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.
lists.opensuse.org/opensuse-security-announce/2019-10/msg00036.html
lists.opensuse.org/opensuse-security-announce/2019-10/msg00037.html
packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.html
packetstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
www.openwall.com/lists/oss-security/2019/09/20/1
access.redhat.com/errata/RHSA-2019:3309
access.redhat.com/errata/RHSA-2019:3517
access.redhat.com/errata/RHSA-2019:3978
access.redhat.com/errata/RHSA-2019:3979
access.redhat.com/errata/RHSA-2019:4154
access.redhat.com/errata/RHSA-2019:4256
access.redhat.com/errata/RHSA-2020:0027
access.redhat.com/errata/RHSA-2020:0204
bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14821
lists.debian.org/debian-lts-announce/2019/09/msg00025.html
lists.debian.org/debian-lts-announce/2019/10/msg00000.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TRZQQQANZWQMPILZV7OTS3RGGRLLE2Q7/
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YW3QNMPENPFEGVTOFPSNOBL7JEIJS25P/
seclists.org/bugtraq/2019/Nov/11
seclists.org/bugtraq/2019/Sep/41
security.netapp.com/advisory/ntap-20191004-0001/
usn.ubuntu.com/4157-1/
usn.ubuntu.com/4157-2/
usn.ubuntu.com/4162-1/
usn.ubuntu.com/4162-2/
usn.ubuntu.com/4163-1/
usn.ubuntu.com/4163-2/
www.debian.org/security/2019/dsa-4531
www.oracle.com/security-alerts/cpuapr2020.html