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TI-2021-13004 Aliases CVE-2021-33630GHSA-4mwf-4888-4x35

NULL-ptr-deref in network sched

Priority LOW 25CWE-476Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 4 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00341 27th percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 4 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

No affected products listed by the sources yet.

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:openatom:openeuler:*:*:*:*:-:*:*:*4.19.90 to before 4.19.90-2401.3VulnerableOpenatom
  • cpe:2.3:o:openatom:openeuler:*:*:*:*:-:*:*:* Versions 4.19.90 to before 4.19.90-2401.3 Vulnerable ·Openatom

Remediation

Red Hat 2 advisories

  • RHSA-2020:1769 Released 2020-04-28 · Red Hat rating Important
    kernel security, bug fix, and enhancement update
    • Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-193.el8
    • Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-193.el8, kernel-4.18.0-193.el8, kernel-abi-whitelists-4.18.0-193.el8 +19
  • RHSA-2020:1567 Released 2020-04-28 · Red Hat rating Important
    kernel-rt security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-193.rt13.51.el8, kernel-rt-core-4.18.0-193.rt13.51.el8, kernel-rt-debug-4.18.0-193.rt13.51.el8 +7
    • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-193.rt13.51.el8, kernel-rt-core-4.18.0-193.rt13.51.el8, kernel-rt-debug-4.18.0-193.rt13.51.el8 +9

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2020:1769
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2020:1769
Red Hat Enterprise Linux Real Time (v. 8)Fixed RHSA-2020:1567
Red Hat Enterprise Linux Real Time for NFV (v. 8)Fixed RHSA-2020:1567
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-33630
  2. 2026-10-03 Alias added: GHSA-4mwf-4888-4x35

References

Advisory 2

Other 13

  • TI-2024-16407 Remote command execution in A-Tune-Collector CVSS 3.1HIGH 8.1
  • TI-2025-22539 The giflib open-source component has a buffer overflow vulnerability CVSS 3.1HIGH 7.3
  • TI-2021-13009 Pull malicious images may cause process to be hijacked CVSS 3.1CRITICAL 9.8
  • TI-2021-13014 Use after free in openEuler 22.03 LTS CVSS 3.1CRITICAL 9.8
  • TI-2024-16404 Command injection in ioprobe of gala-gopher CVSS 3.1HIGH 7.8
  • TI-2024-16409 Command injection in aops-zeus CVSS 3.1HIGH 7.2
See all 20 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences