CVE-2026-64358 media: mtk-jpeg: cancel workqueue on release for supported platforms only
A null pointer dereference in the MediaTek JPEG driver causes kernel warnings and potential instability when releasing resources on unsupported platforms.
- 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-2026-64358?
CVE-2026-64358 is a medium-severity vulnerability in Linux kernel, published on 25 Jul 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:
media: mtk-jpeg: cancel workqueue on release for supported platforms only
Since a recent fix the mtk_jpeg_release function cancels any pending or running work present in the driver workqueue using cancel_work_sync function. Currently, only the multicore based variants use this workqueue and they have the jpeg_worker platform data field initialized with a workqueue callback function. For the others, this field value remain NULL by default. The cancel_work_sync function is unconditionally called in mtk_jpeg_release function, even for the variants that do not use the workqueue. This call generates a WARN_ON print in __flush_work because the workqueue callback function presence check fails in __flush_work function (used by cancel_work_sync).
So, to avoid these warnings, call cancel_work_sync only if a workqueue callback is defined in platform data.
Weakness: CWE-476
Which versions are affected by CVE-2026-64358?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64358?
Apply the vendor's patch.
Is CVE-2026-64358 being exploited?
There is no known exploitation of CVE-2026-64358 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64358, DEBIAN-CVE-2026-64358, GHSA-cj8f-pj7x-5x2c, ROOT-OS-UBUNTU-2204-CVE-2026-64358, UBUNTU-CVE-2026-64358.