{"id":"CVE-2026-23555","aliases":["ALPINE-CVE-2026-23555","DEBIAN-CVE-2026-23555","EUVD-2026-14383","GHSA-hv7f-mhvh-6mf6","SUSE-SU-2026:0908-1","SUSE-SU-2026:1093-1","UBUNTU-CVE-2026-23555","openSUSE-SU-2026:10457-1"],"status":"published","title":"Xenstored DoS by unprivileged domain","description":"Any guest issuing a Xenstore command accessing a node using the\n(illegal) node path \"/local/domain/\", will crash xenstored due to a\nclobbered error indicator in xenstored when verifying the node path.\n\nNote that the crash is forced via a failing assert() statement in\nxenstored. In case xenstored is being built with NDEBUG #defined,\nan unprivileged guest trying to access the node path \"/local/domain/\"\nwill result in it no longer being serviced by xenstored, other guests\n(including dom0) will still be serviced, but xenstored will use up\nall cpu time it can get.","severity":{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00188,"percentile":0.08525,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-617"],"published":"2026-03-17T16:32:40Z","modified":"2026-10-17T12:58:07Z","fixes":[{"ecosystem":"Alpine:v3.20","package":"xen","fixed_in":["4.18.5-r5"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"xen","fixed_in":["4.19.4-r2"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"xen","fixed_in":["4.20.2-r2"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"xen","fixed_in":["4.20.2-r2"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"xen","fixed_in":["4.21.0-r3"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"xen","fixed_in":["4.20.3+127-gc42374a105-0+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"xen","fixed_in":["4.20.3+127-gc42374a105-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.20","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.0"},{"fixed":"4.18.5-r5"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.0"},{"fixed":"4.19.4-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.0"},{"fixed":"4.20.2-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.0"},{"fixed":"4.20.2-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.0"},{"fixed":"4.21.0-r3"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.3+127-gc42374a105-0+deb13u1"}]}],"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"]},{"source":"osv","ecosystem":"Debian:14","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.3+127-gc42374a105-1"}]}],"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"]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP6-LTSS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.5_12-150600.3.40.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP6","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.5_12-150600.3.40.1"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Leap 15.6","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.5_12-150600.3.40.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP7","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.2_08-150700.3.28.1"}]}],"bundled":2},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Server Applications 15 SP7","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.2_08-150700.3.28.1"}]}],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.1-0ubuntu1","4.5.1-0ubuntu2","4.6.0-1ubuntu1","4.6.0-1ubuntu2","4.6.0-1ubuntu4","4.6.0-1ubuntu4.1","4.6.0-1ubuntu4.2","4.6.0-1ubuntu4.3","4.6.5-0ubuntu1","4.6.5-0ubuntu1.1","4.6.5-0ubuntu1.2","4.6.5-0ubuntu1.4"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9.0-0ubuntu3","4.9.0-0ubuntu4","4.9.2-0ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9.2-0ubuntu2","4.9.2-0ubuntu6","4.9.2-0ubuntu7","4.11.3+24-g14b62ab3e5-1ubuntu1","4.11.3+24-g14b62ab3e5-1ubuntu2","4.11.3+24-g14b62ab3e5-1ubuntu2.2","4.11.3+24-g14b62ab3e5-1ubuntu2.3"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.4+24-gddaaccbbab-1ubuntu2","4.16.0-1~ubuntu2","4.16.0-1~ubuntu2.1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.17.2-1","4.17.2+55-g0b56bed864-1","4.17.2+76-ge1f9cb16e2-1","4.17.2+76-ge1f9cb16e2-1ubuntu1","4.17.3+10-g091466ba55-1","4.17.3+10-g091466ba55-1.1ubuntu2","4.17.3+10-g091466ba55-1.1ubuntu3"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.20.0-1ubuntu1","4.20.0+68-g35cb38b222-1"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.20.2+7-g1badcf5035-2build2","4.20.2+37-g61ff35323e-1ubuntu1","4.20.3+127-gc42374a105-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.20.0+68-g35cb38b222-1","4.20.2+7-g1badcf5035-2","4.20.2+7-g1badcf5035-2build2"]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.21.1_02-1.1"}]}],"bundled":2}],"products":[{"vendor":"xen","product":"xen"}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-481.html","tags":["Patch","Vendor Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/03/17/7","tags":["Mailing List","Patch","Third Party Advisory"]},{"url":"http://xenbits.xen.org/xsa/advisory-481.html","tags":["Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23555"},{"url":"https://github.com/advisories/GHSA-hv7f-mhvh-6mf6"},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-23555","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-23555","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20260908-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1259247","tags":["report"]},{"url":"https://bugzilla.suse.com/1259248","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-23554","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-23555","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261093-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-23555","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23555","tags":["report"]},{"url":"https://xenbits.xen.org/xsa/advisory-481.html","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-23555","title":"Xenstored DoS by unprivileged domain","description":"Any guest issuing a Xenstore command accessing a node using the\n(illegal) node path \"/local/domain/\", will crash xenstored due to a\nclobbered error indicator in xenstored when verifying the node path.