CVE-2026-92481 pinctrl: mediatek: free EINT resources on unbind
A use-after-free vulnerability in the MediaTek pinctrl driver allows local attackers with module loading privileges to execute arbitrary code or cause a system crash.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-92481?
CVE-2026-92481 is an use after free 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:
pinctrl: mediatek: free EINT resources on unbind
mtk_eint_do_init() creates an IRQ domain, populates it with a mapping for every EINT line and installs a chained handler on the parent interrupt, but none of these are ever released. This was harmless while the drivers were built-in, but now that they can be built as modules and unbound/rmmod'd it leaves behind a dangling IRQ domain, interrupt mappings whose chip data points at freed memory, and a chained handler that keeps firing into that freed data.
The plain allocations in mtk_eint_do_init() already use the device-managed devm_*() helpers, so tear the remaining resources down the same way: register a devm action that detaches the chained handler, waits for any in-flight handler to finish, disposes of the per-line mappings and removes the IRQ domain. This mirrors the device-managed lifecycle adopted for the GPIO chip and keeps the whole EINT setup self-cleaning on unbind.
Which versions are affected by CVE-2026-92481?
How do I fix CVE-2026-92481?
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-2026-92481 being exploited?
There is no known exploitation of CVE-2026-92481 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-92481, DEBIAN-CVE-2026-92481, GHSA-fmh8-wm6j-9mrf, UBUNTU-CVE-2026-92481.