Linux Kernel up to 5.10.12 IO Request drivers/block/nbd.c nbd_add_socket use after free

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 5.10.12. This vulnerability affects the function nbd_add_socket of the file drivers/block/nbd.c of the component IO Request Handler. Performing a manipulation results in use after free. This vulnerability was named CVE-2021-3348. The attack may be initiated remotely. There is no available exploit. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.10.12 (Operating System). It has been classified as critical. This affects the function nbd_add_socket of the file drivers/block/nbd.c of the component IO Request Handler. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was presented 02/01/2021. It is possible to read the advisory at openwall.com. This vulnerability is uniquely identified as CVE-2021-3348. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 248434 (Linux Distros Unpatched Vulnerability : CVE-2021-3348), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org.

The vulnerability is also documented in the vulnerability database at Tenable (248434). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.0
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 248434
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-3348

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

02/01/2021 🔍
02/01/2021 +0 days 🔍
02/01/2021 +0 days 🔍
08/12/2025 +1653 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: openwall.com
Status: Confirmed

CVE: CVE-2021-3348 (🔍)
GCVE (CVE): GCVE-0-2021-3348
GCVE (VulDB): GCVE-100-168963

Entryinfo

Created: 02/01/2021 09:43
Updated: 08/12/2025 10:31
Changes: 02/01/2021 09:43 (42), 02/22/2021 00:13 (5), 02/22/2021 00:18 (18), 08/12/2025 10:31 (17)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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