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ubuntucveUbuntu.comUB:CVE-2019-14821
HistoryOct 01, 2019 - 12:00 a.m.

CVE-2019-14821

2019-10-0100:00:00
ubuntu.com
ubuntu.com
34

8.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.001 Low

EPSS

Percentile

30.1%

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.

Bugs

Notes

Author Note
tyhicks An attacker needs write access to the /dev/kvm device file to exploit this flaw. By default, Ubuntu users don’t have privileges to write to /dev/kvm. This is true even when libvirt is installed and in use.
OSVersionArchitecturePackageVersionFilename
ubuntu18.04noarchlinux< 4.15.0-66.75UNKNOWN
ubuntu19.04noarchlinux< 5.0.0-32.34UNKNOWN
ubuntu16.04noarchlinux< 4.4.0-166.195UNKNOWN
ubuntu18.04noarchlinux-aws< 4.15.0-1052.54UNKNOWN
ubuntu19.04noarchlinux-aws< 5.0.0-1019.21UNKNOWN
ubuntu14.04noarchlinux-aws< 4.4.0-1056.60UNKNOWN
ubuntu16.04noarchlinux-aws< 4.4.0-1096.107UNKNOWN
ubuntu16.04noarchlinux-aws-hwe< 4.15.0-1052.54~16.04.1UNKNOWN
ubuntu18.04noarchlinux-azure< 5.0.0-1023.24~18.04.1UNKNOWN
ubuntu19.04noarchlinux-azure< 5.0.0-1023.24UNKNOWN
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8.8 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

7.2 High

CVSS2

Access Vector

Access Complexity

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

0.001 Low

EPSS

Percentile

30.1%