CVE-2021-4028

Name: CVE-2021-4028
Creator: NVD / NIST
Published: 2022-08-24T16:15:09.197+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2021-4028 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

A flaw in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.30%

21.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Linux	Linux Kernel	>= 5.10, < 5.10.71	—
Linux	Linux Kernel	>= 5.11, < 5.14.10	—
Suse	Linux Enterprise	15.0	Sp3

References

https://access.redhat.com/security/cve/CVE-2021-4028Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2027201Issue Tracking, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1193167#c0Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74Mailing List, Patch, Vendor Advisory
https://lkml.org/lkml/2021/10/4/697Mailing List, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20221228-0002/Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-4028Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2027201Issue Tracking, Third Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1193167#c0Issue Tracking, Patch, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74Mailing List, Patch, Vendor Advisory
https://lkml.org/lkml/2021/10/4/697Mailing List, Patch, Vendor Advisory
https://security.netapp.com/advisory/ntap-20221228-0002/Third Party Advisory

Timeline

Published: Aug 24, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4028?

How severe is CVE-2021-4028?

CVE-2021-4028 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4028?

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-2021-4028?

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

Scan your code now

Source: NVD / NIST