{
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  "id": "RPI-CVE-2026-89741",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89741"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "Revert \"media: v4l2-dev: fix error handling in __video_register_device()\"",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRevert \"media: v4l2-dev: fix error handling in __video_register_device()\"\n\nThis reverts commit 2a934fdb01db6458288fc9386d3d8ceba6dd551a.\n\nThe intentions of that patch were good, but it doesn't work.\n\nThe idea is that if device_register fails, you have to do a put_device\nto let the ref counter release resources.\n\nHowever, the V4L2 API says that if video_register_device() fails, then\nyou have to call video_device_release(), which kfree()s the video_device\nstruct.\n\nBut the put_device() will already have freed the struct, so you end\nup in a double-free scenario.\n\nThere is not really a good way of fixing this without breaking\nvideo_register_device() into two parts, one that initializes everything,\nand one that does the actual device_register, and then converting all\nV4L2 drivers to this new model.\n\nThat is a massive job, and it is very unlikely that device_register\nwill fail.\n\nSo rather than ending up in a double-free scenario, just revert this\npatch, and in that case we'll have a small memory leak. Which is a lot\nmore robust.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89741"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8b998c171ed875e402e1fd1c5cd619e4ca05e9c1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3de14b4f681a1b3c6d375d98d9d37a55ebb85349"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8027f82c0f5474ed72448e160ee9778051fa1f49"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2ac009a65d2385e9f0799eaf9d9694a29153a161"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The double-free is in __video_register_device(), reached from local V4L2 registration such as USB gadget UVC configfs UDC bind (uvc_function_bind \u2192 uvc_register_video) and usbfs/sysfs re-probe of USB cameras; dummy_hcd suffices and there is no remote packet path.\nAC:L - A local attacker can retry gadget bind or device re-probe under memory/resource pressure to make device_register() fail and take the put_device() error path; success does not depend on a victim-owned race or uninfluenced layout.\nPR:L - __video_register_device() and uvc_function_bind() perform no capable() check; Android/embedded HALs routinely delegate usb_gadget configfs to non-root, and desktop usbfs/video nodes are typically uaccess/video-group, so init-namespace root is not required.\nUI:N - The attacker performs the configfs UDC bind or local re-probe and applies resource pressure themselves; no separate victim mount, file-open, or cable-plug action is required.\nS:U - The heap double-free corrupts a kmalloc'd video_device or the parent object freed by vdev->release() inside the same host kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - On device_register() failure the buggy put_device() runs v4l2_device_release() which calls vdev->release()/kfree, then callers such as video_device_release() or gspca/uvc probe error paths free the same object again, yielding a UAF disclosure primitive.\nI:H - The same double-free of struct video_device (or parent driver objects via vdev->release, as in UVC kref_put/uvc_delete and gspca_release) is heap corruption that can be sprayed into an arbitrary write and control-flow hijack.\nA:H - The double-free and premature v4l2_device_release() (including media_devnode_remove() on a still-NULL intf_devnode) oops or panic the kernel, and the attacker can repeat failed registration to force the crash."
    }
  }
}