CVE-2026-53286 idpf: fix double free and use-after-free in aux device error paths
A use-after-free and double-free vulnerability in the Linux kernel idpf driver allows attackers to cause denial of service or execute arbitrary code.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-53286?
CVE-2026-53286 is a high-severity use after free vulnerability in Linux kernel, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-415
Which versions are affected by CVE-2026-53286?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53286?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-53286 being exploited?
There is no known exploitation of CVE-2026-53286 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-53286, DEBIAN-CVE-2026-53286, GHSA-xv2m-p78g-cm3m, UBUNTU-CVE-2026-53286.