CVE-2026-31728 (GCVE-0-2026-31728)

Vulnerability from cvelistv5 – Published: 2026-05-01 14:14 – Updated: 2026-05-11 22:14
VLAI?
Title
usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2b3d942c4878084a37991a65e66512c02b8fa2ad , < f02980594deef751e42133714aee25228f1494c6 (git)
Affected: 2b3d942c4878084a37991a65e66512c02b8fa2ad , < e1e7a66584bf0aff3becb73c19fa31527889fc9e (git)
Affected: 2b3d942c4878084a37991a65e66512c02b8fa2ad , < a259ba0bce3b192c04334499690372a250f7d0b1 (git)
Affected: 2b3d942c4878084a37991a65e66512c02b8fa2ad , < f6813c2b2ae78def76b69e0f9d72f80e4a1c4aca (git)
Affected: 2b3d942c4878084a37991a65e66512c02b8fa2ad , < bbb09bb89ffa571475f66daca9482b974cd29d6a (git)
Affected: 2b3d942c4878084a37991a65e66512c02b8fa2ad , < 6ad77458637b78ec655e3da5f112c862e6690a9d (git)
Affected: 2b3d942c4878084a37991a65e66512c02b8fa2ad , < 8ff689edfeceb5e3ec1623e09af2b2aa0f1098a8 (git)
Affected: 2b3d942c4878084a37991a65e66512c02b8fa2ad , < e1eabb072c75681f78312c484ccfffb7430f206e (git)
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Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.169 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_ether: Fix race between gether_disconnect and eth_stop\n\nA race condition between gether_disconnect() and eth_stop() leads to a\nNULL pointer dereference. Specifically, if eth_stop() is triggered\nconcurrently while gether_disconnect() is tearing down the endpoints,\neth_stop() attempts to access the cleared endpoint descriptor, causing\nthe following NPE:\n\n  Unable to handle kernel NULL pointer dereference\n  Call trace:\n   __dwc3_gadget_ep_enable+0x60/0x788\n   dwc3_gadget_ep_enable+0x70/0xe4\n   usb_ep_enable+0x60/0x15c\n   eth_stop+0xb8/0x108\n\nBecause eth_stop() crashes while holding the dev-\u003elock, the thread\nrunning gether_disconnect() fails to acquire the same lock and spins\nforever, resulting in a hardlockup:\n\n  Core - Debugging Information for Hardlockup core(7)\n  Call trace:\n   queued_spin_lock_slowpath+0x94/0x488\n   _raw_spin_lock+0x64/0x6c\n   gether_disconnect+0x19c/0x1e8\n   ncm_set_alt+0x68/0x1a0\n   composite_setup+0x6a0/0xc50\n\nThe root cause is that the clearing of dev-\u003eport_usb in\ngether_disconnect() is delayed until the end of the function.\n\nMove the clearing of dev-\u003eport_usb to the very beginning of\ngether_disconnect() while holding dev-\u003elock. This cuts off the link\nimmediately, ensuring eth_stop() will see dev-\u003eport_usb as NULL and\nsafely bail out."
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          "url": "https://git.kernel.org/stable/c/e1eabb072c75681f78312c484ccfffb7430f206e"
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      "title": "usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop",
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    "dateUpdated": "2026-05-11T22:14:36.858Z",
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Specifically, if eth_stop() is triggered\\nconcurrently while gether_disconnect() is tearing down the endpoints,\\neth_stop() attempts to access the cleared endpoint descriptor, causing\\nthe following NPE:\\n\\n  Unable to handle kernel NULL pointer dereference\\n  Call trace:\\n   __dwc3_gadget_ep_enable+0x60/0x788\\n   dwc3_gadget_ep_enable+0x70/0xe4\\n   usb_ep_enable+0x60/0x15c\\n   eth_stop+0xb8/0x108\\n\\nBecause eth_stop() crashes while holding the dev-\u003elock, the thread\\nrunning gether_disconnect() fails to acquire the same lock and spins\\nforever, resulting in a hardlockup:\\n\\n  Core - Debugging Information for Hardlockup core(7)\\n  Call trace:\\n   queued_spin_lock_slowpath+0x94/0x488\\n   _raw_spin_lock+0x64/0x6c\\n   gether_disconnect+0x19c/0x1e8\\n   ncm_set_alt+0x68/0x1a0\\n   composite_setup+0x6a0/0xc50\\n\\nThe root cause is that the clearing of dev-\u003eport_usb in\\ngether_disconnect() is delayed until the end of the function.\\n\\nMove the clearing of dev-\u003eport_usb to the very beginning of\\ngether_disconnect() while holding dev-\u003elock. 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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.