CVE-2026-43324

/// Technical description

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

USB: dummy-hcd: Fix interrupt synchronization error

This fixes an error in synchronization in the dummy-hcd driver. The

error has a somewhat involved history. The synchronization mechanism

was introduced by commit 7dbd8f4cabd9 ("USB: dummy-hcd: Fix erroneous

synchronization change"), which added an emulated "interrupts enabled"

flag together with code emulating synchronize_irq() (it waits until

all current handler callbacks have returned).

But the emulated interrupt-disable occurred too late, after the driver

containing the handler callback routines had been told that it was

unbound and no more callbacks would occur. Commit 4a5d797a9f9c ("usb:

gadget: dummy_hcd: fix gpf in gadget_setup") tried to fix this by

moving the synchronize_irq() emulation code from dummy_stop() to

dummy_pullup(), which runs before the unbind callback.

There still were races, though, because the emulated interrupt-disable

still occurred t

/// 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