Medium [CVE-2026-74706] Fix NULL pointer dereference in aux device release

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.

During the setup of an auxiliary device, if the allocation of a specific resource (`auxr_dev`) fails, the subsequent release process attempts to access an unallocated memory region. This results in a NULL pointer dereference, which can lead to a system crash, causing a Denial of Service (DoS).

Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-476.

Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.