Linux Kernel up to 5.12.1 NFC Socket use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 5.12.1. This impacts an unknown function of the component NFC Socket Handler. This manipulation causes use after free. This vulnerability is tracked as CVE-2021-23134. The attack is restricted to local execution. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.12.1 (Operating System). Affected by this vulnerability is an unknown code of the component NFC Socket Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 05/13/2021. The advisory is shared at openwall.com. This vulnerability is known as CVE-2021-23134. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 269076 (Unity Linux 20.1070a Security Update: kernel (UTSA-2025-986468)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.12.2 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.

The vulnerability is also documented in the vulnerability database at Tenable (269076). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.8
VulDB Meta Temp Score: 7.5

VulDB Base Score: 7.8
VulDB Temp Score: 7.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 269076
Nessus Name: Unity Linux 20.1070a Security Update: kernel (UTSA-2025-986468)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.12.2
Patch: git.kernel.org

Timelineinfo

01/06/2021 🔍
05/13/2021 +126 days 🔍
05/13/2021 +0 days 🔍
10/08/2025 +1609 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: openwall.com
Status: Confirmed

CVE: CVE-2021-23134 (🔍)
GCVE (CVE): GCVE-0-2021-23134
GCVE (VulDB): GCVE-100-174997

Entryinfo

Created: 05/13/2021 06:47
Updated: 10/08/2025 06:18
Changes: 05/13/2021 06:47 (41), 05/15/2021 18:09 (5), 05/15/2021 18:16 (1), 10/08/2025 06:18 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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