Linux Kernel up to 5.15.2 Bluetooth Subsystem lock_sock_nested use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.15.2. This affects the function lock_sock_nested of the component Bluetooth Subsystem. Such manipulation leads to use after free. This vulnerability is documented as CVE-2021-3752. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.15.2 (Operating System). It has been rated as critical. Affected by this issue is the function lock_sock_nested of the component Bluetooth Subsystem. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability.

The weakness was released 02/17/2022. The advisory is shared for download at bugzilla.redhat.com. This vulnerability is handled as CVE-2021-3752 since 08/31/2021. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/17/2022).

Upgrading to version 5.15.3 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at lore.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

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 8.4

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

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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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: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.15.3
Patch: lore.kernel.org

Timelineinfo

08/31/2021 🔍
02/17/2022 +170 days 🔍
02/17/2022 +0 days 🔍
02/19/2022 +2 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: bugzilla.redhat.com
Status: Confirmed

CVE: CVE-2021-3752 (🔍)
GCVE (CVE): GCVE-0-2021-3752
GCVE (VulDB): GCVE-100-193256

Entryinfo

Created: 02/17/2022 07:44
Updated: 02/19/2022 09:34
Changes: 02/17/2022 07:44 (42), 02/19/2022 09:32 (1), 02/19/2022 09:34 (1)
Complete: 🔍
Cache ID: 216::103

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