CVE-2025-37953

kernel: Linux kernel: sch_htb NULL pointer dereference

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 20, 2025

Updated · June 30, 2026

Description

A flaw was found in the Linux kernel's Hierarchical Token Bucket (sch_htb) scheduler. This vulnerability allows a local attacker to cause a denial of service (DoS) via a NULL pointer dereference in the htb_next_rb_node() function due to htb_deactivate() not being idempotent.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference