VDB-171640 · CVE-2021-3444 · GCVE-0-2021-3444

Linux Kernel up to 5.4.100/5.10.18/5.11.1 bpf Verifier out-of-bounds write

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.
8.0	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.4.100/5.10.18/5.11.1. The impacted element is an unknown function of the component bpf Verifier. Executing a manipulation can lead to out-of-bounds write. This vulnerability is registered as CVE-2021-3444. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.4.100/5.10.18/5.11.1 (Operating System). This vulnerability affects an unknown function of the component bpf Verifier. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 03/24/2021. The advisory is shared for download at openwall.com. This vulnerability was named CVE-2021-3444. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 04/04/2021).

Upgrading to version 5.4.101, 5.10.19 or 5.11.2 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

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: 8.3
VulDB Meta Temp Score: 8.1

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Out-of-bounds write
CWE: CWE-787 / CWE-119
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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.4.101/5.10.19/5.11.2
Patch: git.kernel.org

Timelineinfo

03/16/2021 🔍
03/24/2021 +8 days 🔍
03/24/2021 +0 days 🔍
04/04/2021 +11 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: openwall.com
Status: Confirmed

CVE: CVE-2021-3444 (🔍)
GCVE (CVE): GCVE-0-2021-3444
GCVE (VulDB): GCVE-100-171640

Entryinfo

Created: 03/24/2021 11:32
Updated: 04/04/2021 12:56
Changes: 03/24/2021 11:32 (41), 04/04/2021 12:52 (5), 04/04/2021 12:56 (19)
Complete: 🔍
Cache ID: 216::103