CVE-2025-40263

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

Input: cros_ec_keyb - fix an invalid memory access

If cros_ec_keyb_register_matrix() isn't called (due to

`buttons_switches_only`) in cros_ec_keyb_probe(), `ckdev->idev` remains

NULL. An invalid memory access is observed in cros_ec_keyb_process()

when receiving an EC_MKBP_EVENT_KEY_MATRIX event in cros_ec_keyb_work()

in such case.

Unable to handle kernel read from unreadable memory at virtual address 0000000000000028

...

x3 : 0000000000000000 x2 : 0000000000000000

x1 : 0000000000000000 x0 : 0000000000000000

Call trace:

input_event

cros_ec_keyb_work

blocking_notifier_call_chain

ec_irq_thread

It's still unknown about why the kernel receives such malformed event,

in any cases, the kernel shouldn't access `ckdev->idev` and friends if

the driver doesn't intend to initialize them.