{"id":"CVE-2026-42493","aliases":["ALPINE-CVE-2026-42493","DEBIAN-CVE-2026-42493","EUVD-2026-49770","GHSA-7jxp-562x-944j","SUSE-SU-2026:3409-1","SUSE-SU-2026:3423-1","SUSE-SU-2026:3451-1","SUSE-SU-2026:3462-1","SUSE-SU-2026:4090-1","UBUNTU-CVE-2026-42493","openSUSE-SU-2026:11441-1"],"status":"published","title":"x86 shadow paging is deprecated","description":"Addressing certain issues, in particular related to operations which may\ntake excessively long and therefore would need preemption, has turned out\noverly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly\navailable, the decision was to deprecate the functionality, while still\nretaining it for people to use at their own (security) risk.  Memory-wise\nsmall enough guests may still be okay to run.","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":0.0045,"percentile":0.394,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-400"],"published":"2026-07-28T12:31:11Z","modified":"2026-10-17T13:00:05Z","fixes":[{"ecosystem":"Alpine:v3.21","package":"xen","fixed_in":["4.19.6-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"xen","fixed_in":["4.20.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"xen","fixed_in":["4.20.4-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"xen","fixed_in":["4.21.2-r0"],"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"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.21","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.19.6-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.4-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.20.4-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"xen","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.21.2-r0"}]}]},{"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":"SUSE:Linux 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shadow paging is deprecated","description":"Addressing certain issues, in particular related to operations which may\ntake excessively long and therefore would need preemption, has turned out\noverly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly\navailable, the decision was to deprecate the functionality, while still\nretaining it for people to use at their own (security) risk.  Memory-wise\nsmall enough guests may still be okay to run.","status":"published","published":"2026-07-28T12:31:11.95Z","modified":"2026-07-28T16:33:23.792Z","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-400"],"updated_at":"2026-11-02T13:40:23.731501Z"}],"euvd":[{"id":"EUVD-2026-49770","description":"Addressing certain issues, in particular related to operations which may\ntake excessively long and therefore would need preemption, has turned out\noverly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly\navailable, the decision was to deprecate the functionality, while still\nretaining it for people to use at their own (security) risk.  Memory-wise\nsmall enough guests may still be okay to run.","status":"published","published":"2026-07-28T12:31:11Z","modified":"2026-07-28T16:33:23Z","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-7jxp-562x-944j","title":"Addressing certain issues, in particular related to operations which may\ntake excessively long...","description":"Addressing certain issues, in particular related to operations which may\ntake excessively long and therefore would need preemption, has turned out\noverly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly\navailable, the decision was to deprecate the functionality, while still\nretaining it for people to use at their own (security) risk.  Memory-wise\nsmall enough guests may still be okay to run.","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-400"],"updated_at":"2026-11-02T15:09:52.627235Z"}],"nvd":[{"id":"CVE-2026-42493","description":"Addressing certain issues, in particular related to operations which may\ntake excessively long and therefore would need preemption, has turned out\noverly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly\navailable, the decision was to deprecate the functionality, while still\nretaining it for people to use at their own (security) risk.  