{"id":"CVE-2020-29566","aliases":["ALPINE-CVE-2020-29566","DEBIAN-CVE-2020-29566","DSA-4812-1","EUVD-2020-21928","GHSA-mr64-xwwr-mx4c","SUSE-SU-2020:14578-1","SUSE-SU-2020:3880-1","SUSE-SU-2020:3881-1","SUSE-SU-2020:3913-1","SUSE-SU-2020:3914-1","SUSE-SU-2020:3915-1","SUSE-SU-2020:3916-1","SUSE-SU-2020:3945-1","UBUNTU-CVE-2020-29566","openSUSE-SU-2020:2313-1","openSUSE-SU-2020:2331-1","openSUSE-SU-2024:11520-1"],"status":"published","title":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model...","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","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":"2026-11-11","score":0.00444,"percentile":0.39018,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-674"],"published":"2020-12-15T00:00:00Z","modified":"2026-10-26T12:02:43Z","fixes":[{"ecosystem":"Alpine:v3.11","package":"xen","fixed_in":["4.13.2-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.12","package":"xen","fixed_in":["4.13.2-r3"],"sources":["osv"]},{"ecosystem":"Alpine:v3.13","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.14","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.15","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.16","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"xen","fixed_in":["4.14.1-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"xen","fixed_in":["4.14.0+88-g1d1d1f5391-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"xen","fixed_in":["4.14.0+88-g1d1d1f5391-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"xen","fixed_in":["4.14.0+88-g1d1d1f5391-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.11","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.13.2-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.13.2-r3"}]}]},{"source":"osv","ecosystem":"Alpine:v3.13","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.14","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.15","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.16","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.1-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.0+88-g1d1d1f5391-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.0+88-g1d1d1f5391-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.14.0+88-g1d1d1f5391-1"}]}]},{"source":"osv","ecosystem":"Debian:10","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.11.4+57-g41a822c392-2"}]}],"versions":["4.11.1+92-g6c33308a8d-2","4.11.3+24-g14b62ab3e5-1","4.11.3+24-g14b62ab3e5-1~deb10u1","4.11.4+24-gddaaccbbab-1","4.11.4+24-gddaaccbbab-1~deb10u1","4.11.4+37-g3263f257ca-1","4.11.4+57-g41a822c392-1","4.11.4-1"],"bundled":11},{"source":"osv","ecosystem":"SUSE:Linux 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Advisory","advisory"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred","web"]},{"url":"https://security.gentoo.org/glsa/202107-30","tags":["vendor-advisory","x_refsource_GENTOO","x_transferred","Third Party Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-29566"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/"},{"url":"https://github.com/advisories/GHSA-mr64-xwwr-mx4c"},{"url":"https://security.alpinelinux.org/vuln/CVE-2020-29566","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2020-29566","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-202014578-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1179477","tags":["report"]},{"url":"https://bugzilla.suse.com/1179496","tags":["report"]},{"url":"https://bugzilla.suse.com/1179498","tags":["report"]},{"url":"https://bugzilla.suse.com/1179501","tags":["report"]},{"url":"https://bugzilla.suse.com/1179502","tags":["report"]},{"url":"https://bugzilla.suse.com/1179506","tags":["report"]},{"url":"https://bugzilla.suse.com/1179514","tags":["report"]},{"url":"https://bugzilla.suse.com/1179516","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29130","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29480","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29481","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29483","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29484","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29566","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29570","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29571","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20203880-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1027519","tags":["report"]},{"url":"https://bugzilla.suse.com/1163019","tags":["report"]},{"url":"https://bugzilla.suse.com/1176782","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2020-8608","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20203881-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20203913-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20203914-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20203915-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20203916-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2020/suse-su-20203945-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2020-29566","tags":["report"]},{"url":"https://xenbits.xen.org/xsa/advisory-348.html","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2020-29566","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/ORUQM2NUGI7GTGQ4QQYAXYCCBGXOCR55/","tags":["advisory"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/KLZB3TTBVYNCRCZSSEYYBTXS7RCM6NL7/","tags":["advisory"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2007-1320","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2007-1366","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2007-3919","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-10013","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-10024","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-10025","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7777","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7908","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-7909","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8667","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8669