CVE-2021-3764

Name: CVE-2021-3764
Creator: NVD / NIST
Published: 2022-08-23T16:15:09.837+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2021-3764 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A memory leak flaw was found in the Linux kernel's ccp_run_aes_gcm_cmd() function that allows an attacker to cause a denial of service. The vulnerability is similar to the older CVE-2019-18808. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

Description

A memory leak flaw was found in the Linux kernel's ccp_run_aes_gcm_cmd() function that allows an attacker to cause a denial of service. The vulnerability is similar to the older CVE-2019-18808. The highest threat from this vulnerability is to system availability.

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

0.26%

17.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	<= 5.14.20
Linux	Linux Kernel	5.15

References

https://access.redhat.com/security/cve/CVE-2021-3764Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1997467Issue Tracking, Third Party Advisory
https://github.com/torvalds/linux/commit/505d9dcb0f7ddf9d075e729523a33d38642ae680Patch, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2021-3764Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3764Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1997467Issue Tracking, Third Party Advisory
https://github.com/torvalds/linux/commit/505d9dcb0f7ddf9d075e729523a33d38642ae680Patch, Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2021-3764Third Party Advisory

Timeline

Published: Aug 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3764?

How severe is CVE-2021-3764?

CVE-2021-3764 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3764?

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-2021-3764?

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

Scan your code now

Source: NVD / NIST