Linux Kernel up to 7.1.8 bnge bnge_aux_dev_release null pointer dereference

Summaryinfo

A vulnerability has been found in Linux Kernel up to 7.1.8 and classified as problematic. This affects the function bnge_aux_dev_release of the component bnge. This manipulation causes null pointer dereference. This vulnerability is registered as CVE-2026-74706. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.8. It has been declared as problematic. Affected by this vulnerability is the function bnge_aux_dev_release of the component bnge. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: bnge: Fix NULL pointer dereference in aux device release If allocation of auxr_dev fails during auxiliary device setup, the error path calls auxiliary_device_uninit(), which eventually invokes bnge_aux_dev_release(). The release callback unconditionally dereferences aux_priv->auxr_dev->pdev to retrieve the parent bnge_dev. Since auxr_dev has not yet been allocated on this failure path, the dereference results in a NULL pointer exception Retrieve the parent bnge_dev from the auxiliary device's parent instead of auxr_dev, and free auxr_dev only when it was successfully allocated. This allows the release callback to correctly clean up partially initialized auxiliary devices.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-74706 since 08/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation requires an enhanced level of successful authentication. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 7.1.9 eliminates this vulnerability. Applying the patch 83ef2f3cab7fe6dd9155cd598dc64be524d963a9/1cb4298810e27e037d3ca07286ecbb97e89ba58d is able to eliminate this problem.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.1.0
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.4
• 7.1.5
• 7.1.6
• 7.1.7
• 7.1.8

License

• open-source

Website

• Vendor: https://www.kernel.org/

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