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Vulnerability record · public intelligence
CVE-2023-4623
HIGH
Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component
Published Sep 6, 2023 · Updated Oct 23, 2026
Severity · CVSSHIGH · 7.8
Known exploitationNot listed
EPSS / likelihood0.28%
QFinch risk score10 / 100
Original summary
Normalized public record · Updated Oct 23, 2026
Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
CVENVDEPSS
- SSVC priority
- MEDIUM
- Confidence
- 10%
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
- Patch commit ↗
- kernel.dance ↗
- lists.debian.org ↗
- packetstormsecurity.com ↗
- lists.debian.org ↗
- cert-portal.siemens.com ↗
- cert-portal.siemens.com ↗
- cert-portal.siemens.com ↗
Record history
Published Sep 6, 2023 · Last refreshed Oct 23, 2026