CVE-2018-20124

Name: CVE-2018-20124
Creator: NVD / NIST
Published: 2018-12-20T23:29:02.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2018-20124 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. hw/rdma/rdma_backend.c in QEMU allows guest OS users to trigger out-of-bounds access via a PvrdmaSqWqe ring element with a large num_sge value.. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

Description

hw/rdma/rdma_backend.c in QEMU allows guest OS users to trigger out-of-bounds access via a PvrdmaSqWqe ring element with a large num_sge value.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.49%

38.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

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

References

http://www.openwall.com/lists/oss-security/2018/12/18/2Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/106290Third Party Advisory, VDB Entry
https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02822.htmlPatch, Third Party Advisory
https://usn.ubuntu.com/3923-1/Third Party Advisory
http://www.openwall.com/lists/oss-security/2018/12/18/2Mailing List, Patch, Third Party Advisory
http://www.securityfocus.com/bid/106290Third Party Advisory, VDB Entry
https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02822.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-2018-20124?

hw/rdma/rdma_backend.c in QEMU allows guest OS users to trigger out-of-bounds access via a PvrdmaSqWqe ring element with a large num_sge value.

How severe is CVE-2018-20124?

CVE-2018-20124 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2018-20124?

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-2018-20124?

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

Scan your code now

Source: NVD / NIST