{"id":"CVE-2026-23554","aliases":["ALPINE-CVE-2026-23554","DEBIAN-CVE-2026-23554","EUVD-2026-14382","GHSA-h6vw-38xq-3xwx","MGASA-2026-0068","SUSE-SU-2026:0908-1","SUSE-SU-2026:1092-1","SUSE-SU-2026:1093-1","UBUNTU-CVE-2026-23554","openSUSE-SU-2026:10457-1"],"status":"published","title":"Use after free of paging structures in EPT","description":"The Intel EPT paging code uses an optimization to defer flushing of any cached\nEPT state until the p2m lock is dropped, so that multiple modifications done\nunder the same locked region only issue a single flush.\n\nFreeing of paging structures however is not deferred until the flushing is\ndone, and can result in freed pages transiently being present in cached state.\nSuch stale entries can point to memory ranges not owned by the guest, thus\nallowing access to unintended memory regions.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-09","score":0.00133,"percentile":0.02848,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-367"],"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:12","package":"xen","fixed_in":["4.17.7-0+deb12u1"],"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"]},{"ecosystem":"Mageia:9","package":"xen","fixed_in":["4.17.5-1.git20251028.3.mga9"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Micro 5.5","package":"xen","fixed_in":["4.17.6_06-150500.3.62.2"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","package":"xen","fixed_in":["4.17.6_06-150500.3.62.2"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","package":"xen","fixed_in":["4.17.6_06-150500.3.62.2"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","package":"xen","fixed_in":["4.17.6_06-150500.3.62.2"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","package":"xen","fixed_in":["4.17.6_06-150500.3.62.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.20","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.17"},{"fixed":"4.18.5-r5"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.17"},{"fixed":"4.19.4-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.17"},{"fixed":"4.20.2-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.17"},{"fixed":"4.20.2-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.17"},{"fixed":"4.21.0-r3"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.7-0+deb12u1"}]}],"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"]},{"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":"Mageia:9","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.5-1.git20251028.3.mga9"}]}]},{"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 Micro 5.5","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.6_06-150500.3.62.2"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.6_06-150500.3.62.2"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.6_06-150500.3.62.2"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 15 SP5-LTSS","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.6_06-150500.3.62.2"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 15 SP5","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.6_06-150500.3.62.2"}]}]},{"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-480.html","tags":["Patch","Vendor Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2026/03/17/6","tags":["Mailing List","Patch","Third Party Advisory"]},{"url":"http://xenbits.xen.org/xsa/advisory-480.html","tags":["Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23554"},{"url":"https://github.com/advisories/GHSA-h6vw-38xq-3xwx"},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-23554","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-23554","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0068.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35222","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2026/03/17/6","tags":["web"]},{"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-20261092-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20261093-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-23554","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-23554","tags":["report"]},{"url":"https://xenbits.xen.org/xsa/advisory-480.html","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-23554","title":"Use after free of paging structures in EPT","description":"The Intel EPT paging code uses an optimization to defer flushing of any cached\nEPT state until the p2m lock is dropped, so that multiple modifications done\nunder the same locked region only issue a single flush.\n\nFreeing of paging structures however is not deferred until the flushing is\ndone, and can result in freed pages transiently being present in cached state.\nSuch stale entries can point to memory ranges not owned by the guest, thus\nallowing access to unintended memory regions.","status":"published","published":"2026-03-23T06:56:52.344Z","modified":"2026-03-23T14:19:27.752Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T13:42:15.603999Z"}],"euvd":[{"id":"EUVD-2026-14382","description":"The Intel EPT paging code uses an optimization to defer flushing of any cached\nEPT state until the p2m lock is dropped, so that multiple modifications done\nunder the same locked region only issue a single flush.\n\nFreeing of paging structures however is not deferred until the flushing is\ndone, and can result in freed pages transiently being present in cached state.\nSuch stale entries can point to memory ranges not owned by the guest, thus\nallowing access to unintended memory regions.","status":"published","published":"2026-03-23T06:56:52Z","modified":"2026-03-23T14:19:27Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T19:25:31.168902Z"}],"ghsa":[{"id":"GHSA-h6vw-38xq-3xwx","title":"The Intel EPT paging code uses an optimization to defer flushing of any cached\nEPT state until...","description":"The Intel EPT paging code uses an optimization to defer flushing of any cached\nEPT state until the p2m lock is dropped, so that multiple modifications done\nunder the same locked region only issue a single flush.\n\nFreeing of paging structures however is not deferred until the flushing is\ndone, and can result in freed pages transiently being present in cached state.\nSuch stale entries can point to memory ranges not owned by the guest, thus\nallowing access to unintended memory regions.","status":"published","published":"2026-03-23T09:30:28Z","modified":"2026-03-23T15:30:44Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T15:06:47.740951Z"}],"nvd":[{"id":"CVE-2026-23554","description":"The Intel EPT paging code uses an optimization to defer flushing of any cached\nEPT state until the p2m lock is dropped, so that multiple modifications done\nunder the same locked region only issue a single flush.\n\nFreeing of paging structures however is not deferred until the flushing is\ndone, and can result in freed pages transiently being present in cached state.\nSuch stale entries can point to memory ranges not owned by the guest, thus\nallowing access to unintended memory regions.","status":"published","published":"2026-03-23T07:16:07.2Z","modified":"2026-06-17T10:21:46.33Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-367"],"updated_at":"2026-11-02T14:12:10.568062Z"}],"osv":[{"id":"ALPINE-CVE-2026-23554","description":"The Intel EPT paging code uses an optimization to defer flushing of any cached\nEPT state until the p2m lock is dropped, so that multiple modifications done\nunder the same locked region only issue a single flush.\n\nFreeing of paging structures however is not deferred until the flushing is\ndone, and can result in freed pages transiently being present in cached state.\nSuch stale entries can point to memory ranges not owned by the guest, thus\nallowing access to unintended memory regions.","status":"published","published":"2026-03-23T07:16:07.2Z","modified":"2026-10-01T02:17:49.211000646Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:50.269992Z"},{"id":"DEBIAN-CVE-2026-23554","description":"The Intel EPT paging code uses an optimization to defer flushing of any cached EPT state until the p2m lock is dropped, so that multiple modifications done under the same locked region only issue a single flush.  Freeing of paging structures however is not deferred until the flushing is done, and can result in freed pages transiently being present in cached state. Such stale entries can point to memory ranges not owned by the guest, thus allowing access to unintended memory regions.","status":"published","published":"2026-03-23T07:16:07.2Z","modified":"2026-10-04T22:00:07.942546353Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:53.516942Z"},{"id":"UBUNTU-CVE-2026-23554","description":"The Intel EPT paging code uses an optimization to defer flushing of any cached EPT state until the p2m lock is dropped, so that multiple modifications done under the same locked region only issue a single flush. Freeing of paging structures however is not deferred until the flushing is done, and can result in freed pages transiently being present in cached state. Such stale entries can point to memory ranges not owned by the guest, thus allowing access to unintended memory regions.","status":"published","published":"2026-03-23T07:16:00Z","modified":"2026-10-17T12:58:07.15743185Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:04.456047Z"},{"id":"MGASA-2026-0068","title":"Updated xen packages fix security vulnerability","description":"Use after free of paging structures in EPT. (CVE-2026-23554)\n","status":"published","published":"2026-03-25T17:31:36Z","modified":"2026-04-16T04:43:56.620255583Z","updated_at":"2026-11-02T15:49:43.178336Z"},{"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-2026:1092-1","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","status":"published","published":"2026-03-26T17:51:51Z","modified":"2026-03-28T08:45:55.428658Z","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"}]}}