CVE-2026-23446

Summary

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

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/cc06ac99fd78839b2d38850785731ef131d9ae26
• https://git.kernel.org/stable/c/b87f361d41f9a7f1f6c426947ca815651c481376
• https://git.kernel.org/stable/c/621f2f43741b51f62d767eb4752fbcefe2526926
• https://git.kernel.org/stable/c/4de6a43e8ecf961feabddf0e9d6911081d2ed218
• https://git.kernel.org/stable/c/3267bcb744ee8a2feabaa7ab69473f086f67fd71
• https://git.kernel.org/stable/c/d3e32a612c6391ca9b7c183aeec22b4fd24c300c
• https://git.kernel.org/stable/c/98e8aed64614b0c199d5f0391fbe1a4331cb5773
• https://git.kernel.org/stable/c/069c8f5aebe4d5224cf62acc7d4b3486091c658a

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