CVE-2021-3764 Denial of service in Linux Kernel

What is CVE-2021-3764?

CVE-2021-3764 is a medium-severity denial of service vulnerability in Linux kernel, published on 23 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-401, CWE-400

Which versions are affected by CVE-2021-3764?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-3764?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-3764 being exploited?

There is no known exploitation of CVE-2021-3764 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• How this page is made

Also known as DEBIAN-CVE-2021-3764, UBUNTU-CVE-2021-3764.