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The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs."}, {"lang": "es", "value": "Una declaraci\u00f3n en la gu\u00eda de programaci\u00f3n de sistemas del Manual del desarrollador de software (SDM) de las arquitecturas Intel 64 e IA-32 se manej\u00f3 incorrectamente en el desarrollo de algunos o todos los n\u00facleos del sistema operativo, lo que provoc\u00f3 un comportamiento inesperado para las excepciones #DB que son diferidas por MOV SS o POP SS, tal y como queda demostrado con (por ejemplo) el escalado de privilegios en Windows, macOS, algunas configuraciones Xen o FreeBSD, o un fallo del kernel de Linux. Las instrucciones de MOV a SS y POP SS inhiben interrupciones (incluyendo NMI), puntos de interrupci\u00f3n de datos y excepciones de trampas de un paso hasta los l\u00edmites de la instrucci\u00f3n que siguen a la siguiente instrucci\u00f3n (SDM Vol. 3A; secci\u00f3n 6.8.3). (Los puntos de interrupci\u00f3n de datos inhibidos son aquellos en la memoria a los que accede a la propia instrucci\u00f3n MOV a SS o POP a SS). Tenga en cuenta que las excepciones de depuraci\u00f3n no est\u00e1n inhibidas por el indicador del sistema de habilitaci\u00f3n de interrupciones (EFLAGS.IF) (SDM Vol. 3A; secci\u00f3n 2.3). Si la instrucci\u00f3n que sigue a la instrucci\u00f3n MOV a SS o POP a SS es una instrucci\u00f3n como SYSCALL, SYSENTER, INT 3, etc. que transfiere el control al sistema operativo a CPL < 3, la excepci\u00f3n de depuraci\u00f3n se entrega despu\u00e9s de que la transferencia a CPL < 3 se haya completado. Es posible que los kernels del sistema operativo no esperen este orden de eventos y, por lo tanto, puedan experimentar un comportamiento inesperado cuando ocurra."}], "id": "CVE-2018-8897", "lastModified": "2019-10-03T00:03:26.223", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "HIGH", "cvssData": {"accessComplexity": "LOW", "accessVector": "LOCAL", "authentication": "NONE", "availabilityImpact": "COMPLETE", "baseScore": 7.2, "confidentialityImpact": "COMPLETE", "integrityImpact": "COMPLETE", "vectorString": "AV:L/AC:L/Au:N/C:C/I:C/A:C", "version": "2.0"}, "exploitabilityScore": 3.9, "impactScore": 10.0, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.0"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2018-05-08T18:29:00.547", "references": [{"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d8ba61ba58c88d5207c1ba2f7d9a2280e7d03be9"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://openwall.com/lists/oss-security/2018/05/08/1"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://openwall.com/lists/oss-security/2018/05/08/4"}, {"source": "cve@mitre.org", "url": "http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20190921-01-debug-en"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", 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{"source": "cve@mitre.org", "url": "https://www.kb.cert.org/vuls/id/631579"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://www.synology.com/support/security/Synology_SA_18_21"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory"], "url": "https://www.triplefault.io/2018/05/spurious-db-exceptions-with-pop-ss.html"}, {"source": "cve@mitre.org", "tags": ["Patch", "Third Party Advisory"], "url": "https://xenbits.xen.org/xsa/advisory-260.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-362"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank Andy Lutomirski and Nick Peterson (Everdox Tech LLC) for reporting this issue.", "affected_release": [{"advisory": "RHSA-2018:1352", "cpe": "cpe:/o:redhat:rhel_aus:5.9", "package": "kernel-0:2.6.18-348.39.2.el5", "product_name": "Red Hat Enterprise Linux 5.9 Long Life", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1353", "cpe": "cpe:/o:redhat:rhel_els:5", "package": "kernel-0:2.6.18-431.el5", "product_name": "Red Hat Enterprise Linux 5 Extended Lifecycle Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1319", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "kernel-0:2.6.32-696.28.1.el6", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1349", "cpe": "cpe:/o:redhat:rhel_aus:6.4", "package": "kernel-0:2.6.32-358.88.2.el6", "product_name": "Red Hat Enterprise Linux 6.4 Advanced Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1350", "cpe": "cpe:/o:redhat:rhel_aus:6.5", "package": "kernel-0:2.6.32-431.89.2.el6", "product_name": "Red Hat Enterprise Linux 6.5 Advanced Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1351", "cpe": "cpe:/o:redhat:rhel_aus:6.6", "package": "kernel-0:2.6.32-504.68.2.el6", "product_name": "Red Hat Enterprise Linux 6.6 Advanced Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1351", "cpe": "cpe:/o:redhat:rhel_tus:6.6", "package": "kernel-0:2.6.32-504.68.2.el6", "product_name": "Red Hat Enterprise Linux 6.6 Telco Extended Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1346", "cpe": "cpe:/o:redhat:rhel_eus:6.7", "package": "kernel-0:2.6.32-573.55.2.el6", "product_name": "Red Hat Enterprise Linux 6.7 Extended Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1355", "cpe": "cpe:/a:redhat:rhel_extras_rt:7", "package": "kernel-rt-0:3.10.0-862.2.3.rt56.806.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1318", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "kernel-0:3.10.0-862.2.3.