CVE-2025-21645

/// Technical description

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

platform/x86/amd/pmc: Only disable IRQ1 wakeup where i8042 actually enabled it

Wakeup for IRQ1 should be disabled only in cases where i8042 had

actually enabled it, otherwise "wake_depth" for this IRQ will try to

drop below zero and there will be an unpleasant WARN() logged:

kernel: atkbd serio0: Disabling IRQ1 wakeup source to avoid platform firmware bug

kernel: ------------[ cut here ]------------

kernel: Unbalanced IRQ 1 wake disable

kernel: WARNING: CPU: 10 PID: 6431 at kernel/irq/manage.c:920 irq_set_irq_wake+0x147/0x1a0

The PMC driver uses DEFINE_SIMPLE_DEV_PM_OPS() to define its dev_pm_ops

which sets amd_pmc_suspend_handler() to the .suspend, .freeze, and

.poweroff handlers. i8042_pm_suspend(), however, is only set as

the .suspend handler.

Fix the issue by call PMC suspend handler only from the same set of

dev_pm_ops handlers as i8042_pm_suspend(), which currently means just

the .suspend handler.

To reprod

/// 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