","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-8910","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9377","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9379","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9381","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9382","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9383","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9384","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9385","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9386","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9637","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9921","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2016-9932","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-12135","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-12136","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-12137","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-2615","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-2620","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-5753","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-6505","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-8309","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2017-9330","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-10471","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-10472","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-10981","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-10982","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12126","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12891","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12892","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-12893","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-15468","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-15469","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-15470","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-18883","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19961","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19963","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19964","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19965","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19966","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-19967","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-3639","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-3646","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-3665","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-5244","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-7540","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-7541","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-7542","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2018-8897","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2019-17349","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-0543","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11739","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11740","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11742","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-11743","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15563","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15565","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15566","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-15567","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25595","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25596","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25597","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25598","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25599","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25600","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25601","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25602","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25603","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-25604","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-27670","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-27671","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-27672","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-27674","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-28368","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29040","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-29567","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-28687","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2020-29566","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","status":"published","published":"2020-12-15T16:49:11Z","modified":"2024-08-04T16:55:10.45Z","updated_at":"2026-11-02T14:35:55.460269Z"}],"euvd":[{"id":"EUVD-2020-21928","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","status":"published","published":"2020-12-15T16:49:11Z","modified":"2024-08-04T16:55:10Z","updated_at":"2026-11-03T03:07:07.463834Z"}],"ghsa":[{"id":"GHSA-mr64-xwwr-mx4c","title":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model...","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","status":"published","published":"2022-05-24T17:36:34Z","modified":"2023-01-29T05:05:05Z","cwes":["CWE-674"],"updated_at":"2026-11-02T14:45:42.563524Z"}],"nvd":[{"id":"CVE-2020-29566","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","status":"published","published":"2020-12-15T17:15:14.55Z","modified":"2026-06-17T03:11:26.583Z","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":4.9,"vector":"AV:L/AC:L/Au:N/C:N/I:N/A:C","level":"medium","assessor":"primary"}],"cwes":["CWE-674"],"updated_at":"2026-11-02T14:06:27.73474Z"}],"osv":[{"id":"ALPINE-CVE-2020-29566","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","status":"published","published":"2020-12-15T17:15:14.55Z","modified":"2026-10-26T11:17:55.169438903Z","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":"2026-11-02T15:27:48.11886Z"},{"id":"CVE-2020-29566","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","status":"published","published":"2020-12-15T17:15:14.55Z","modified":"2026-03-14T14:47:05.504806Z","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":"2026-11-02T15:44:16.612899Z"},{"id":"DEBIAN-CVE-2020-29566","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","status":"published","published":"2020-12-15T17:15:14.55Z","modified":"2026-10-26T12:02:43.449143655Z","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":"2026-11-02T15:45:34.019707Z"},{"id":"UBUNTU-CVE-2020-29566","description":"An