CVE-2021-3923

Name: CVE-2021-3923
Creator: NVD / NIST
Published: 2023-03-27T21:15:09.98+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

LOWCVSS 2.3/10EPSS 0.20%

Last modified Jun 17, 2026

CVE-2021-3923 is a low-severity vulnerability rated 2.3/10 on the CVSS scale. A flaw was found in the Linux kernel's implementation of RDMA over infiniband. An attacker with a privileged local account can leak kernel stack information when issuing commands to the /dev/infiniband/rdma_cm device node. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

Description

A flaw was found in the Linux kernel's implementation of RDMA over infiniband. An attacker with a privileged local account can leak kernel stack information when issuing commands to the /dev/infiniband/rdma_cm device node. While this access is unlikely to leak sensitive user information, it can be further used to defeat existing kernel protection mechanisms.

Metrics

CVSS 3.1

2.3/10

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

EPSS Probability

0.20%

9.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	< 5.15.14
Redhat	Enterprise Linux	6.0
Redhat	Enterprise Linux	7.0
Redhat	Enterprise Linux	8.0
Fedoraproject	Fedora	37

References

https://bugzilla.redhat.com/show_bug.cgi?id=2019643Issue Tracking, Patch, Third Party Advisory
https://lore.kernel.org/all/20220204100036.GA12348%40kili/
https://bugzilla.redhat.com/show_bug.cgi?id=2019643Issue Tracking, Patch, Third Party Advisory
https://lore.kernel.org/all/20220204100036.GA12348%40kili/

Timeline

Published: Mar 27, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3923?

How severe is CVE-2021-3923?

CVE-2021-3923 has a CVSS score of 2.3/10 (LOW severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3923?

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-2021-3923?

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

Scan your code now

Source: NVD / NIST