CVE-2025-21645

Vulnerability 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 reproduce this issue try hibernating (S4) the machine after a fresh boot without putting it into s2idle first. [ij: edited the commit message.]

CVSS Score

Affected Products

References

• https://git.kernel.org/stable/c/5cc621085e2b7a9b1905a98f8e5a86bb4aea2016Patch
• https://git.kernel.org/stable/c/ab47d72b736e78d3c2370b26e0bfc46eb0918391Patch
• https://git.kernel.org/stable/c/b25778c87a6bce40c31e92364f08aa6240309e25Patch
• https://git.kernel.org/stable/c/dd410d784402c5775f66faf8b624e85e41c38aafPatch
• https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html