Red Hat Bugzilla – Bug 1284847
CVE-2015-7513 Kernel: kvm: divide by zero issue leads to DoS
Last modified: 2016-05-20 07:29:34 EDT
Linux kernel built with the KVM virtualisation support(CONFIG_KVM) is vulnerable to a divide by zero issue. It 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 guest attempts to read those.
A privileged guest user with access to PIT I/O ports, could use this issue to crash the host kernel resulting in DoS.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1296142]
This issue does not affect the versions of the kernel package as shipped with
Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.
This issue affects the versions of Linux kernel as shipped with
Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.
This has been rated as having Moderate security impact and is not currently
planned to be addressed in future updates. For additional information, refer
to the Red Hat Enterprise Linux Life Cycle:
kernel-4.3.3-301.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.3.3-303.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.3.4-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.