CVE-2025-68282 (GCVE-0-2025-68282)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2026-05-11 21:50
VLAI
Title
usb: gadget: udc: fix use-after-free in usb_gadget_state_work
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: udc: fix use-after-free in usb_gadget_state_work A race condition during gadget teardown can lead to a use-after-free in usb_gadget_state_work(), as reported by KASAN: BUG: KASAN: invalid-access in sysfs_notify+0x2c/0xd0 Workqueue: events usb_gadget_state_work The fundamental race occurs because a concurrent event (e.g., an interrupt) can call usb_gadget_set_state() and schedule gadget->work at any time during the cleanup process in usb_del_gadget(). Commit 399a45e5237c ("usb: gadget: core: flush gadget workqueue after device removal") attempted to fix this by moving flush_work() to after device_del(). However, this does not fully solve the race, as a new work item can still be scheduled *after* flush_work() completes but before the gadget's memory is freed, leading to the same use-after-free. This patch fixes the race condition robustly by introducing a 'teardown' flag and a 'state_lock' spinlock to the usb_gadget struct. The flag is set during cleanup in usb_del_gadget() *before* calling flush_work() to prevent any new work from being scheduled once cleanup has commenced. The scheduling site, usb_gadget_set_state(), now checks this flag under the lock before queueing the work, thus safely closing the race window.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 , < dddc944d65169b552e09cb54e3ed4fbb9ea26416 (git)
Affected: 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 , < eee16f3ff08e759ea828bdf7dc1c0ef2f22134f5 (git)
Affected: 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 , < c12a0c3ef815ddd67e47f9c819f9fe822fed5467 (git)
Affected: 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 , < f02a412c0a18f02f0f91b0a3d9788315a721b7fd (git)
Affected: 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 , < 10014310193cf6736c1aeb4105c5f4a0818d0c65 (git)
Affected: 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 , < 3b32caa73d135eea8fb9cabb45e9fc64c5a3ecb9 (git)
Affected: 5702f75375aa9ecf8ad3431aef3fe6ce8c8dbd15 , < baeb66fbd4201d1c4325074e78b1f557dff89b5b (git)
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Linux Linux Affected: 3.12
Unaffected: 0 , < 3.12 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.119 , ≤ 6.6.* (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: fix use-after-free in usb_gadget_state_work\n\nA race condition during gadget teardown can lead to a use-after-free\nin usb_gadget_state_work(), as reported by KASAN:\n\n  BUG: KASAN: invalid-access in sysfs_notify+0x2c/0xd0\n  Workqueue: events usb_gadget_state_work\n\nThe fundamental race occurs because a concurrent event (e.g., an\ninterrupt) can call usb_gadget_set_state() and schedule gadget-\u003ework\nat any time during the cleanup process in usb_del_gadget().\n\nCommit 399a45e5237c (\"usb: gadget: core: flush gadget workqueue after\ndevice removal\") attempted to fix this by moving flush_work() to after\ndevice_del(). However, this does not fully solve the race, as a new\nwork item can still be scheduled *after* flush_work() completes but\nbefore the gadget\u0027s memory is freed, leading to the same use-after-free.\n\nThis patch fixes the race condition robustly by introducing a \u0027teardown\u0027\nflag and a \u0027state_lock\u0027 spinlock to the usb_gadget struct. The flag is\nset during cleanup in usb_del_gadget() *before* calling flush_work() to\nprevent any new work from being scheduled once cleanup has commenced.\nThe scheduling site, usb_gadget_set_state(), now checks this flag under\nthe lock before queueing the work, thus safely closing the race window."
