3615: Information leakage when guest sets high graphics resolution.\n- CVE-2015-0361: XSA-116: A xen crash due to use after free on hvm guest teardown.\n- CVE-2014-9065, CVE-2014-9066: XSA-114: xen: p2m lock starvation.\n\nAlso the following bugs were fixed:\n- bnc#919098 - XEN blktap device intermittently fails to connect \n- bnc#882089 - Windows 2012 R2 fails to boot up with greater than 60 vcpus\n- bnc#903680 - Problems with detecting free loop devices on Xen guest startup\n- bnc#861318 - xentop reports 'Found interface vif101.0 but domain 101 does not exist.' \n- Update seabios to rel-1.7.3.1 which is the correct version for Xen 4.4\n- Enhancement to virsh/libvirtd 'send-key' command The xen side small fix. (FATE#317240)\n- bnc#901488 - Intel ixgbe driver assigns rx/tx queues per core\n  resulting in irq problems on servers with a large amount of CPU\n  cores\n- bnc#910254 - SLES11 SP3 Xen VT-d igb NIC doesn't work\n- Add domain_migrate_constraints_set API to Xend's http interface (FATE#317239)\n- Restore missing fixes from block-dmmd script\n- bnc#904255 - XEN boot hangs in early boot on UEFI system\n- bsc#912011 - high ping latency after upgrade to latest SLES11SP3 on xen Dom0\n- Fix missing banner by restoring the figlet program.\n","status":"published","published":"2015-03-09T18:38:17Z","modified":"2026-02-04T02:51:22.320535Z","updated_at":"2026-11-02T15:53:41.276824Z"},{"id":"UBUNTU-CVE-2014-9066","description":"Xen 4.4.x and earlier, when using a large number of VCPUs, does not properly handle read and write locks, which allows local x86 guest users to cause a denial of service (write denial or NMI watchdog timeout and host crash) via a large number of read requests, a different vulnerability than CVE-2014-9065.","status":"published","published":"2014-12-09T23:59:00Z","modified":"2026-04-22T09:53:55.653758Z","updated_at":"2026-11-02T15:54:09.378953Z"}]}}