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{"acknowledgement": "Red Hat would like to thank Xen for reporting this issue.", "bugzilla": {"description": "kernel: xen: Xen PV DoS vulnerability with SYSENTER", "id": "950668", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=950668"}, "csaw": false, "cvss": {"cvss_base_score": "5.7", "cvss_scoring_vector": "AV:A/AC:M/Au:N/C:N/I:N/A:C", "status": "draft"}, "details": ["Xen 3.1 through 4.x, when running 64-bit hosts on Intel CPUs, does not clear the NT flag when using an IRET after a SYSENTER instruction, which allows PV guest users to cause a denial of service (hypervisor crash) by triggering a #GP fault, which is not properly handled by another IRET instruction."], "name": "CVE-2013-1917", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Not affected", "package_name": "kernel-xen", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Not affected", "package_name": "realtime-kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2013-04-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2013-1917\nhttps://nvd.nist.gov/vuln/detail/CVE-2013-1917"], "statement": "Not vulnerable.\nThis issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5 as we did not have support for sysenter for 64bit PV guests running on the Xen hypervisor (introduced in upstream changeset 16207:aeebd173c3fa).\nThis issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.", "threat_severity": "Important"}