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CVE-2021-47595

kernel: net/sched: sch_ets: don't remove idle classes from the round-robin list

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Severity

Moderate

Red Hat Product Security

5.6

CVSS 3.1

Review impact separately from score.

Published · June 19, 2024

Updated · November 21, 2025

Description

A vulnerability was found in the Linux kernel's net/sched component in the sch_ets.c file, where idle classes were incorrectly removed from the round-robin list. This issue arises when the queue length is not properly checked, potentially leading to a use-after-free situation in net/sched that results in kernel crashes.

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

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS / CWE

CVSS 3.1 · 5.6
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:H

CWE-787 · Out-of-bounds Write