CVE-2021-33630: NULL-ptr-deref in network sched

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-01-18 · updated 2026-06-17
Weakness: CWE-476

Description

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.

Affected products

Openatom Openeuler: from 4.19.90 before 4.19.90-2401.3 — fixed in 4.19.90-2401.3

How to fix

Upgrade to a fixed version: Openatom Openeuler 4.19.90-2401.3. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2024/01/30/10
http://www.openwall.com/lists/oss-security/2024/01/30/3
http://www.openwall.com/lists/oss-security/2024/01/30/4
http://www.openwall.com/lists/oss-security/2024/01/30/5
http://www.openwall.com/lists/oss-security/2024/01/30/9
http://www.openwall.com/lists/oss-security/2024/01/31/2
http://www.openwall.com/lists/oss-security/2024/01/31/3
http://www.openwall.com/lists/oss-security/2024/02/02/6
http://www.openwall.com/lists/oss-security/2024/02/02/9
http://www.openwall.com/lists/oss-security/2024/02/03/1
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3e8b9bfa110896f95d602d8c98d5f9d67e41d78c
https://gitee.com/src-openeuler/kernel/pulls/1389

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