CVE-2026-89942

Status: UPDATED  |  Advisory ID: CVE-2026-89942

Key Details

Affected Products, Subsystems & Sectors

What to Know

In the Linux kernel, the following vulnerability has been resolved:

iio: buffer: Fix potential use-after-free in anonymous buffer release

An anonymous buffer handle holds a reference to the underlying IIO device.

The reference is dropped in the buffer handle's release function. If the

device has been removed, either through unbind or hot-unplug, the buffer

handle might hold the last reference.

The release function takes the mutex for the buffer using a guard, which

means the unlock happens after all the code in the function, including

`iio_device_put()`. If the anonymous buffer holds the last reference this

might free both the IIO device and the buffer, which contains the mutex,

leading to use-after-free when the mutex is unlocked.

Fix this by using a scoped guard just around the buffer dmabuf list access,

making sure the mutex is unlocked before releasing the IIO device.

Version 10 of the patch that introduced this issue used this exact scheme

of first unlocking and then dropping the reference [1]. During review it

was suggested to use a guard instead, and version 11 made that change [2]. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References