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CVE-2026-31756

usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.16
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: dwc2: gadget: Fix spin_lock/unlock mismatch in dwc2_hsotg_udc_stop() dwc2_gadget_exit_clock_gating() internally calls call_gadget() macro, which expects hsotg->lock to be held since it does spin_unlock/spin_lock around the gadget driver callback invocation. However, dwc2_hsotg_udc_stop() calls dwc2_gadget_exit_clock_gating() without holding the lock. This leads to: • spin_unlock on a lock that is not held (undefined behavior) • The lock remaining held after dwc2_gadget_exit_clock_gating() returns, causing a deadlock when spin_lock_irqsave() is called later in the same function. Fix this by acquiring hsotg->lock before calling dwc2_gadget_exit_clock_gating() and releasing it afterwards, which satisfies the locking requirement of the call_gadget() macro.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 5.15.187 · fixed in 5.15.203; From 6.1.143 · fixed in 6.1.168; From 6.6.96 · fixed in 6.6.134; From 6.12.36 · fixed in 6.12.81; From 6.15.5 · fixed in 6.16

  • Linux Linux

    6.16

References 7

git.kernel.org