{"id":"CVE-2026-79611","aliases":["ALPINE-CVE-2026-79611","DEBIAN-CVE-2026-79611","EUVD-2026-98828","GHSA-28w8-qvww-f539","SUSE-SU-2026:4641-1","SUSE-SU-2026:4642-1","SUSE-SU-2026:4732-1","SUSE-SU-2026:4942-1","SUSE-SU-2026:5140-1","UBUNTU-CVE-2026-79611","openSUSE-SU-2026:12138-1"],"status":"published","title":"VMX: VMentry failure with branch tracing and blocked states","description":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the\nexact combination of state which occurs when #DB in intercepted, Single\nStepping is active, and blocked by STI/MovSS is active, despite this being\na legitimate state to be in.  The resulting VMEntry failure is fatal to\nthe guest.\n\nSadly there is another special sub-case of the above, with branch tracing\nenabled.  In that case the prior adjustment would still cause a VMentry\nfailure, as before fatal to the guest.","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":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00161,"percentile":0.05311,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-843"],"published":"2026-10-13T13:09:06Z","modified":"2026-11-10T13:15:07Z","fixes":[{"ecosystem":"Alpine:v3.21","package":"xen","fixed_in":["4.19.6-r2"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"xen","fixed_in":["4.20.4-r2"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"xen","fixed_in":["4.20.4-r2"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"xen","fixed_in":["4.21.2-r2"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"xen","fixed_in":["4.17.7+13-g2445b30a44-0+deb12u1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"xen","fixed_in":["4.20.4+39-gf1e1321c87-0+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"xen","fixed_in":["4.20.4+39-gf1e1321c87-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.21","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.19.6-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.4-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.4-r2"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.21.2-r2"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.17.7+13-g2445b30a44-0+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","4.17.7-0+deb12u1"]},{"source":"osv","ecosystem":"Debian:13","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.4+39-gf1e1321c87-0+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","4.20.3+127-gc42374a105-0+deb13u1","4.20.3+127-gc42374a105-1"]},{"source":"osv","ecosystem":"Debian:14","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.4+39-gf1e1321c87-1"}]}],"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","4.20.3+127-gc42374a105-1"]},{"source":"osv","ecosystem":"SUSE:Linux 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"title":"VMX: VMentry failure with branch tracing and blocked states","description":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the\nexact combination of state which occurs when #DB in intercepted, Single\nStepping is active, and blocked by STI/MovSS is active, despite this being\na legitimate state to be in.  The resulting VMEntry failure is fatal to\nthe guest.\n\nSadly there is another special sub-case of the above, with branch tracing\nenabled.  In that case the prior adjustment would still cause a VMentry\nfailure, as before fatal to the guest.","status":"published","published":"2026-10-13T15:44:56.361Z","modified":"2026-10-20T17:31:41.971Z","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":"adp"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T13:50:38.739766Z"}],"euvd":[{"id":"EUVD-2026-98828","description":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the\nexact combination of state which occurs when #DB in intercepted, Single\nStepping is active, and blocked by STI/MovSS is active, despite this being\na legitimate state to be in.  The resulting VMEntry failure is fatal to\nthe guest.\n\nSadly there is another special sub-case of the above, with branch tracing\nenabled.  In that case the prior adjustment would still cause a VMentry\nfailure, as before fatal to the guest.","status":"published","published":"2026-10-13T15:44:56Z","modified":"2026-10-20T17:31:41Z","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":"2026-11-02T16:59:43.600473Z"}],"ghsa":[{"id":"GHSA-28w8-qvww-f539","title":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the\nexact combination of...","description":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the\nexact combination of state which occurs when #DB in intercepted, Single\nStepping is active, and blocked by STI/MovSS is active, despite this being\na legitimate state to be in.  The resulting VMEntry failure is fatal to\nthe guest.\n\nSadly there is another special sub-case of the above, with branch tracing\nenabled.  In that case the prior adjustment would still cause a VMentry\nfailure, as before fatal to the guest.","status":"published","published":"2026-10-13T18:30:52Z","modified":"2026-10-20T18:32:36Z","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"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T15:14:04.153849Z"}],"nvd":[{"id":"CVE-2026-79611","description":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the\nexact combination of state which occurs when #DB in intercepted, Single\nStepping is active, and blocked by STI/MovSS is active, despite this being\na legitimate state to be in.  The resulting VMEntry failure is fatal to\nthe guest.\n\nSadly there is another special sub-case of the above, with branch tracing\nenabled.  