Marc Zyngier

3 exploits Active since Sep 2017
CVE-2018-18021 WRITEUP HIGH WRITEUP
Linux Kernel < 4.18.12 - Unauthenticated Denial of Service and Control Flow Hijack via KVM_SET_ON_REG ioctl
arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.
CVSS 7.1
CVE-2017-12168 WRITEUP MEDIUM WRITEUP
Linux kernel < 4.8.11 - Denial of Service via KVM PMCCNTR Access
The access_pmu_evcntr function in arch/arm64/kvm/sys_regs.c in the Linux kernel before 4.8.11 allows privileged KVM guest OS users to cause a denial of service (assertion failure and host OS crash) by accessing the Performance Monitors Cycle Count Register (PMCCNTR).
CVSS 6.0
CVE-2018-18021 WRITEUP HIGH WRITEUP
Linux Kernel < 4.18.12 - Unauthenticated Denial of Service and Control Flow Hijack via KVM_SET_ON_REG ioctl
arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.
CVSS 7.1