Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-06-26T00:00:00 kernel: idpf: fix double free and use-after-free in aux device error paths 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-364

In the Linux kernel, the following vulnerability has been resolved: idpf: fix double free and use-after-free in aux device error paths When auxiliary_device_add() fails in idpf_plug_vport_aux_dev() or idpf_plug_core_aux_dev(), the err_aux_dev_add label calls auxiliary_device_uninit() and falls through to err_aux_dev_init. The uninit call will trigger put_device(), which invokes the release callback (idpf_vport_adev_release / idpf_core_adev_release) that frees iadev. The fall-through then reads adev->id from the freed iadev for ida_free() and double-frees iadev with kfree(). Free the IDA slot and clear the back-pointer before uninit, while adev is still valid, then return immediately. Commit 65637c3a1811 ("idpf: fix UAF in RDMA core aux dev deinitialization") fixed the same use-after-free in the matching unplug path in this file but missed both probe error paths.

A flaw was found in the Linux kernel. Specifically, a double free and use-after-free vulnerability exists in the `idpf` driver's auxiliary device error paths. This flaw occurs when `auxiliary_device_add()` fails, leading to improper memory handling where memory is freed twice or accessed after being freed. This can result in system instability, denial of service (DoS), or potentially lead to arbitrary code execution.

Red Hat Enterprise Linux 10 Fix deferred kernel Red Hat Enterprise Linux 6 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel Red Hat Enterprise Linux 7 Not affected kernel-rt Red Hat Enterprise Linux 8 Not affected kernel Red Hat Enterprise Linux 8 Not affected kernel-rt Red Hat Enterprise Linux 9 Fix deferred kernel Red Hat Enterprise Linux 9 Fix deferred kernel-rt https://www.cve.org/CVERecord?id=CVE-2026-53286 https://nvd.nist.gov/vuln/detail/CVE-2026-53286 https://lore.kernel.org/linux-cve-announce/2026062616-CVE-2026-53286-b01e@gregkh/T