issue was discovered in Xen through 4.14.x. When they require assistance from the device model, x86 HVM guests must be temporarily de-scheduled. The device model will signal Xen when it has completed its operation, via an event channel, so that the relevant vCPU is rescheduled. If the device model were to signal Xen without having actually completed the operation, the de-schedule / re-schedule cycle would repeat. If, in addition, Xen is resignalled very quickly, the re-schedule may occur before the de-schedule was fully complete, triggering a shortcut. This potentially repeating process uses ordinary recursive function calls, and thus could result in a stack overflow. A malicious or buggy stubdomain serving a HVM guest can cause Xen to crash, resulting in a Denial of Service (DoS) to the entire host. Only x86 systems are affected. Arm systems are not affected. Only x86 stubdomains serving HVM guests can exploit the vulnerability.","status":"published","published":"2020-12-15T17:15:00Z","modified":"2026-04-22T12:39:57.274975Z","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":"2026-11-02T15:54:24.541803Z"},{"id":"DSA-4812-1","title":"xen - security update","status":"published","published":"2020-12-15T00:00:00Z","modified":"2026-03-09T02:11:08.819507Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"openSUSE-SU-2020:2313-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n\nThis update was imported from the SUSE:SLE-15-SP1:Update update project.","status":"published","published":"2020-12-22T05:22:46Z","modified":"2025-05-07T18:12:04.496935Z","updated_at":"2026-11-02T16:58:31.517538Z"},{"id":"openSUSE-SU-2020:2331-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n\nThis update was imported from the SUSE:SLE-15-SP2:Update update project.","status":"published","published":"2020-12-26T05:22:25Z","modified":"2026-02-04T03:38:08.826583Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"id":"openSUSE-SU-2024:11520-1","title":"xen-4.15.1_01-1.2 on GA media","description":"These are all security issues fixed in the xen-4.15.1_01-1.2 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2025-05-07T18:08:22.378535Z","updated_at":"2026-11-02T16:58:35.195147Z"},{"id":"SUSE-SU-2020:14578-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- CVE-2020-29130: Fixed an out-of-bounds access while processing ARP packets (bsc#1179477). \n","status":"published","published":"2020-12-16T16:52:35Z","modified":"2026-02-04T03:40:59.864471Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"SUSE-SU-2020:3880-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- CVE-2020-29130: Fixed an out-of-bounds access while processing ARP packets (bsc#1179477). \n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n","status":"published","published":"2020-12-18T15:47:02Z","modified":"2026-02-04T04:36:31.987762Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2020:3881-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n","status":"published","published":"2020-12-18T15:47:14Z","modified":"2026-02-04T03:39:37.252654Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2020:3913-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- CVE-2020-29130: Fixed an out-of-bounds access while processing ARP packets (bsc#1179477). \n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n","status":"published","published":"2020-12-22T13:16:01Z","modified":"2026-02-04T03:59:34.976076Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2020:3914-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- CVE-2020-29130: Fixed an out-of-bounds access while processing ARP packets (bsc#1179477). \n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n","status":"published","published":"2020-12-22T13:16:20Z","modified":"2026-02-04T02:25:51.054779Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2020:3915-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n","status":"published","published":"2020-12-22T13:16:30Z","modified":"2026-02-04T02:49:46.962806Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2020:3916-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n","status":"published","published":"2020-12-22T13:16:42Z","modified":"2026-02-04T03:24:53.042108Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2020:3945-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2020-29480: Fixed an issue which could have allowed leak of non-sensitive data to administrator guests (bsc#117949 XSA-115).\n- CVE-2020-29481: Fixed an issue which could have allowd to new domains to inherit existing node permissions (bsc#1179498 XSA-322). \n- CVE-2020-29483: Fixed an issue where guests could disturb domain cleanup (bsc#1179502 XSA-325).\n- CVE-2020-29484: Fixed an issue where guests could crash xenstored via watchs (bsc#1179501 XSA-324). \n- CVE-2020-29566: Fixed an undue recursion in x86 HVM context switch code (bsc#1179506 XSA-348).\n- CVE-2020-29570: Fixed an issue where FIFO event channels control block related ordering (bsc#1179514 XSA-358).\n- CVE-2020-29571: Fixed an issue where FIFO event channels control structure ordering (bsc#1179516 XSA-359).\n- CVE-2020-29130: Fixed an out-of-bounds access while processing ARP packets (bsc#1179477). \n- Fixed an issue where dump-core shows missing nr_pages during core (bsc#1176782).\n- Multiple other bugs (bsc#1027519)\n","status":"published","published":"2020-12-29T12:09:29Z","modified":"2026-02-04T02:51:22.921364Z","updated_at":"2026-11-02T15:53:48.690034Z"}]}}