CVE-2026-93136 bus: mhi: ep: Fix device refcount leak in the error path of MHI device creation
A refcount leak in the Linux kernel MHI endpoint driver can cause memory exhaustion and denial of service when device creation fails.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-93136?
CVE-2026-93136 is a memory corruption vulnerability in Linux, published on 17 Sep 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:
bus: mhi: ep: Fix device refcount leak in the error path of MHI device creation
mhi_ep_create_device() takes one device reference for the UL channel and another for the DL channel after allocating the transfer device. These references are normally released by mhi_ep_destroy_device() before the device itself is removed.
If dev_set_name() or device_add() fails, the error path currently drops only one reference. The remaining channel references keep the device from being released and leave the channels associated with a device that was never registered.
Route both failures through a common unwind path that drops the DL channel reference, the UL channel reference, and the initial reference from device_initialize().
Which versions are affected by CVE-2026-93136?
How do I fix CVE-2026-93136?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-93136 being exploited?
There is no known exploitation of CVE-2026-93136 in the wild and no public exploit code.
Sources
Also known as AZL-102050, BELL-CVE-2026-93136, DEBIAN-CVE-2026-93136, GHSA-4w2p-3v8x-m8hh, UBUNTU-CVE-2026-93136.