CVE-2026-92481pinctrl: mediatek: free EINT resources on unbind

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/23252bc1cd9a58a039c9b1ae77b22d2b33da48e9
• https://git.kernel.org/stable/c/903a7cdf63a81d3738594c5bd1b5955f58fda427
• https://git.kernel.org/stable/c/51552c8c60d3b1fecc062eab2d8cfeaa1cb339dd
• https://git.kernel.org/stable/c/7f6d898179ca4771ee602bdad4246c3952af83eb
• https://git.kernel.org/stable/c/e06785cba7f86d72abd531058b1a82d6952a7346
• https://git.kernel.org/stable/c/88292b7103d260e3e606eb3bb2794060a5fde48e