Fixed
Created: Sep 22, 2019
Updated: Jul 1, 2020
Resolved Date: Nov 14, 2019
Found In Version: 7.0.0.1
Fix Version: 7.0.0.31
Severity: Standard
Applicable for: Wind River Linux 7
Component/s: Kernel
An out-of-bounds access issue was found in the Linux kernel, all versions through 5.3, in the way Linux kernel's KVM hypervisor implements the Coalesced MMIO write operation. It operates on an MMIO ring buffer 'struct kvm_coalesced_mmio' object, wherein write indices 'ring->first' and 'ring->last' value could be supplied by a host user-space process. An unprivileged host user or process with access to '/dev/kvm' device could use this flaw to crash the host kernel, resulting in a denial of service or potentially escalating privileges on the system.
CREATE(Triage):(User=admin) [CVE-2019-14821|https://nvd.nist.gov/vuln/detail/CVE-2019-14821]