CVE-2019-14821
HIGHCVSS 8.8/10EPSS 0.76%
Last modified
CVE-2019-14821 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.76% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 2.6.27, <= 3.15.10 | — |
| Linux | Linux Kernel | >= 3.16, < 3.16.74 | — |
| Linux | Linux Kernel | >= 4.4, < 4.4.194 | — |
| Linux | Linux Kernel | >= 4.9, < 4.9.194 | — |
| Linux | Linux Kernel | >= 4.14, < 4.14.146 | — |
| Linux | Linux Kernel | >= 4.19, < 4.19.75 | — |
| Linux | Linux Kernel | >= 5.2, < 5.2.17 | — |
| Linux | Linux Kernel | >= 5.3, < 5.3.1 | — |
| Linux | Linux Kernel | 5.4 | Rc1 |
| Redhat | Virtualization Host | 4.0 | — |
| Redhat | Enterprise Linux | 8.0 | — |
| Redhat | Enterprise Linux Desktop | 6.0 | — |
| Redhat | Enterprise Linux Desktop | 7.0 | — |
| Redhat | Enterprise Linux Eus | 7.7 | — |
| Redhat | Enterprise Linux For Real Time | 7 | — |
| Redhat | Enterprise Linux For Real Time | 8 | — |
| Redhat | Enterprise Linux Server | 6.0 | — |
| Redhat | Enterprise Linux Server | 7.0 | — |
| Redhat | Enterprise Linux Server Aus | 7.7 | — |
| Redhat | Enterprise Linux Server Tus | 7.7 | — |
| Redhat | Enterprise Linux Workstation | 6.0 | — |
| Redhat | Enterprise Linux Workstation | 7.0 | — |
| Canonical | Ubuntu Linux | 14.04 | — |
| Canonical | Ubuntu Linux | 16.04 | — |
| Canonical | Ubuntu Linux | 18.04 | — |
| Canonical | Ubuntu Linux | 19.04 | — |
| Opensuse | Leap | 15.0 | — |
| Opensuse | Leap | 15.1 | — |
| Fedoraproject | Fedora | 29 | — |
| Fedoraproject | Fedora | 30 | — |
| Debian | Debian Linux | 8.0 | — |
| Debian | Debian Linux | 9.0 | — |
| Debian | Debian Linux | 10.0 | — |
| Netapp | Aff A700s Firmware | All versions | — |
| Netapp | H300s Firmware | All versions | — |
| Netapp | H500s Firmware | All versions | — |
| Netapp | H700s Firmware | All versions | — |
| Netapp | H300e Firmware | All versions | — |
| Netapp | H500e Firmware | All versions | — |
| Netapp | H700e Firmware | All versions | — |
| Netapp | H410s Firmware | All versions | — |
| Netapp | H410c Firmware | All versions | — |
| Netapp | H610s Firmware | All versions | — |
| Netapp | Data Availability Services | All versions | — |
| Netapp | Hci Management Node | All versions | — |
| Netapp | Solidfire | All versions | — |
| Oracle | Sd-Wan Edge | 7.3 | — |
| Oracle | Sd-Wan Edge | 8.0 | — |
| Oracle | Sd-Wan Edge | 8.1 | — |
| Oracle | Sd-Wan Edge | 8.2 | — |
References
- https://lists.opensuse.org/opensuse-security-announce/2019-10/msg00036.htmlMailing List, Third Party Advisory
- https://lists.opensuse.org/opensuse-security-announce/2019-10/msg00037.htmlMailing List, Third Party Advisory
- https://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.htmlThird Party Advisory, VDB Entry
- https://packetstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.htmlThird Party Advisory, VDB Entry
- https://www.openwall.com/lists/oss-security/2019/09/20/1Mailing List, Patch, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3309Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3517Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3978Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3979Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4154Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4256Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0027Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0204Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14821Issue Tracking, Mitigation, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/09/msg00025.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/10/msg00000.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TRZQQQANZWQMPILZV7OTS3RGGRLLE2Q7/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YW3QNMPENPFEGVTOFPSNOBL7JEIJS25P/Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Nov/11Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Sep/41Issue Tracking, Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20191004-0001/Third Party Advisory
- https://usn.ubuntu.com/4157-1/Third Party Advisory
- https://usn.ubuntu.com/4157-2/Third Party Advisory
- https://usn.ubuntu.com/4162-1/Third Party Advisory
- https://usn.ubuntu.com/4162-2/Third Party Advisory
- https://usn.ubuntu.com/4163-1/Third Party Advisory
- https://usn.ubuntu.com/4163-2/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4531Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2020.htmlThird Party Advisory
- https://lists.opensuse.org/opensuse-security-announce/2019-10/msg00036.htmlMailing List, Third Party Advisory
- https://lists.opensuse.org/opensuse-security-announce/2019-10/msg00037.htmlMailing List, Third Party Advisory
- https://packetstormsecurity.com/files/154951/Kernel-Live-Patch-Security-Notice-LSN-0058-1.htmlThird Party Advisory, VDB Entry
- https://packetstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.htmlThird Party Advisory, VDB Entry
- https://www.openwall.com/lists/oss-security/2019/09/20/1Mailing List, Patch, Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3309Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3517Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3978Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:3979Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4154Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:4256Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0027Third Party Advisory
- https://access.redhat.com/errata/RHSA-2020:0204Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14821Issue Tracking, Mitigation, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/09/msg00025.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2019/10/msg00000.htmlMailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TRZQQQANZWQMPILZV7OTS3RGGRLLE2Q7/Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YW3QNMPENPFEGVTOFPSNOBL7JEIJS25P/Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Nov/11Mailing List, Third Party Advisory
- https://seclists.org/bugtraq/2019/Sep/41Issue Tracking, Mailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20191004-0001/Third Party Advisory
- https://usn.ubuntu.com/4157-1/Third Party Advisory
- https://usn.ubuntu.com/4157-2/Third Party Advisory
- https://usn.ubuntu.com/4162-1/Third Party Advisory
- https://usn.ubuntu.com/4162-2/Third Party Advisory
- https://usn.ubuntu.com/4163-1/Third Party Advisory
- https://usn.ubuntu.com/4163-2/Third Party Advisory
- https://www.debian.org/security/2019/dsa-4531Third Party Advisory
- https://www.oracle.com/security-alerts/cpuapr2020.htmlThird Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2019-14821?
CVE-2019-14821 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.76% probability of exploitation in the next 30 days.
How do I fix CVE-2019-14821?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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