CVE-2018-20191

Name: CVE-2018-20191
Creator: NVD / NIST
Published: 2018-12-20T23:29:02.223+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.72%

Last modified Jun 17, 2026

CVE-2018-20191 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. hw/rdma/vmw/pvrdma_main.c in QEMU does not implement a read operation (such as uar_read by analogy to uar_write), which allows attackers to cause a denial of service (NULL pointer dereference).. EPSS estimates a 3.72% chance of exploitation in the next 30 days.

Description

hw/rdma/vmw/pvrdma_main.c in QEMU does not implement a read operation (such as uar_read by analogy to uar_write), which allows attackers to cause a denial of service (NULL pointer dereference).

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

3.72%

88.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-476

Affected Software

Vendor	Product	Versions
Qemu	Qemu	<= 3.1.0
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10
Fedoraproject	Fedora	29
Fedoraproject	Fedora	30

References

http://www.openwall.com/lists/oss-security/2018/12/18/1Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/106276Third Party Advisory, VDB Entry
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJMTVGDLA654HNCDGLCUEIP36SNJEKK7/
https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg03066.htmlPatch, Third Party Advisory
https://usn.ubuntu.com/3923-1/Third Party Advisory
http://www.openwall.com/lists/oss-security/2018/12/18/1Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/106276Third Party Advisory, VDB Entry
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CGCFIFSIWUREEQQOZDZFBYKWZHXCWBZN/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KJMTVGDLA654HNCDGLCUEIP36SNJEKK7/
https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg03066.htmlPatch, Third Party Advisory
https://usn.ubuntu.com/3923-1/Third Party Advisory

Timeline

Published: Dec 20, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-20191?

hw/rdma/vmw/pvrdma_main.c in QEMU does not implement a read operation (such as uar_read by analogy to uar_write), which allows attackers to cause a denial of service (NULL pointer dereference).

How severe is CVE-2018-20191?

CVE-2018-20191 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.72% probability of exploitation in the next 30 days.

How do I fix CVE-2018-20191?

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.

Are you affected by CVE-2018-20191?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST