high
8.8
CWE
787
Advisory Published
CVE Published
CVE Published
Updated

CVE-2019-14821

First published: Thu Aug 29 2019(Updated: )

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.

Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/kernel<0:2.6.32-754.25.1.el6
0:2.6.32-754.25.1.el6
redhat/kernel-rt<0:3.10.0-1062.7.1.rt56.1030.el7
0:3.10.0-1062.7.1.rt56.1030.el7
redhat/kernel<0:3.10.0-1062.7.1.el7
0:3.10.0-1062.7.1.el7
redhat/kernel-alt<0:4.14.0-115.16.1.el7a
0:4.14.0-115.16.1.el7a
redhat/kernel<0:3.10.0-957.56.1.el7
0:3.10.0-957.56.1.el7
redhat/kernel-rt<0:4.18.0-147.rt24.93.el8
0:4.18.0-147.rt24.93.el8
redhat/kernel<0:4.18.0-147.el8
0:4.18.0-147.el8
redhat/kernel<0:4.18.0-80.15.1.el8_0
0:4.18.0-80.15.1.el8_0
Linux Kernel>=2.6.27<=3.15.10
Linux Kernel>=3.16<3.16.74
Linux Kernel>=4.4<4.4.194
Linux Kernel>=4.9<4.9.194
Linux Kernel>=4.14<4.14.146
Linux Kernel>=4.19<4.19.75
Linux Kernel>=5.2<5.2.17
Linux Kernel>=5.3<5.3.1
Linux Kernel=5.4-rc1
Red Hat Virtualization Host EUS=4.0
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux Desktop=6.0
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux Server EUS=7.7
Red Hat Enterprise Linux for Real Time=7
Red Hat Enterprise Linux for Real Time=8
Red Hat Enterprise Linux Server=6.0
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Server=7.7
Red Hat Enterprise Linux Workstation=6.0
Red Hat Enterprise Linux Workstation=7.0
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=19.04
SUSE Linux=15.0
SUSE Linux=15.1
Red Hat Fedora=29
Red Hat Fedora=30
Debian Linux=8.0
Debian Linux=9.0
Debian Linux=10.0
All of
NetApp A700 Firmware
NetApp AFF A700s Firmware
All of
NetApp H300S Firmware
NetApp H300S Firmware
All of
NetApp H500e Firmware
NetApp H500e Firmware
All of
NetApp H700S
NetApp H700S
All of
NetApp H300E
NetApp H300E Firmware
All of
NetApp H500S Firmware
NetApp H500e Firmware
All of
NetApp H700E
NetApp H700E
All of
NetApp H410S
NetApp H410S Firmware
All of
NetApp H410C
NetApp H410C Firmware
All of
NetApp HCI H610S Firmware
NetApp H610S Firmware
NetApp Data Availability Services
NetApp SolidFire & HCI Management Node
NetApp SolidFire & HCI Storage Node
Oracle SD-WAN Edge=7.3
Oracle SD-WAN Edge=8.0
Oracle SD-WAN Edge=8.1
Oracle SD-WAN Edge=8.2
NetApp A700 Firmware
NetApp AFF A700s Firmware
NetApp H300S Firmware
NetApp H300S Firmware
NetApp H500e Firmware
NetApp H500e Firmware
NetApp H700S
NetApp H700S
NetApp H300E
NetApp H300E Firmware
NetApp H500S Firmware
NetApp H500e Firmware
NetApp H700E
NetApp H700E
NetApp H410S
NetApp H410S Firmware
NetApp H410C
NetApp H410C Firmware
NetApp HCI H610S Firmware
NetApp H610S Firmware
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.133-1
6.12.21-1
6.12.22-1

Remedy

Restrict access to the '/dev/kvm' device to trusted users.

Remedy

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

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14821

Remedy

Ensure that untrusted users cannot write to the /dev/kvm device

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2019-14821?

    CVE-2019-14821 is rated as high severity based on its impact on the security and stability of the Linux kernel.

  • How do I fix CVE-2019-14821?

    To fix CVE-2019-14821, you should upgrade to a patched version of the kernel that addresses this vulnerability.

  • Which Linux kernel versions are affected by CVE-2019-14821?

    CVE-2019-14821 affects all versions of the Linux kernel up to 5.3.

  • Is CVE-2019-14821 exploitable remotely?

    CVE-2019-14821 may be exploited locally, but it is not typically considered a remote attack vulnerability.

  • What components of the Linux kernel are impacted by CVE-2019-14821?

    CVE-2019-14821 specifically impacts the KVM hypervisor within the Linux kernel, particularly in its handling of Coalesced MMIO write operations.

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