openEuler Kernel prior 4.19.90-2401.3 on Linux Network net/sched/sch_cbs.C null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in openEuler Kernel on Linux. The affected element is an unknown function of the file net/sched/sch_cbs.C of the component Network Module. The manipulation results in null pointer dereference. This vulnerability is identified as CVE-2021-33630. The attack is only possible with local access. There is not any exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in openEuler Kernel on Linux. It has been classified as problematic. Affected is an unknown code block of the file net/sched/sch_cbs.C of the component Network Module. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. CVE summarizes:

NULL Pointer Dereference vulnerability in openEuler kernel on Linux (network modules) allows Pointer Manipulation. This vulnerability is associated with program files net/sched/sch_cbs.C. This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3.

The weakness was released 01/18/2024. The advisory is available at gitee.com. This vulnerability is traded as CVE-2021-33630 since 05/28/2021. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 249868 (Linux Distros Unpatched Vulnerability : CVE-2021-33630), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.19.90-2401.3 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (249868). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CNA Base Score: 5.5
CNA Vector (openEuler): 🔍

CVSSv2info

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

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
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: 249868
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2021-33630

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.19.90-2401.3
Patch: git.kernel.org

Timelineinfo

05/28/2021 🔍
01/18/2024 +965 days 🔍
01/18/2024 +0 days 🔍
08/18/2025 +578 days 🔍

Sourcesinfo

Advisory: gitee.com
Status: Confirmed

CVE: CVE-2021-33630 (🔍)
GCVE (CVE): GCVE-0-2021-33630
GCVE (VulDB): GCVE-100-251466

Entryinfo

Created: 01/18/2024 18:00
Updated: 08/18/2025 05:14
Changes: 01/18/2024 18:00 (51), 02/12/2024 11:37 (1), 06/27/2024 19:19 (24), 08/18/2025 05:14 (3)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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