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{"acknowledgement": "Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Julien Grall (Citrix) as the original reporter.", "bugzilla": {"description": "xen: Long running memory operations on ARM cause DoS", "id": "1284911", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1284911"}, "csaw": false, "cvss": {"cvss_base_score": "6.3", "cvss_scoring_vector": "AV:N/AC:M/Au:S/C:N/I:N/A:C", "status": "draft"}, "cvss3": {"cvss3_base_score": "6.2", "cvss3_scoring_vector": "CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["Xen 4.6.x and earlier does not properly enforce limits on page order inputs for the (1) XENMEM_increase_reservation, (2) XENMEM_populate_physmap, (3) XENMEM_exchange, and possibly other HYPERVISOR_memory_op suboperations, which allows ARM guest OS administrators to cause a denial of service (CPU consumption, guest reboot, or watchdog timeout and host reboot) and possibly have unspecified other impact via unknown vectors.", "A flaw was discovered in xen host that prevented the use of a physical CPU for a significant period of time. This can cause a softlockup or watchdog timeout in both the host and other guests."], "name": "CVE-2015-8338", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "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:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-alt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:enterprise_mrg:2", "fix_state": "Not affected", "package_name": "realtime-kernel", "product_name": "Red Hat Enterprise MRG 2"}], "public_date": "2015-12-08T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2015-8338\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-8338\nhttp://xenbits.xen.org/xsa/advisory-158.html"], "statement": "This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, and 7, Red Hat Enterprise MRG 2, and realtime kernels.\nAt the time of writing, XEN on Red Hat Enterprise Linux 5 did not support ARM guests. XEN was not available on versions Red Hat Enterprise Linux 6 and 7, Red Hat Enterprise MRG 2, and realtime kernels.", "threat_severity": "Important"}