CVE-2021-47125

kernel: sch_htb: fix refcount leak in htb_parent_to_leaf_offload

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · March 15, 2024

Updated · November 21, 2025

Description

A vulnerability was found in the Linux kernel. The sch_htb component caused reference count leaks due to inconsistent handling of NULL pointers, leading to mismatched queue pointers.

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

Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible.

CVSS / CWE

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

CWE-402 · Transmission of Private Resources into a New Sphere ('Resource Leak')