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CVE-2019-14821

8.8 · HIGH

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.

Published Sep 19, 2019CWE-787EPSS 0.76%

Overview

CVE-2019-14821 is a high-severity vulnerability. It was published on September 19, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Reflists.opensuse.org/opensuse-security-announce/2019-10/msg00036.htmlReflists.opensuse.org/opensuse-security-announce/2019-10/msg00037.htmlRefpacketstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.htmlRefpacketstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.htmlRefwww.openwall.com/lists/oss-security/2019/09/20/1Refaccess.redhat.com/errata/RHSA-2019:3309Refaccess.redhat.com/errata/RHSA-2019:3517Refaccess.redhat.com/errata/RHSA-2019:3978Refaccess.redhat.com/errata/RHSA-2019:3979Refaccess.redhat.com/errata/RHSA-2019:4154

How CyberStrike helps

Frequently asked questions

What is CVE-2019-14821?

CVE-2019-14821 is a high-severity vulnerability. It was published on September 19, 2019 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2019-14821?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2019-14821?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2019-14821?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2019-14821 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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