CVE-2024-50196

/// Technical description

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

pinctrl: ocelot: fix system hang on level based interrupts

The current implementation only calls chained_irq_enter() and

chained_irq_exit() if it detects pending interrupts.

```

for (i = 0; i < info->stride; i++) {

uregmap_read(info->map, id_reg + 4 * i, &reg);

if (!reg)

continue;

chained_irq_enter(parent_chip, desc);

```

However, in case of GPIO pin configured in level mode and the parent

controller configured in edge mode, GPIO interrupt might be lowered by the

hardware. In the result, if the interrupt is short enough, the parent

interrupt is still pending while the GPIO interrupt is cleared;

chained_irq_enter() never gets called and the system hangs trying to

service the parent interrupt.

Moving chained_irq_enter() and chained_irq_exit() outside the for loop

ensures that they are called even when GPIO interrupt is lowered by the

hardware.

The similar code with chained_irq_enter() / chained_irq_exit() fun

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References