CVE-2019-14821

HIGH

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.

References

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://www.openwall.com/lists/oss-security/2019/09/20/1

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/[email protected]/message/TRZQQQANZWQMPILZV7OTS3RGGRLLE2Q7/

https://lists.fedoraproject.org/archives/list/[email protected]/message/YW3QNMPENPFEGVTOFPSNOBL7JEIJS25P/

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

Details

Source: MITRE

Published: 2019-09-19

Updated: 2019-09-24

Type: CWE-787

Risk Information

CVSS v2.0

Base Score: 7.2

Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Impact Score: 10

Exploitability Score: 3.9

Severity: HIGH

CVSS v3.0

Base Score: 8.8

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

Impact Score: 6

Exploitability Score: 2

Severity: HIGH