What is CVE-2021-33630?

CVE-2021-33630 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a NULL Pointer Dereference flaw (CWE-476). CVE-2021-33630 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-33630?

CVE-2021-33630 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-33630?

No patch is currently available for CVE-2021-33630. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-33630 actively exploited?

CVE-2021-33630 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/476.html

CVE-2021-33630

Medium

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.

Package Linux Kernel

Published 2024-01-18

Last modified 2025-04-02

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-476

CVE-2021-33630 is a NULL Pointer Dereference vulnerability

What is NULL Pointer Dereference?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-33630 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Openwall
http://www.openwall.com/lists/oss-security/2024/01/30/10
Openwall
http://www.openwall.com/lists/oss-security/2024/01/30/3
Openwall
http://www.openwall.com/lists/oss-security/2024/01/30/4
Openwall
http://www.openwall.com/lists/oss-security/2024/01/30/5
Openwall
http://www.openwall.com/lists/oss-security/2024/01/30/9
Openwall
http://www.openwall.com/lists/oss-security/2024/01/31/2
Openwall
http://www.openwall.com/lists/oss-security/2024/01/31/3
Openwall
http://www.openwall.com/lists/oss-security/2024/02/02/6
Openwall
http://www.openwall.com/lists/oss-security/2024/02/02/9
Openwall
http://www.openwall.com/lists/oss-security/2024/02/03/1
Gitee
https://gitee.com/src-openeuler/kernel/pulls/1389

Release Notes
Debian Security
https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Openeuler
https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1030

Vendor Advisory
Openeuler
https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-1031

Vendor Advisory
Kernel patch commit
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e8b9bfa110896f95d602d8c98d5f9d67e41d78c
Patch

Details

CVE ID CVE-2021-33630

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-01-18

Modified 2025-04-02

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-33630?

CVE-2021-33630 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as a NULL Pointer Dereference flaw (CWE-476) . CVE-2021-33630 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-33630?

CVE-2021-33630 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-33630?

No patch is currently available for CVE-2021-33630. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-33630 actively exploited?

No — CVE-2021-33630 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is NULL Pointer Dereference (CWE-476)?

The product dereferences a pointer that it expects to be valid but is NULL, typically causing a crash. View CWE-476 on MITRE CWE →