Date: Thu, 7 Jan 2016 16:29:15 +0530 (IST) From: P J P <ppandit@...hat.com> To: oss security list <oss-security@...ts.openwall.com> Subject: CVE-2015-7513 Kernel: kvm: divide by zero issue leads to DoS Hello, 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. Upstream patch: --------------- -> https://git.kernel.org/linus/0185604c2d82c560dab2f2933a18f797e74ab5a8 Reference: ---------- -> https://bugzilla.redhat.com/show_bug.cgi?id=1284847 It requires host user to set the PIT channel counters to zero(0). Thank you. -- Prasad J Pandit / Red Hat Product Security Team 47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
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