Null Dereference Vulnerability in s390/qeth Package

Kernel Updated 02 Oct 2025

Summary

19/10/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1001755: s390/qeth: fix NULL deref in qeth_clear_working_pool_list(). Affects Kernel versions >= eff73e16ee116f6eafa2be48fab42659a27cb453, < 9b00fb12cdc9d8d1c3ffe82a78e74738127803fc. No fix is published. How to fix ↓

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Background

The s390/qeth package is a component of the Linux Kernel that provides support for the IBM System z network devices. It enables communication between the mainframe and external networks. The package includes drivers and utilities for managing the qeth network devices. These devices are used for connecting mainframes to Ethernet networks. The s390/qeth package is an integral part of the Linux Kernel and is widely used in mainframe environments.

Vulnerability Detail

The identified vulnerability in the s390/qeth package is a null dereference issue that occurs in the qeth_clear_working_pool_list() function. This vulnerability was introduced in version v5.9 of the Linux Kernel by commit eff73e16ee116f6eafa2be48fab42659a27cb453 and has been fixed in version v5.14.9 by commit 9b00fb12cdc9d8d1c3ffe82a78e74738127803fc. A null dereference occurs when a program attempts to access or manipulate a null pointer, leading to a crash or potential code execution. In the case of this vulnerability, the null dereference occurs in the qeth_clear_working_pool_list() function, which could be triggered by a specific sequence of operations or inputs. Exploiting this vulnerability could potentially lead to a denial of service (DoS) condition or arbitrary code execution.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

As this vulnerability has been fixed in the Linux Kernel version v5.14.9, there is no specific workaround available. It is recommended to update to the fixed version as soon as possible.

Conclusion

The null dereference vulnerability in the s390/qeth package can be mitigated by updating the Linux Kernel to version v5.14.9 or later. It is crucial to promptly apply the fix to prevent potential denial of service or code execution attacks. For further assistance or support in addressing this vulnerability, please contact DevNack.com.

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