CVE-2026-89741 (GCVE-0-2026-89741)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-19 08:51
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: Revert "media: v4l2-dev: fix error handling in __video_register_device()" This reverts commit 2a934fdb01db6458288fc9386d3d8ceba6dd551a. The intentions of that patch were good, but it doesn't work. The idea is that if device_register fails, you have to do a put_device to let the ref counter release resources. However, the V4L2 API says that if video_register_device() fails, then you have to call video_device_release(), which kfree()s the video_device struct. But the put_device() will already have freed the struct, so you end up in a double-free scenario. There is not really a good way of fixing this without breaking video_register_device() into two parts, one that initializes everything, and one that does the actual device_register, and then converting all V4L2 drivers to this new model. That is a massive job, and it is very unlikely that device_register will fail. So rather than ending up in a double-free scenario, just revert this patch, and in that case we'll have a small memory leak. Which is a lot more robust.
References
Impacted products
Vendor Product Version
Linux Linux Version: e5c8e62ae551e0ad2e15412aa0c57c2856d59677
Version: 8b451a9a46f2bfc510e6d5c2492df91647586184
Version: b6be1f5633eae200af2527e9eeb7f51be5739b0f
Version: ae7b143e05b36fc69d6571751855946cc45064c6
Version: 2429bb9fad88c8fa84c4956b0a21cf5afe5e92b7
Version: 2a934fdb01db6458288fc9386d3d8ceba6dd551a
Version: 2a934fdb01db6458288fc9386d3d8ceba6dd551a
Version: 2a934fdb01db6458288fc9386d3d8ceba6dd551a
Version: ee141706e701356dda41c6fed9ee18bf427c28e3
Version: 4451412739ed33a49b34624299394ee575116d0c
Version: 5.10.239   ≤
Version: 5.15.186   ≤
Version: 6.1.142   ≤
Version: 6.6.95   ≤
Version: 6.12.35   ≤
Version: 5.4.295   ≤
Version: 6.15.4   ≤
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      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027t 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\u0027ll have a small memory leak. Which is a lot\nmore robust."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "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\u0027d video_device or the parent object freed by vdev-\u003erelease() 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-\u003erelease()/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-\u003erelease, 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:51:55.196Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8b998c171ed875e402e1fd1c5cd619e4ca05e9c1"
        },
        {
          "url": "https://git.kernel.org/stable/c/3de14b4f681a1b3c6d375d98d9d37a55ebb85349"
        },
        {
          "url": "https://git.kernel.org/stable/c/8027f82c0f5474ed72448e160ee9778051fa1f49"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ac009a65d2385e9f0799eaf9d9694a29153a161"
        },
        {
          "url": "https://git.kernel.org/stable/c/712ca1cf756de2557a116e0df55791bac0c9f99e"
        },
        {
          "url": "https://git.kernel.org/stable/c/aad08b5f67d2a8116e1a00bce2611c1513b10bce"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce792b94e03882108019ba996c1a7c4d4e09be2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7600f5cee5de14065f950807931d6e6d40fb2d7"
        }
      ],
      "title": "Revert \"media: v4l2-dev: fix error handling in __video_register_device()\"",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89741",
    "datePublished": "2026-09-11T19:46:47.877Z",
    "dateReserved": "2026-09-11T19:38:34.761Z",
    "dateUpdated": "2026-10-19T08:51:55.196Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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