NuytsTech Security

CVE-2026-23446

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

net: usb: aqc111: Do not perform PM inside suspend callback

syzbot reports “task hung in rpm_resume”

This is caused by aqc111_suspend calling
the PM variant of its write_cmd routine.

The simplified call trace looks like this:

rpm_suspend()
usb_suspend_both() – here udev->dev.power.runtime_status == RPM_SUSPENDING
aqc111_suspend() – called for the usb device interface
aqc111_write32_cmd()
usb_autopm_get_interface()
pm_runtime_resume_and_get()
rpm_resume() – here we call rpm_resume() on our parent
rpm_resume() – Here we wait for a status change that will never happen.

At this point we block another task which holds
rtnl_lock and locks up the whole networking stack.

Fix this by replacing the write_cmd calls with their _nopm variants

More information : https://git.kernel.org/stable/c/069c8f5aebe4d5224cf62acc7d4b3486091c658a

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