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CVE-2021-47306

kernel: net: fddi: fix UAF in fza_probe

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · May 21, 2024

Updated · November 21, 2025

Description

A vulnerability was found in the fza_probe function in the Linux kernel's FDDI driver. Private data might be used after it has been freed, leading to an use-after-free issue, causing system instability or crashes if the freed data is accessed.

Statement

This vulnerability is rated as a moderate because this issue does not directly expose sensitive information. No Red Hat products are affected.

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:N/I:N/A:H

CWE-416 · Use After Free