{"id":"CVE-2025-27465","aliases":["ALPINE-CVE-2025-27465","DEBIAN-CVE-2025-27465","DSA-6068-1","EUVD-2025-21593","GHSA-2vp3-crwq-3fg5","MGASA-2025-0270","SUSE-SU-2025:02315-1","SUSE-SU-2025:02316-1","SUSE-SU-2025:02319-1","SUSE-SU-2025:02325-1","SUSE-SU-2025:02326-1","SUSE-SU-2025:02471-1","UBUNTU-CVE-2025-27465","openSUSE-SU-2025:15342-1"],"status":"published","title":"x86: Incorrect stubs exception handling for flags recovery","description":"Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub.  Some instructions may raise an exception, which is supposed to be\nhandled gracefully.  Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00705,"percentile":0.53796,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-755"],"published":"2025-07-11T00:00:00Z","modified":"2026-10-17T12:57:27Z","fixes":[{"ecosystem":"Alpine:v3.19","package":"xen","fixed_in":["4.18.5-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"xen","fixed_in":["4.18.5-r1"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"xen","fixed_in":["4.19.2-r2"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"xen","fixed_in":["4.20.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"xen","fixed_in":["4.20.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"xen","fixed_in":["4.20.1-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"xen","fixed_in":["4.17.5+72-g01140da4e8-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"xen","fixed_in":["4.20.2+7-g1badcf5035-0+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"xen","fixed_in":["4.20.2+7-g1badcf5035-1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux 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Incorrect stubs exception handling for flags recovery","description":"Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub.  Some instructions may raise an exception, which is supposed to be\nhandled gracefully.  Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead.","status":"published","published":"2025-07-16T09:08:39.931Z","modified":"2025-11-04T21:09:50.127Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"adp"}],"cwes":["CWE-755"],"updated_at":"2026-11-02T14:32:42.411662Z"}],"euvd":[{"id":"EUVD-2025-21593","description":"Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub.  Some instructions may raise an exception, which is supposed to be\nhandled gracefully.  Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead.","status":"published","published":"2025-07-16T09:08:39Z","modified":"2025-11-04T21:09:50Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T19:49:21.645169Z"}],"ghsa":[{"id":"GHSA-2vp3-crwq-3fg5","title":"Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the...","description":"Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub.  Some instructions may raise an exception, which is supposed to be\nhandled gracefully.  Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead.","status":"published","published":"2025-07-16T09:31:05Z","modified":"2025-11-05T00:31:22Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-755"],"updated_at":"2026-11-02T15:04:38.82847Z"}],"nvd":[{"id":"CVE-2025-27465","description":"Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub.  Some instructions may raise an exception, which is supposed to be\nhandled gracefully.  Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead.","status":"published","published":"2025-07-16T09:15:23.04Z","modified":"2026-06-17T09:03:38.197Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-755"],"updated_at":"2026-11-02T14:11:18.782156Z"}],"osv":[{"id":"ALPINE-CVE-2025-27465","description":"Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub.  Some instructions may raise an exception, which is supposed to be\nhandled gracefully.  Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead.","status":"published","published":"2025-07-16T09:15:23.04Z","modified":"2026-08-27T22:18:02.859577283Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:27:49.709457Z"},{"id":"CVE-2025-27465","description":"Certain instructions need intercepting and emulating by Xen.  In some\ncases Xen emulates the instruction by replaying it, using an executable\nstub.  Some instructions may raise an exception, which is supposed to be\nhandled gracefully.  Certain replayed instructions have additional logic\nto set up and recover the changes to the arithmetic flags.\n\nFor replayed instructions where the flags recovery logic is used, the\nmetadata for exception handling was incorrect, preventing Xen from\nhandling the the exception gracefully, treating it as fatal instead.","status":"published","published":"2025-07-16T09:15:23.04Z","modified":"2026-04-16T04:32:28.290187525Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:44:47.708311Z"},{"id":"DEBIAN-CVE-2025-27465","description":"Certain instructions need intercepting and emulating by Xen.  In some cases Xen emulates the instruction by replaying it, using an executable stub.  Some instructions may raise an exception, which is supposed to be handled gracefully.  Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags.  For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.","status":"published","published":"2025-07-16T09:15:23.04Z","modified":"2026-09-01T20:05:45.145560398Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:45:45.870237Z"},{"id":"UBUNTU-CVE-2025-27465","description":"Certain instructions need intercepting and emulating by Xen.  In some cases Xen emulates the instruction by replaying it, using an executable stub.  Some instructions may raise an exception, which is supposed to be handled gracefully.  