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{"bugzilla": {"description": "Kernel: kvm: divide by zero issue leads to DoS", "id": "1284847", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1284847"}, "csaw": false, "cvss": {"cvss_base_score": "4.3", "cvss_scoring_vector": "AV:A/AC:H/Au:S/C:N/I:N/A:C", "status": "draft"}, "cwe": "CWE-369", "details": ["arch/x86/kvm/x86.c in the Linux kernel before 4.4 does not reset the PIT counter values during state restoration, which allows guest OS users to cause a denial of service (divide-by-zero error and host OS crash) via a zero value, related to the kvm_vm_ioctl_set_pit and kvm_vm_ioctl_set_pit2 functions.", "A divide-by-zero flaw was discovered in the Linux kernel built with KVM virtualization support(CONFIG_KVM). The flaw occurs in the KVM module's Programmable Interval Timer(PIT) emulation, when PIT counters for channel 1 or 2 are set to zero(0) and a privileged user inside the guest attempts to read these counters. A privileged guest user with access to PIT I/O ports could exploit this issue to crash the host kernel (denial of service)."], "name": "CVE-2015-7513", "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:6", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Will not fix", "package_name": "kernel", "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": "2016-01-05T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2015-7513\nhttps://nvd.nist.gov/vuln/detail/CVE-2015-7513"], "statement": "This issue does not affect the versions of the kernel package as shipped with\nRed Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.\nThis issue affects the versions of Linux kernel as shipped with\nRed Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.\nThis has been rated as having Moderate security impact and is not currently\nplanned to be addressed in future updates. For additional information, refer\nto the Red Hat Enterprise Linux Life Cycle:\nhttps://access.redhat.com/support/policy/updates/errata/", "threat_severity": "Moderate"}