GHSA-3P7C-R2J9-9RQV

Vulnerability from github – Published: 2026-08-10 15:33 – Updated: 2026-08-19 18:32
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

media: pwc: Return queued buffers on start_streaming() failure

The vb2 framework hands buffers to the driver via buf_queue() before calling start_streaming(). If start_streaming() returns an error without first returning those buffers via vb2_buffer_done(), vb2_start_streaming() fires WARN_ON(owned_by_drv_count) and the queued buffers leak.

pwc's start_streaming() had two early returns that hit this trap: -ENODEV when the USB device was already disconnected, and -ERESTARTSYS when mutex_lock_interruptible() was interrupted by a signal. Call the existing pwc_cleanup_queued_bufs() helper with VB2_BUF_STATE_QUEUED before returning (matching the state already used by the pwc_isoc_init() error path in the same function).

This mirrors the uvcvideo fix in commit 4cf3b6fd54eb ("media: uvcvideo: Return queued buffers on start_streaming() failure").

Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-68216"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-10T13:20:09Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: pwc: Return queued buffers on start_streaming() failure\n\nThe vb2 framework hands buffers to the driver via buf_queue() before\ncalling start_streaming().  If start_streaming() returns an error\nwithout first returning those buffers via vb2_buffer_done(),\nvb2_start_streaming() fires WARN_ON(owned_by_drv_count) and the queued\nbuffers leak.\n\npwc\u0027s start_streaming() had two early returns that hit this trap:\n-ENODEV when the USB device was already disconnected, and -ERESTARTSYS\nwhen mutex_lock_interruptible() was interrupted by a signal.  Call the\nexisting pwc_cleanup_queued_bufs() helper with VB2_BUF_STATE_QUEUED\nbefore returning (matching the state already used by the\npwc_isoc_init() error path in the same function).\n\nThis mirrors the uvcvideo fix in commit 4cf3b6fd54eb (\"media: uvcvideo:\nReturn queued buffers on start_streaming() failure\").",
  "id": "GHSA-3p7c-r2j9-9rqv",
  "modified": "2026-08-19T18:32:11Z",
  "published": "2026-08-10T15:33:41Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68216"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0362ae30b61b3053ee3095c1b8f179197ec4f539"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d7cc2634c3843a1414a0f6407aa17f1f91dee60"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/975b2ee20e569d47821e4f6c9761b4664d48a6a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a4f8f629983f643333e49df90557805469bcbb25"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb16b79a2be2cec9c3ebe4147490817c4d8b1de3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d552852bf76b7dfb35b4593fc874d8dd2f1b1bf3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2f9fcacd81953dde6cb86312ab13ca13e689664"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa78e590852751d3ad32f33f6b4e210fe6ccbe9b"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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