Certain replayed instructions have additional logic to set up and recover the changes to the arithmetic flags. For replayed instructions where the flags recovery logic is used, the metadata for exception handling was incorrect, preventing Xen from handling the the exception gracefully, treating it as fatal instead.","status":"published","published":"2025-07-16T09:15:00Z","modified":"2026-10-17T12:57:27.242428077Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T16:55:26.330196Z"},{"id":"DSA-6068-1","title":"xen - security update","status":"published","published":"2025-12-02T00:00:00Z","modified":"2025-12-02T23:47:43.25474Z","updated_at":"2026-11-02T15:46:18.296714Z"},{"id":"MGASA-2025-0270","title":"Updated xen packages fix security vulnerabilities","description":"Double unlock in x86 guest IRQ handling. (CVE-2024-31143)\nXapi: Metadata injection attack against backup/restore functionality.\n(CVE-2024-31144)\nError handling in x86 IOMMU identity mapping. (CVE-2024-31145)\nPCI device pass-through with shared resources. (CVE-2024-31146)\nx86: Deadlock in vlapic_error(). (CVE-2024-45817)\nDeadlock in x86 HVM standard VGA handling. (CVE-2024-45818)\nlibxl leaks data to PVH guests via ACPI tables. (CVE-2024-45819)\nBackend can crash Linux netfront. (CVE-2024-53240)\nXen hypercall page unsafe against speculative attacks. (CVE-2024-53241)\nDeadlock potential with VT-d and legacy PCI device pass-through.\n(CVE-2025-1713)\nx86: Indirect Target Selection. (CVE-2024-28956)\nx86: Incorrect stubs exception handling for flags recovery.\n(CVE-2025-27465)\nTSA-SQ (TSA in the Store Queues). (CVE-2024-36350)\nTSA-L1 (TSA in the L1 data cache). (CVE-2024-36357)\nA NULL pointer dereference in the updating of the reference TSC area.\n(CVE-2025-27466)\nA NULL pointer dereference by assuming the SIM page is mapped when a\nsynthetic timer message has to be delivered. (CVE-2025-58142)\nA race in the mapping of the reference TSC page, where a guest can get\nXen to free a page while still present in the guest physical to machine\n(p2m) page tables. (CVE-2025-58143)\nAn assertion is wrong there, where the case actually needs handling.  A\nNULL pointer de-reference could result on a release build.\n(CVE-2025-58144)\nThe P2M lock isn't held until a page reference was actually obtained (or\nthe attempt to do so has failed).  Otherwise the page can not only\nchange type, but even ownership in between, thus allowing domain\nboundaries to be violated. (CVE-2025-58145)\nXAPI UTF-8 string handling. (CVE-2025-58146)\nHypercalls using the HV_VP_SET Sparse format can cause vpmask_set() to\nwrite out of bounds when converting the bitmap to Xen's format.\n(CVE-2025-58147)\nHypercalls using any input format can cause send_ipi() to read d-\u003evcpu[]\nout-of-bounds, and operate on a wild vCPU pointer.(CVE-2025-58148)\nIncorrect removal of permissions on PCI device unplug. (CVE-2025-58149)\n","status":"published","published":"2025-11-09T07:52:10Z","modified":"2026-04-16T04:42:58.080548709Z","updated_at":"2026-11-02T15:49:43.178336Z"},{"id":"openSUSE-SU-2025:15342-1","title":"xen-4.20.1_02-1.1 on GA media","description":"These are all security issues fixed in the xen-4.20.1_02-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-07-11T00:00:00Z","modified":"2026-02-04T03:20:17.695193Z","updated_at":"2026-11-02T16:58:37.810934Z"},{"id":"SUSE-SU-2025:02315-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- Update to Xen 4.20.1\n- CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)\n- CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)\n","status":"published","published":"2025-07-15T12:59:13Z","modified":"2026-03-23T04:46:30.779585Z","updated_at":"2026-11-02T15:53:56.647031Z"},{"id":"SUSE-SU-2025:02316-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)\n- CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)\n","status":"published","published":"2025-07-15T12:59:25Z","modified":"2026-03-23T04:49:36.777153Z","updated_at":"2026-11-02T15:53:56.647031Z"},{"id":"SUSE-SU-2025:02319-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)\n- CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)\n","status":"published","published":"2025-07-15T14:20:08Z","modified":"2026-03-23T04:46:31.57882Z","updated_at":"2026-11-02T15:53:56.647031Z"},{"id":"SUSE-SU-2025:02325-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)\n- CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)\n","status":"published","published":"2025-07-16T06:37:43Z","modified":"2026-02-04T04:15:23.239228Z","updated_at":"2026-11-02T15:53:56.647031Z"},{"id":"SUSE-SU-2025:02326-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\nSecurity fixes:\n\n- CVE-2024-28956: Fixed Intel CPU: Indirect Target Selection (ITS) (XSA-469) (bsc#1243117)\n- CVE-2024-53241: Fixed Xen hypercall page unsafe against speculative attacks (XSA-466) (bsc#1234282)\n- CVE-2025-1713: Fixed deadlock potential with VT-d and legacy PCI device pass-through (XSA-467) (bsc#1238043)\n- CVE-2024-36350, CVE-2024-36357: More AMD transient execution attacks (bsc#1246112, XSA-471)\n- CVE-2025-27465: Incorrect stubs exception handling for flags recovery (bsc#1244644, XSA-470)\n\nOther fixes:\n\n- Upstream bug fixes (bsc#1027519)\n","status":"published","published":"2025-07-16T06:37:59Z","modified":"2026-02-04T04:25:24.138469Z","updated_at":"2026-11-02T15:53:56.647031Z"},{"id":"SUSE-SU-2025:02471-1","title":"Security update for xen","description":"This update for xen fixes the following issues:\n\n- CVE-2025-27465: Fixed incorrect stubs exception handling for flags recovery (XSA-470) (bsc#1244644)\n- Fixed more AMD transient execution attacks (XSA-471) (bsc#1246112)\n","status":"published","published":"2025-07-22T22:58:21Z","modified":"2026-02-04T03:37:27.971676Z","updated_at":"2026-11-02T15:53:56.647031Z"}]}}