CVE-2026-31756

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5cb3cb3db317c58d50b68f3ca3bb8343ea9d1acd < e9fcca3e87463013d595c65c2189ffaa32ad3b50affected
LinuxLinux1ac826cebc2776f91569f2aa9c9c3da2375d2096 < 8ffe31acb3b77a30ae34d01719a269881569fb7faffected
LinuxLinux41732f9febdccb4f9b87c13cb915d717d68ccafd < beab10429439e20708036a66fb0d97ffb79da6a1affected
LinuxLinuxba78c2b3254c4a458c01776612e8a573e12f8d26 < 4ed9d2dd9f29828c311db6ec4b8e0d34bfd6d6a4affected
LinuxLinuxaf076a41f8a28faf9ceb9dd2d88aef2c202ef39a < 61937f686290494998236c680ce0836b8dd63a3faffected
LinuxLinuxaf076a41f8a28faf9ceb9dd2d88aef2c202ef39a < 51b62286fc668c6eb74dee7624ec0beec3c5a0edaffected
LinuxLinuxaf076a41f8a28faf9ceb9dd2d88aef2c202ef39a < 9bb4b5ed7f8c4f95cc556bdf042b0ba2fa13557aaffected
LinuxLinuxb39c203690fa1678daecc60f347e43c8b593b969affected
LinuxLinux5.15.187 < 5.15.203affected
LinuxLinux6.1.143 < 6.1.168affected
LinuxLinux6.6.96 < 6.6.134affected
LinuxLinux6.12.36 < 6.12.81affected
LinuxLinux6.15.5 < 6.16affected
LinuxLinux6.16affected
LinuxLinux0 < 6.16unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.168 <= 6.1.*unaffected
LinuxLinux6.6.134 <= 6.6.*unaffected
LinuxLinux6.12.81 <= 6.12.*unaffected
LinuxLinux6.18.22 <= 6.18.*unaffected
LinuxLinux6.19.12 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References