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1347", "cpe": "cpe:/o:redhat:rhel_aus:7.2", "package": "kernel-0:3.10.0-327.66.3.el7", "product_name": "Red Hat Enterprise Linux 7.2 Advanced Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1347", "cpe": "cpe:/o:redhat:rhel_tus:7.2", "package": "kernel-0:3.10.0-327.66.3.el7", "product_name": "Red Hat Enterprise Linux 7.2 Telco Extended Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1347", "cpe": "cpe:/o:redhat:rhel_e4s:7.2", "package": "kernel-0:3.10.0-327.66.3.el7", "product_name": "Red Hat Enterprise Linux 7.2 Update Services for SAP Solutions", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1348", "cpe": "cpe:/o:redhat:rhel_eus:7.3", "package": "kernel-0:3.10.0-514.48.3.el7", "product_name": "Red Hat Enterprise Linux 7.3 Extended Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1345", "cpe": "cpe:/o:redhat:rhel_eus:7.4", "package": "kernel-0:3.10.0-693.25.4.el7", "product_name": "Red Hat Enterprise Linux 7.4 Extended Update Support", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1354", "cpe": "cpe:/a:redhat:enterprise_mrg:2:server:el6", "package": "kernel-rt-1:3.10.0-693.25.4.rt56.613.el6rt", "product_name": "Red Hat Enterprise MRG 2", "release_date": "2018-05-08T00:00:00Z"}, {"advisory": "RHSA-2018:1524", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "imgbased-0:1.0.16-0.1.el7ev", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2018-05-15T00:00:00Z"}, {"advisory": "RHSA-2018:1524", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "ovirt-node-ng-0:4.2.0-0.20170814.0.el7", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2018-05-15T00:00:00Z"}, {"advisory": "RHSA-2018:1524", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-release-virtualization-host-0:4.2-3.0.el7", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2018-05-15T00:00:00Z"}, {"advisory": "RHSA-2018:1524", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:4.2-20180508.0", "product_name": "Red Hat Virtualization 4 for Red Hat Enterprise Linux 7", "release_date": "2018-05-15T00:00:00Z"}, {"advisory": "RHSA-2018:1711", "cpe": "cpe:/o:redhat:enterprise_linux:6::hypervisor", "package": "rhev-hypervisor7-0:7.3-20180521.1.el6ev", "product_name": "RHEV 3.X Hypervisor and Agents for RHEL-6", "release_date": "2018-05-23T00:00:00Z"}, {"advisory": "RHSA-2018:1710", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "redhat-virtualization-host-0:3.6-20180521.0", "product_name": "RHEV 3.X Hypervisor and Agents for RHEL-7 ELS", "release_date": "2018-05-23T00:00:00Z"}, {"advisory": "RHSA-2018:1711", "cpe": "cpe:/o:redhat:enterprise_linux:7::hypervisor", "package": "rhev-hypervisor7-0:7.3-20180521.1.el7ev", "product_name": "RHEV 3.X Hypervisor and Agents for RHEL-7 ELS", "release_date": "2018-05-23T00:00:00Z"}], "bugzilla": {"description": "Kernel: error in exception handling leads to DoS", "id": "1567074", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1567074"}, "csaw": true, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-250", "details": ["A statement in the System Programming Guide of the Intel 64 and IA-32 Architectures Software Developer's Manual (SDM) was mishandled in the development of some or all operating-system kernels, resulting in unexpected behavior for #DB exceptions that are deferred by MOV SS or POP SS, as demonstrated by (for example) privilege escalation in Windows, macOS, some Xen configurations, or FreeBSD, or a Linux kernel crash. The MOV to SS and POP SS instructions inhibit interrupts (including NMIs), data breakpoints, and single step trap exceptions until the instruction boundary following the next instruction (SDM Vol. 3A; section 6.8.3). (The inhibited data breakpoints are those on memory accessed by the MOV to SS or POP to SS instruction itself.) Note that debug exceptions are not inhibited by the interrupt enable (EFLAGS.IF) system flag (SDM Vol. 3A; section 2.3). If the instruction following the MOV to SS or POP to SS instruction is an instruction like SYSCALL, SYSENTER, INT 3, etc. that transfers control to the operating system at CPL < 3, the debug exception is delivered after the transfer to CPL < 3 is complete. OS kernels may not expect this order of events and may therefore experience unexpected behavior when it occurs.", "A flaw was found in the way the Linux kernel handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged system user could use this flaw to crash the system kernel resulting in the denial of service."], "name": "CVE-2018-8897", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/a:redhat:enterprise_linux:7::hypervisor", "fix_state": "Affected", "package_name": "rhev-hypervisor-ng", "product_name": "Red Hat Enterprise Virtualization 3"}, {"cpe": "cpe:/o:redhat:rhev_hypervisor:4", "fix_state": "Affected", "package_name": "rhev-hypervisor-ng", "product_name": "Red Hat Virtualization 4"}], "public_date": "2018-05-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-8897\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-8897\nhttps://access.redhat.com/security/vulnerabilities/pop_ss"], "statement": "This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7, and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise Linux 5, 6, 7, and Red Hat Enterprise MRG 2 may address this issue.", "threat_severity": "Moderate"}