Memory-wise\nsmall enough guests may still be okay to run.","status":"published","published":"2026-07-28T13:18:32.247Z","modified":"2026-07-28T17:16:39.063Z","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-400"],"updated_at":"2026-11-02T14:12:33.249634Z"}],"osv":[{"id":"ALPINE-CVE-2026-42493","description":"Addressing certain issues, in particular related to operations which may\ntake excessively long and therefore would need preemption, has turned out\noverly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly\navailable, the decision was to deprecate the functionality, while still\nretaining it for people to use at their own (security) risk.  Memory-wise\nsmall enough guests may still be okay to run.","status":"published","published":"2026-07-28T13:18:32.247Z","modified":"2026-10-01T02:17:49.294010071Z","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-2026-42493","description":"Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk.  Memory-wise small enough guests may still be okay to run.","status":"published","published":"2026-07-28T13:18:32.247Z","modified":"2026-10-04T22:00:06.683279775Z","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-2026-42493","description":"Addressing certain issues, in particular related to operations which may take excessively long and therefore would need preemption, has turned out overly costly.  Since alternatives (HVM/PVH: HAP, PV: shim) are commonly available, the decision was to deprecate the functionality, while still retaining it for people to use at their own (security) risk.  Memory-wise small enough guests may still be okay to run.","status":"published","published":"2026-07-28T13:18:00Z","modified":"2026-10-17T13:00:05.582977843Z","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"},{"id":"SUSE-SU-2026:3409-1","title":"Security update for xen","description":"This update for xen fixes the following issues\n\n- CVE-2026-42493: x86 shadow paging is deprecated (bsc#1271528).\n- CVE-2026-42494,CVE-2026-42495,CVE-2026-62423,CVE-2026-62424,CVE-2026-62425: buffer overruns in libfsimage iso9660 handling (bsc#1271530).\n- CVE-2026-62426,CVE-2026-62427: sysctl and platform-op locks open to abuse (bsc#1271531).\n- CVE-2026-62428: grant-table: type confusion in grant-copy (bsc#1271532).\n- CVE-2026-62429: vNUMA domain cleanup may race other operations (bsc#1271534).\n- CVE-2026-62430: x86: Out-of-bounds read in vRTC emulation (bsc#1271535).\n- CVE-2026-62431: Viridian STIMER division by zero (bsc#1271536).\n- CVE-2026-62432: evtchn: Race between FIFO expand and reset (bsc#1271537).\n- CVE-2026-62433: correct buffer checks for DM_OP hypercalls (bsc#1271538).\n- CVE-2026-62434: PoD: Don't try to reclaim special pages (bsc#1271539).\n- pygrub is only supported in de-privileged mode (XSA-508) (bsc#1271947).\n","status":"published","published":"2026-07-29T11:18:18Z","modified":"2026-07-30T17:15:09.37500199Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"SUSE-SU-2026:3423-1","title":"Security update for xen","description":"This update for xen fixes the following issues\n\n- CVE-2026-42493: x86 shadow paging is deprecated (bsc#1271528).\n- CVE-2026-42494,CVE-2026-42495,CVE-2026-62423,CVE-2026-62424,CVE-2026-62425: buffer overruns in libfsimage iso9660 handling (bsc#1271530).\n- CVE-2026-62426,CVE-2026-62427: sysctl and platform-op locks open to abuse (bsc#1271531).\n- CVE-2026-62428: grant-table: type confusion in grant-copy (bsc#1271532).\n- CVE-2026-62429: vNUMA domain cleanup may race other operations (bsc#1271534).\n- CVE-2026-62430: x86: Out-of-bounds read in vRTC emulation (bsc#1271535).\n- CVE-2026-62431: Viridian STIMER division by zero (bsc#1271536).\n- CVE-2026-62432: evtchn: Race between FIFO expand and reset (bsc#1271537).