{"id":"CVE-2026-42492","aliases":["ALPINE-CVE-2026-42492","DEBIAN-CVE-2026-42492","EUVD-2026-49771","GHSA-2hv5-3qjg-gjqr","UBUNTU-CVE-2026-42492","openSUSE-SU-2026:11441-1"],"status":"published","title":"vIRQ event channel binding may break Xenstore","description":"Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing.  To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced.  The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn't set up.  Unprivileged domains\ncan trigger that error path.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-10","score":0.00609,"percentile":0.49509,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-459"],"published":"2026-07-28T12:31:28Z","modified":"2026-10-17T13:00:05Z","fixes":[{"ecosystem":"Alpine:v3.24","package":"xen","fixed_in":["4.21.2-r0"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.24","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.21.2-r0"}]}]},{"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: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":"4.22.0_02-1.1"}]}],"bundled":12}],"products":[{"vendor":"xen","product":"xen"}],"references":[{"url":"https://xenbits.xenproject.org/xsa/advisory-496.html"},{"url":"http://xenbits.xen.org/xsa/advisory-496.html"},{"url":"http://www.openwall.com/lists/oss-security/2026/07/28/13"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42492"},{"url":"https://github.com/advisories/GHSA-2hv5-3qjg-gjqr"},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-42492","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-42492","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-42492","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-42492","tags":["report"]},{"url":"https://xenbits.xen.org/xsa/advisory-496.html","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42492","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42493","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42494","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62423","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62426","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62428","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62429","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62430","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62431","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62432","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62433","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62434","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-42492","title":"vIRQ event channel binding may break Xenstore","description":"Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing.  To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced.  The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn't set up.  Unprivileged domains\ncan trigger that error path.","status":"published","published":"2026-07-28T12:31:28.304Z","modified":"2026-07-28T16:33:22.683Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"adp"}],"cwes":["CWE-459"],"updated_at":"2026-11-02T13:40:35.004553Z"}],"euvd":[{"id":"EUVD-2026-49771","description":"Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing.  To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced.  The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn't set up.  Unprivileged domains\ncan trigger that error path.","status":"published","published":"2026-07-28T12:31:28Z","modified":"2026-07-28T16:33:22Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:02:30.949894Z"}],"ghsa":[{"id":"GHSA-2hv5-3qjg-gjqr","title":"Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing...","description":"Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing.  To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced.  The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn't set up.  Unprivileged domains\ncan trigger that error path.","status":"published","published":"2026-07-28T15:32:17Z","modified":"2026-07-28T18:33:03Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-459"],"updated_at":"2026-11-02T15:09:52.627235Z"}],"nvd":[{"id":"CVE-2026-42492","description":"Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing.  To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced.  The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn't set up.  Unprivileged domains\ncan trigger that error path.","status":"published","published":"2026-07-28T13:18:32.123Z","modified":"2026-07-28T17:16:38.303Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-459"],"updated_at":"2026-11-02T14:12:33.249634Z"}],"osv":[{"id":"ALPINE-CVE-2026-42492","description":"Xenstore, to have an up-to-date picture of the entire system, wants to\nknow of domains appearing and disappearing.  To make this more robust, a\nnew XEN_DOMCTL_get_domain_state was introduced.  The management of the\nbitmap underlying that operation is tied into the binding of the\nVIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear\ndown the bitmap even in cases when it wasn't set up.  Unprivileged domains\ncan trigger that error path.","status":"published","published":"2026-07-28T13:18:32.123Z","modified":"2026-10-01T02:17:49.293402027Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:27:50.764331Z"},{"id":"DEBIAN-CVE-2026-42492","description":"Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appearing and disappearing.  To make this more robust, a new XEN_DOMCTL_get_domain_state was introduced.  The management of the bitmap underlying that operation is tied into the binding of the VIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear down the bitmap even in cases when it wasn't set up.  Unprivileged domains can trigger that error path.","status":"withdrawn","published":"2026-07-28T13:18:32.123Z","modified":"2026-07-31T14:01:44.717505188Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:55.251751Z"},{"id":"UBUNTU-CVE-2026-42492","description":"Xenstore, to have an up-to-date picture of the entire system, wants to know of domains appearing and disappearing.  To make this more robust, a new XEN_DOMCTL_get_domain_state was introduced.  The management of the bitmap underlying that operation is tied into the binding of the VIRQ_DOM_EXC virtual IRQ.  Unfortunately an error path there would tear down the bitmap even in cases when it wasn't set up.  Unprivileged domains can trigger that error path.","status":"published","published":"2026-07-28T13:18:00Z","modified":"2026-10-17T13:00:05.629574845Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:56:18.393417Z"},{"id":"openSUSE-SU-2026:11441-1","title":"xen-4.22.0_02-1.1 on GA media","description":"These are all security issues fixed in the xen-4.22.0_02-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-08-03T00:00:00Z","modified":"2026-08-04T11:45:04.940392014Z","updated_at":"2026-11-02T16:58:39.516824Z"}]}}