Detections
Analytics
CVE-2018-18021
high
Description
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.
References
https://www.openwall.com/lists/oss-security/2018/10/02/2
https://www.debian.org/security/2018/dsa-4313
https://usn.ubuntu.com/3931-2/
https://usn.ubuntu.com/3931-1/
https://usn.ubuntu.com/3821-2/
https://usn.ubuntu.com/3821-1/
https://github.com/torvalds/linux/commit/d26c25a9d19b5976b319af528886f89cf455692d
https://github.com/torvalds/linux/commit/2a3f93459d689d990b3ecfbe782fec89b97d3279
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.12
https://access.redhat.com/errata/RHSA-2018:3656