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Vulnerability record · CVE-2021-4028 · published 24 August 2022

CVE-2021-4028: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.32% · top 74.9% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.32%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2021-4028 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2027201 Issue TrackingThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1193167#c0 Issue TrackingPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74 Mailing ListPatchVendor Advisory
https://lkml.org/lkml/2021/10/4/697 Mailing ListPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20221228-0002/ Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-4028 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2027201 Issue TrackingThird Party Advisory
https://bugzilla.suse.com/show_bug.cgi?id=1193167#c0 Issue TrackingPatchThird Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74 Mailing ListPatchVendor Advisory
https://lkml.org/lkml/2021/10/4/697 Mailing ListPatchVendor Advisory
https://security.netapp.com/advisory/ntap-20221228-0002/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-4028), CISA KEV, FIRST EPSS (scores of 2026-11-14). This page is refreshed as NVD updates the record.