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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
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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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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 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T11:52:40+00:00",
      "cve": "CVE-2026-31728",
      "id": "CVE-2026-31728",
      "initial_release_date": "2026-05-01T00:00:00+00:00",
      "product_status:known_affected": "76",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: u_ether: Fix race between gether_disconnect and eth_stop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31728.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T01:27:28Z",
      "cve": "CVE-2026-31728",
      "id": "CVE-2026-31728",
      "initial_release_date": "2026-05-06T01:43:25Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "559",
      "product_status:known_not_affected": "51",
      "product_status:recommended": "265",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31728",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31728.json",
      "version": "8"
    }
  }
}



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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

Author Source Type Date Other

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.