\n- CVE-2026-62433: correct buffer checks for DM_OP hypercalls (bsc#1271538).\n- CVE-2026-62434: PoD: Don't try to reclaim special pages (bsc#1271539).\n- pygrub is only supported in de-privileged mode (XSA-508) (bsc#1271947).\n","status":"published","published":"2026-07-30T07:50:00Z","modified":"2026-07-30T17:15:08.109634165Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"SUSE-SU-2026:3451-1","title":"Security update for xen","description":"This update for xen fixes the following issues\n\n- CVE-2026-42493: x86 shadow paging is deprecated (bsc#1271528).\n- CVE-2026-42494,CVE-2026-42495,CVE-2026-62423,CVE-2026-62424,CVE-2026-62425: buffer overruns in libfsimage iso9660 handling (bsc#1271530).\n- CVE-2026-62426,CVE-2026-62427: sysctl and platform-op locks open to abuse (bsc#1271531).\n- CVE-2026-62428: grant-table: type confusion in grant-copy (bsc#1271532).\n- CVE-2026-62429: vNUMA domain cleanup may race other operations (bsc#1271534).\n- CVE-2026-62430: x86: Out-of-bounds read in vRTC emulation (bsc#1271535).\n- CVE-2026-62432: evtchn: Race between FIFO expand and reset (bsc#1271537).\n- CVE-2026-62433: correct buffer checks for DM_OP hypercalls (bsc#1271538).\n- CVE-2026-62434: PoD: Don't try to reclaim special pages (bsc#1271539).\n- pygrub is only supported in de-privileged mode (XSA-508) (bsc#1271947).\n","status":"published","published":"2026-08-03T11:33:31Z","modified":"2026-08-04T11:45:06.334110948Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"SUSE-SU-2026:3462-1","title":"Security update for xen","description":"This update for xen fixes the following issues\n\n- CVE-2026-42493: x86 shadow paging is deprecated (bsc#1271528).\n- CVE-2026-42494,CVE-2026-42495,CVE-2026-62423,CVE-2026-62424,CVE-2026-62425: buffer overruns in libfsimage iso9660 handling (bsc#1271530).\n- CVE-2026-62426,CVE-2026-62427: sysctl and platform-op locks open to abuse (bsc#1271531).\n- CVE-2026-62428: grant-table: type confusion in grant-copy (bsc#1271532).\n- CVE-2026-62429: vNUMA domain cleanup may race other operations (bsc#1271534).\n- CVE-2026-62430: x86: Out-of-bounds read in vRTC emulation (bsc#1271535).\n- CVE-2026-62431: Viridian STIMER division by zero (bsc#1271536).\n- CVE-2026-62432: evtchn: Race between FIFO expand and reset (bsc#1271537).\n- CVE-2026-62433: correct buffer checks for DM_OP hypercalls (bsc#1271538).\n- CVE-2026-62434: PoD: Don't try to reclaim special pages (bsc#1271539).\n- pygrub is only supported in de-privileged mode (XSA-508) (bsc#1271947).\n","status":"published","published":"2026-08-03T12:17:12Z","modified":"2026-08-04T11:45:09.007296608Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"SUSE-SU-2026:4090-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\nUpdate to version 4.20.3 (jsc#PED-8907).\n\nSecurity issues fixed:\n\n- CVE-2026-42493: x86 shadow paging is deprecated (bsc#1271528).\n- CVE-2026-42494,CVE-2026-42495,CVE-2026-62423,CVE-2026-62424,CVE-2026-62425: buffer overruns in libfsimage iso9660\n  handling (bsc#1271530).\n- CVE-2026-62426,CVE-2026-62427: sysctl and platform-op locks open to abuse (bsc#1271531).\n- CVE-2026-62428: grant-table: type confusion in grant-copy (bsc#1271532).\n- CVE-2026-62429: vNUMA domain cleanup may race other operations (bsc#1271534).\n- CVE-2026-62430: x86: Out-of-bounds read in vRTC emulation (bsc#1271535).\n- CVE-2026-62431: Viridian STIMER division by zero (bsc#1271536).\n- CVE-2026-62432: evtchn: Race between FIFO expand and reset (bsc#1271537).\n- CVE-2026-62433: correct buffer checks for DM_OP hypercalls (bsc#1271538).\n- CVE-2026-62434: PoD: Don't try to reclaim special pages (bsc#1271539).\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- pygrub is only supported in de-privileged mode (bsc#1271947).\n\nNon security issue fixed:\n\n- Xen: Missing upstream bug fixes (bsc#1027519).\n","status":"published","published":"2026-09-08T12:26:56Z","modified":"2026-09-13T18:23:20.566887008Z","updated_at":"2026-11-02T15:54:05.392906Z"}]}}