\n\nNote that the crash is forced via a failing assert() statement in\nxenstored. In case xenstored is being built with NDEBUG #defined,\nan unprivileged guest trying to access the node path \"/local/domain/\"\nwill result in it no longer being serviced by xenstored, other guests\n(including dom0) will still be serviced, but xenstored will use up\nall cpu time it can get.","status":"published","published":"2026-03-23T06:57:07.653Z","modified":"2026-03-23T14:14:02.81Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T13:42:15.603999Z"}],"euvd":[{"id":"EUVD-2026-14383","description":"Any guest issuing a Xenstore command accessing a node using the\n(illegal) node path \"/local/domain/\", will crash xenstored due to a\nclobbered error indicator in xenstored when verifying the node path.\n\nNote that the crash is forced via a failing assert() statement in\nxenstored. In case xenstored is being built with NDEBUG #defined,\nan unprivileged guest trying to access the node path \"/local/domain/\"\nwill result in it no longer being serviced by xenstored, other guests\n(including dom0) will still be serviced, but xenstored will use up\nall cpu time it can get.","status":"published","published":"2026-03-23T06:57:07Z","modified":"2026-03-23T14:14:02Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T19:25:31.168902Z"}],"ghsa":[{"id":"GHSA-hv7f-mhvh-6mf6","title":"Any guest issuing a Xenstore command accessing a node using the\n(illegal) node path \"/local...","description":"Any guest issuing a Xenstore command accessing a node using the\n(illegal) node path \"/local/domain/\", will crash xenstored due to a\nclobbered error indicator in xenstored when verifying the node path.\n\nNote that the crash is forced via a failing assert() statement in\nxenstored. In case xenstored is being built with NDEBUG #defined,\nan unprivileged guest trying to access the node path \"/local/domain/\"\nwill result in it no longer being serviced by xenstored, other guests\n(including dom0) will still be serviced, but xenstored will use up\nall cpu time it can get.","status":"published","published":"2026-03-23T09:30:28Z","modified":"2026-03-23T15:30:44Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T15:06:47.740951Z"}],"nvd":[{"id":"CVE-2026-23555","description":"Any guest issuing a Xenstore command accessing a node using the\n(illegal) node path \"/local/domain/\", will crash xenstored due to a\nclobbered error indicator in xenstored when verifying the node path.\n\nNote that the crash is forced via a failing assert() statement in\nxenstored. In case xenstored is being built with NDEBUG #defined,\nan unprivileged guest trying to access the node path \"/local/domain/\"\nwill result in it no longer being serviced by xenstored, other guests\n(including dom0) will still be serviced, but xenstored will use up\nall cpu time it can get.","status":"published","published":"2026-03-23T07:16:07.33Z","modified":"2026-06-17T10:21:46.473Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"ALPINE-CVE-2026-23555","description":"Any guest issuing a Xenstore command accessing a node using the\n(illegal) node path \"/local/domain/\", will crash xenstored due to a\nclobbered error indicator in xenstored when verifying the node path.\n\nNote that the crash is forced via a failing assert() statement in\nxenstored. In case xenstored is being built with NDEBUG #defined,\nan unprivileged guest trying to access the node path \"/local/domain/\"\nwill result in it no longer being serviced by xenstored, other guests\n(including dom0) will still be serviced, but xenstored will use up\nall cpu time it can get.","status":"published","published":"2026-03-23T07:16:07.33Z","modified":"2026-10-01T02:17:49.211247836Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:50.269992Z"},{"id":"DEBIAN-CVE-2026-23555","description":"Any guest issuing a Xenstore command accessing a node using the (illegal) node path \"/local/domain/\", will crash xenstored due to a clobbered error indicator in xenstored when verifying the node path.  Note that the crash is forced via a failing assert() statement in xenstored. In case xenstored is being built with NDEBUG #defined, an unprivileged guest trying to access the node path \"/local/domain/\" will result in it no longer being serviced by xenstored, other guests (including dom0) will still be serviced, but xenstored will use up all cpu time it can get.","status":"published","published":"2026-03-23T07:16:07.33Z","modified":"2026-10-01T03:03:20.99034928Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:53.516942Z"},{"id":"UBUNTU-CVE-2026-23555","description":"Any guest issuing a Xenstore command accessing a node using the (illegal) node path \"/local/domain/\", will crash xenstored due to a clobbered error indicator in xenstored when verifying the node path. Note that the crash is forced via a failing assert() statement in xenstored. In case xenstored is being built with NDEBUG #defined, an unprivileged guest trying to access the node path \"/local/domain/\" will result in it no longer being serviced by xenstored, other guests (including dom0) will still be serviced, but xenstored will use up all cpu time it can get.","status":"published","published":"2026-03-23T07:16:00Z","modified":"2026-10-17T12:58:07.302328099Z","cvss":[{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"},{"version":"3.1","score":7.1,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:04.456047Z"},{"id":"openSUSE-SU-2026:10457-1","title":"xen-4.21.1_02-1.1 on GA media","description":"These are all security issues fixed in the xen-4.21.1_02-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-03-28T00:00:00Z","modified":"2026-03-29T10:46:05.328546Z","updated_at":"2026-11-02T16:58:38.415593Z"},{"id":"SUSE-SU-2026:0908-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2026-23554: xen: Use after free of paging structures in EPT (bsc#1259247, XSA-480)\n- CVE-2026-23555: xen: Xenstored DoS by unprivileged domain (bsc#1259248, XSA-481)\n","status":"published","published":"2026-03-17T16:32:40Z","modified":"2026-03-18T08:45:10.57726Z","updated_at":"2026-11-02T15:54:01.262144Z"},{"id":"SUSE-SU-2026:1093-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2026-23554: xen: Use after free of paging structures in EPT (bsc#1259247, XSA-480)\n- CVE-2026-23555: xen: Xenstored DoS by unprivileged domain (bsc#1259248, XSA-481)\n","status":"published","published":"2026-03-26T17:52:21Z","modified":"2026-03-28T08:45:28.760568Z","updated_at":"2026-11-02T15:54:01.262144Z"}]}}