CVE-2019-14821

CVE Details

Release Date:	2019-09-19
Impact:	None	What is this?

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.

See more information about CVE-2019-14821 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	8.8
Vector String:	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Version:	3.0
Attack Vector:	Local
Attack Complexity:	Low
Privileges Required:	Low
User Interaction:	None
Scope:	Changed
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 6 (kernel)	ELSA-2019-4256	2019-12-18
Oracle Linux version 6 (kernel-uek)	ELSA-2019-4800	2019-09-20
Oracle Linux version 6 (kernel-uek)	ELSA-2019-4808	2019-10-01
Oracle Linux version 7 (kernel)	ELSA-2019-3979	2019-11-26
Oracle Linux version 7 (kernel-uek)	ELSA-2019-4799	2019-09-20
Oracle Linux version 7 (kernel-uek)	ELSA-2019-4800	2019-09-20
Oracle Linux version 7 (kernel-uek)	ELSA-2019-4808	2019-10-01
Oracle Linux version 7 (kernel-uek)	ELSA-2019-4820	2019-10-11
Oracle Linux version 8 (kernel)	ELSA-2019-3517	2019-11-14
Oracle VM version 3.4 (kernel-uek)	OVMSA-2019-0044	2019-09-20
Oracle VM version 3.4 (kernel-uek)	OVMSA-2019-0046	2019-10-02