CVE-2026-80751 pmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev()
An uninitialized pointer in the MediaTek MFG power domain driver can cause a kernel crash or logic error during device attachment.
- 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-2026-80751?
CVE-2026-80751 is a high-severity vulnerability in Linux, published on 3 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:
pmdomain: mediatek: mfg: initialize prev_o in mtk_mfg_attach_dev()
mtk_mfg_attach_dev() reads prev_o on the first iteration of its loop, in "if (prev_o && prev_o->freq == o->freq)", before prev_o is assigned at the end of the loop body. On that first iteration, evaluating prev_o reads an indeterminate value. If it is non-NULL, the condition dereferences a stale or invalid pointer, potentially faulting or incorrectly skipping the first OPP.
Initialize prev_o to NULL. This matches the intent as well: there is no previous OPP to compare against on the first iteration.
Found with Clang's -Wconditional-uninitialized.
Which versions are affected by CVE-2026-80751?
How do I fix CVE-2026-80751?
Apply the vendor's patch.
Is CVE-2026-80751 being exploited?
There is no known exploitation of CVE-2026-80751 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-80751, GHSA-3f8w-94vm-5g9p, UBUNTU-CVE-2026-80751.