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Vulnerability Details : CVE-2019-14821

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.
Publish Date : 2019-09-19 Last Update Date : 2019-09-23
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- CVSS Scores & Vulnerability Types

CVSS Score
Confidentiality Impact Complete (There is total information disclosure, resulting in all system files being revealed.)
Integrity Impact Complete (There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the entire system being compromised.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s) Denial Of Service
CWE ID 787

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2019:3309: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20193309 unix
RHSA-2019:3517: kernel security, bug fix, and enhancement update (Important) oval:com.redhat.rhsa:def:20193517 unix
RHSA-2019:3978: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20193978 unix
RHSA-2019:3979: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20193979 unix
RHSA-2019:4256: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20194256 unix
RHSA-2020:0027: kpatch-patch security update (Important) oval:com.redhat.rhsa:def:20200027 unix
RHSA-2020:0204: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20200204 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2019-14821

# Product Type Vendor Product Version Update Edition Language
1 OS Linux Linux Kernel 5.3 Version Details Vulnerabilities
2 OS Redhat Enterprise Linux 5.0 Version Details Vulnerabilities
3 OS Redhat Enterprise Linux 6.0 Version Details Vulnerabilities
4 OS Redhat Enterprise Linux 7.0 Version Details Vulnerabilities
5 OS Redhat Enterprise Linux 8.0 Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Linux Linux Kernel 1
Redhat Enterprise Linux 4

- References For CVE-2019-14821[email protected]/message/TRZQQQANZWQMPILZV7OTS3RGGRLLE2Q7/
MLIST [debian-lts-announce] 20191001 [SECURITY] [DLA 1940-1] linux-4.9 security update
MLIST [debian-lts-announce] 20190925 [SECURITY] [DLA 1930-1] linux security update
BUGTRAQ 20190925 [SECURITY] [DSA 4531-1] linux security update
MLIST [oss-security] 20190920 CVE-2019-14821 Kernel: KVM: OOB memory access via mmio ring buffer

- Metasploit Modules Related To CVE-2019-14821

There are not any metasploit modules related to this CVE entry (Please visit for more information)

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