CVE-2019-14821 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Reference

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

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8