VDB-207024 · CVE-2021-3764 · Nessus 235794

Linux Kernel ccp-ops.c ccp_run_aes_gcm_cmd memory leak

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.9	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Linux Kernel. It has been declared as problematic. This issue affects the function ccp_run_aes_gcm_cmd of the file drivers/crypto/ccp/ccp-ops.c. The manipulation results in memory leak. This vulnerability is cataloged as CVE-2021-3764. The attack may be launched remotely. There is no exploit available. Applying a patch is advised to resolve this issue.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System) (version now known). It has been classified as critical. Affected is the function ccp_run_aes_gcm_cmd of the file drivers/crypto/ccp/ccp-ops.c. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. CVE summarizes:

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.

The weakness was shared 08/24/2022. The advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2021-3764 since 09/03/2021. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 235794 (Amazon Linux 2 : kernel (ALASKERNEL-5.4-2025-099)), which helps to determine the existence of the flaw in a target environment.

Applying the patch 505d9dcb0f7ddf9d075e729523a33d38642ae680 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (235794). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

License

open-source

Website

Vendor: https://www.kernel.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 235794
Nessus Name: Amazon Linux 2 : kernel (ALASKERNEL-5.4-2025-099)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 505d9dcb0f7ddf9d075e729523a33d38642ae680

Timelineinfo

09/03/2021 🔍
08/24/2022 +355 days 🔍
08/24/2022 +0 days 🔍
05/13/2025 +993 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 505d9dcb0f7ddf9d075e729523a33d38642ae680
Status: Confirmed

CVE: CVE-2021-3764 (🔍)
GCVE (CVE): GCVE-0-2021-3764
GCVE (VulDB): GCVE-100-207024

Entryinfo

Created: 08/24/2022 07:44
Updated: 05/13/2025 19:11
Changes: 08/24/2022 07:44 (42), 09/25/2022 07:39 (1), 09/25/2022 07:45 (11), 05/13/2025 19:11 (16)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.