In that case the prior adjustment would still cause a VMentry\nfailure, as before fatal to the guest.","status":"published","published":"2026-10-13T16:17:23.347Z","modified":"2026-10-20T18:17:22.447Z","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":"secondary"}],"cwes":["CWE-843"],"updated_at":"2026-11-02T14:12:57.132005Z"}],"osv":[{"id":"ALPINE-CVE-2026-79611","description":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the\nexact combination of state which occurs when #DB in intercepted, Single\nStepping is active, and blocked by STI/MovSS is active, despite this being\na legitimate state to be in.  The resulting VMEntry failure is fatal to\nthe guest.\n\nSadly there is another special sub-case of the above, with branch tracing\nenabled.  In that case the prior adjustment would still cause a VMentry\nfailure, as before fatal to the guest.","status":"published","published":"2026-10-13T16:17:23.347Z","modified":"2026-10-23T18:30:03.151038925Z","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":"2026-11-02T15:27:50.764331Z"},{"id":"DEBIAN-CVE-2026-79611","description":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the exact combination of state which occurs when #DB in intercepted, Single Stepping is active, and blocked by STI/MovSS is active, despite this being a legitimate state to be in.  The resulting VMEntry failure is fatal to the guest.  Sadly there is another special sub-case of the above, with branch tracing enabled.  In that case the prior adjustment would still cause a VMentry failure, as before fatal to the guest.","status":"published","published":"2026-10-13T16:17:23.347Z","modified":"2026-11-04T23:02:29.644295159Z","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":"2026-11-04T23:09:59.08306Z"},{"id":"UBUNTU-CVE-2026-79611","description":"For XSA-308 logic was introduced, as VMX VMEntry checks do not like the exact combination of state which occurs when #DB in intercepted, Single Stepping is active, and blocked by STI/MovSS is active, despite this being a legitimate state to be in.  The resulting VMEntry failure is fatal to the guest. Sadly there is another special sub-case of the above, with branch tracing enabled.  In that case the prior adjustment would still cause a VMentry failure, as before fatal to the guest.","status":"published","published":"2026-10-13T16:17:00Z","modified":"2026-10-28T17:42:51Z","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":"2026-11-02T16:57:18.015985Z"},{"id":"openSUSE-SU-2026:12138-1","title":"xen-4.22.0_06-1.1 on GA media","description":"These are all security issues fixed in the xen-4.22.0_06-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-10-14T00:00:00Z","modified":"2026-10-15T17:23:13.673055893Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"SUSE-SU-2026:4641-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).\n- CVE-2026-79610: grant-table: double version change race (bsc#1283322).\n- CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).\n- CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).\n\nNon security issue fixed:\n\n- Xen: Missing upstream bug fixes (bsc#1027519).\n\n","status":"published","published":"2026-10-13T13:09:06Z","modified":"2026-10-14T17:30:07.611349803Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"SUSE-SU-2026:4642-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).\n- CVE-2026-79610: grant-table: double version change race (bsc#1283322).\n- CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).\n- CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).\n","status":"published","published":"2026-10-13T13:09:35Z","modified":"2026-10-14T17:30:07.606902014Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"SUSE-SU-2026:4732-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).\n- CVE-2026-79610: grant-table: double version change race (bsc#1283322).\n- CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).\n- CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).\n","status":"published","published":"2026-10-19T07:15:05Z","modified":"2026-10-20T17:24:00.3463403Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"SUSE-SU-2026:4942-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2026-79608: x86/AMD: ineffectual Zenbleed workaround (bsc#1283317).\n- CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).\n- CVE-2026-79610: grant-table: double version change race (bsc#1283322).\n- CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).\n- CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).\n","status":"published","published":"2026-10-29T16:29:02Z","modified":"2026-10-31T18:00:03.930410439Z","updated_at":"2026-11-02T15:54:05.838224Z"},{"id":"SUSE-SU-2026:5140-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\nSecurity issues fixed:\n\n- CVE-2026-62437: x86: DMs may cause mem leak by IRQ binding (bsc#1276838).\n- CVE-2026-79602: x86: improper handling of HVM emulation return codes (bsc#1276839).\n- CVE-2026-79603: unconditionally do TLB flushing ahead of page scrubbing (bsc#1276841).\n- CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).\n- CVE-2026-79610: grant-table: double version change race (bsc#1283322).\n- CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).\n- CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).\n- CVE-2026-102703,CVE-2026-102704: arbitrary read/write via grant copy (bsc#1288663).\n\nNon security issue fixed:\n\n- Update to Xen 4.18.6 security bug fix release (bsc#1027519).\n","status":"published","published":"2026-11-09T13:24:47Z","modified":"2026-11-10T13:15:07.782924083Z","updated_at":"2026-11-10T13:29:51.103746Z"}]}}