🛡️ AZL-66935 — kernel

CVE-2025-39685 affecting package kernel for versions less than 6.6.104.2-1

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

comedi: pcl726: Prevent invalid irq number

The reproducer passed in an irq number(0x80008000) that was too large,

which triggered the oob.

Added an interrupt number check to prevent users from passing in an irq

number that was too large.

If it->options[1] is 31, then 1 << it->options[1] is still invalid

because it shifts a 1-bit into the sign bit (which is UB in C).

Possible solutions include reducing the upper bound on the

it->options[1] value to 30 or lower, or using 1U << it->options[1].

The old code would just not attempt to request the IRQ if the

options[1] value were invalid. And it would still configure the

device without interrupts even if the call to request_irq returned an

error. So it would be better to combine this test with the test below.