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    "dateUpdated": "2026-05-11T21:50:08.718Z",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: fix use-after-free in usb_gadget_state_work\n\nA race condition during gadget teardown can lead to a use-after-free\nin usb_gadget_state_work(), as reported by KASAN:\n\n  BUG: KASAN: invalid-access in sysfs_notify+0x2c/0xd0\n  Workqueue: events usb_gadget_state_work\n\nThe fundamental race occurs because a concurrent event (e.g., an\ninterrupt) can call usb_gadget_set_state() and schedule gadget-\u003ework\nat any time during the cleanup process in usb_del_gadget().\n\nCommit 399a45e5237c (\"usb: gadget: core: flush gadget workqueue after\ndevice removal\") attempted to fix this by moving flush_work() to after\ndevice_del(). However, this does not fully solve the race, as a new\nwork item can still be scheduled *after* flush_work() completes but\nbefore the gadget\u0027s memory is freed, leading to the same use-after-free.\n\nThis patch fixes the race condition robustly by introducing a \u0027teardown\u0027\nflag and a \u0027state_lock\u0027 spinlock to the usb_gadget struct. The flag is\nset during cleanup in usb_del_gadget() *before* calling flush_work() to\nprevent any new work from being scheduled once cleanup has commenced.\nThe scheduling site, usb_gadget_set_state(), now checks this flag under\nthe lock before queueing the work, thus safely closing the race window."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nusb: gadget: udc: corregir uso despu\u00e9s de liberaci\u00f3n en usb_gadget_state_work\n\nUna condici\u00f3n de carrera durante el desmontaje del gadget puede llevar a un uso despu\u00e9s de liberaci\u00f3n en usb_gadget_state_work(), seg\u00fan lo informado por KASAN:\n\n  BUG: KASAN: acceso inv\u00e1lido en sysfs_notify+0x2c/0xd0\n  Workqueue: events usb_gadget_state_work\n\nLa condici\u00f3n de carrera fundamental ocurre porque un evento concurrente (por ejemplo, una interrupci\u00f3n) puede llamar a usb_gadget_set_state() y programar gadget -\u003e work en cualquier momento durante el proceso de limpieza en usb_del_gadget().\n\nEl commit 399a45e5237c (\u0027usb: gadget: core: purgar la cola de trabajo del gadget despu\u00e9s de la eliminaci\u00f3n del dispositivo\u0027) intent\u00f3 corregir esto moviendo flush_work() a despu\u00e9s de device_del(). Sin embargo, esto no resuelve completamente la condici\u00f3n de carrera, ya que un nuevo elemento de trabajo a\u00fan puede ser programado despu\u00e9s de que flush_work() se complete pero antes de que se libere la memoria del gadget, lo que lleva al mismo uso despu\u00e9s de liberaci\u00f3n.\n\nEste parche corrige la condici\u00f3n de carrera de forma robusta introduciendo un indicador \u0027teardown\u0027 y un spinlock \u0027state_lock\u0027 en la estructura usb_gadget. El indicador se establece durante la limpieza en usb_del_gadget() antes de llamar a flush_work() para evitar que se programe cualquier nuevo trabajo una vez que la limpieza ha comenzado. El sitio de programaci\u00f3n, usb_gadget_set_state(), ahora verifica este indicador bajo el bloqueo antes de encolar el trabajo, cerrando as\u00ed de forma segura la ventana de la condici\u00f3n de carrera."
          }
        ],
        "id": "CVE-2025-68282",
        "lastModified": "2026-10-13T19:10:00.193",
        "metrics": {},
        "published": "2025-12-16T16:16:06.970",
        "references": [
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            "url": "https://git.kernel.org/stable/c/dddc944d65169b552e09cb54e3ed4fbb9ea26416"
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            "url": "https://git.kernel.org/stable/c/eee16f3ff08e759ea828bdf7dc1c0ef2f22134f5"
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            "url": "https://git.kernel.org/stable/c/f02a412c0a18f02f0f91b0a3d9788315a721b7fd"
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T01:33:41+00:00",
      "cve": "CVE-2025-68282",
      "id": "CVE-2025-68282",
      "initial_release_date": "2025-12-16T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Use-after-free in USB gadget driver due to race condition during teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68282.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-15T15:57:03Z",
      "cve": "CVE-2025-68282",
      "id": "CVE-2025-68282",
      "initial_release_date": "2025-12-19T00:24:38Z",
      "product_status:known_affected": "549",
      "product_status:known_not_affected": "6",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68282",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-68282.json",
      "version": "18"
    }
  }
}



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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.