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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-31728

usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop A race condition between gether_disconnect() and eth_stop() leads to a NULL pointer dereference. Specifically, if eth_stop() is triggered concurrently while gether_disconnect() is tearing down the endpoints, eth_stop() attempts to access the cleared endpoint descriptor, causing the following NPE: Unable to handle kernel NULL pointer dereference Call trace: __dwc3_gadget_ep_enable+0x60/0x788 dwc3_gadget_ep_enable+0x70/0xe4 usb_ep_enable+0x60/0x15c eth_stop+0xb8/0x108 Because eth_stop() crashes while holding the dev->lock, the thread running gether_disconnect() fails to acquire the same lock and spins forever, resulting in a hardlockup: Core - Debugging Information for Hardlockup core(7) Call trace: queued_spin_lock_slowpath+0x94/0x488 _raw_spin_lock+0x64/0x6c gether_disconnect+0x19c/0x1e8 ncm_set_alt+0x68/0x1a0 composite_setup+0x6a0/0xc50 The root cause is that the clearing of dev->port_usb in gether_disconnect() is delayed until the end of the function. Move the clearing of dev->port_usb to the very beginning of gether_disconnect() while holding dev->lock. This cuts off the link immediately, ensuring eth_stop() will see dev->port_usb as NULL and safely bail out.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 2b3d942c4878084a37991a65e66512c02b8fa2ad to < f02980594deef751e42133714aee25228f1494c6affected
  • 2b3d942c4878084a37991a65e66512c02b8fa2ad to < e1e7a66584bf0aff3becb73c19fa31527889fc9eaffected
  • 2b3d942c4878084a37991a65e66512c02b8fa2ad to < a259ba0bce3b192c04334499690372a250f7d0b1affected
  • 2b3d942c4878084a37991a65e66512c02b8fa2ad to < f6813c2b2ae78def76b69e0f9d72f80e4a1c4acaaffected
  • 2b3d942c4878084a37991a65e66512c02b8fa2ad to < bbb09bb89ffa571475f66daca9482b974cd29d6aaffected
  • 2b3d942c4878084a37991a65e66512c02b8fa2ad to < 6ad77458637b78ec655e3da5f112c862e6690a9daffected
  • 2b3d942c4878084a37991a65e66512c02b8fa2ad to < 8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8affected
  • 2b3d942c4878084a37991a65e66512c02b8fa2ad to < e1eabb072c75681f78312c484ccfffb7430f206eaffected

Linux Linux

Default version status: affected

  • 2.6.27affected
  • 0 to < 2.6.27unaffected
  • 5.10.253 to ≤ 5.10.*unaffected
  • 5.15.203 to ≤ 5.15.*unaffected
  • 6.1.169 to ≤ 6.1.*unaffected
  • 6.6.134 to ≤ 6.6.*unaffected
  • 6.12.81 to ≤ 6.12.*unaffected
  • 6.18.22 to ≤ 6.18.*unaffected
  • 6.19.12 to ≤ 6.19.*unaffected
  • 7.0 to ≤ *unaffected

References