{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89887",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89887"
  ],
  "published": "2026-09-16T10:32:03Z",
  "summary": "media: i2c: ov7740: fix use-after-destroy in remove",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: i2c: ov7740: fix use-after-destroy in remove\n\nThe ov7740_remove() function had a severe teardown order bug where it\ndestroyed the driver's mutex before freeing the V4L2 control handler\nwhich relies on that mutex, leading to a use-after-destroy kernel panic.\nFurthermore, the driver explicitly called v4l2_ctrl_handler_free() and\nmutex_destroy() sequentially, but then called ov7740_free_controls()\nwhich invokes both of them a second time, resulting in a double-free.\n\nThis patch fixes the issue by unregistering the subdevice first, and\nrelying exclusively on ov7740_free_controls() to safely tear down the\nmutex and control handler in the correct order.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.188",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89887"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9e4693436c7dcf8584002500ce4b434b79bbf9ed"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/81e9765878d3ac8ad18e3a683332b5d6bc3a0e33"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8a02ee6c1c4e88f3a0442bd60d3c77db9a30db5e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7512838a19af0a284a58435292243fad21e57ff1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/25e2505866c577db2661e4d431f0907c6ec9a3b4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/af81f35e4f429e769b784754e1aa4d7a922470ac"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/09453b467990e8ef8fe09f45a685f9a625248d33"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5d1b3dea5a44124bab6c14a2d71b977dabed54e7"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-16T14:40:32Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is in ov7740_remove() for the onboard OmniVision OV7740 I2C/CSI camera sensor, reached via local I2C teardown (sysfs unbind, i2c delete_device, rmmod) and V4L2 ioctls on /dev/v4l-subdev* (V4L2_SUBDEV_FL_HAS_DEVNODE). No network, Bluetooth, or USB packet path exists.\nAC:L - ov7740_remove() deterministically mutex_destroy()s ov7740->mutex then v4l2_ctrl_handler_free() locks that same mutex and kvfree()s all v4l2_ctrl objects while the subdev is still registered. An attacker holding the node and driving teardown needs no uncontrollable race or rare debug config.\nPR:L - VIDIOC_G/S_CTRL on the subdev node have no capable() check; udev typically grants /dev/v4l-subdev* to the video group or Android camera UID on SAMA5/embedded boards shipping CONFIG_VIDEO_OV7740. Per CNA driver-removal UAF and media i2c unbind precedent this is PR:L, not init-namespace root.\nUI:N - The attacker opens the V4L2 subdev node and initiates or coordinates driver teardown themselves (unbind/rmmod/maintenance). CNA driver-removal UAFs score UI:N; no separate victim action such as mounting a filesystem is required.\nS:U - The UAF corrupts host kernel heap (struct v4l2_ctrl, v4l2_ctrl_ref, and handler buckets) within the same OS security authority. It is not a VM escape, IOMMU/DMA isolation bypass, or sandbox breakout.\nC:H - v4l2_ctrl_handler_free() kvfree()s each v4l2_ctrl while open fds still hold vfh->ctrl_handler and issue VIDIOC_G_CTRL/G_EXT_CTRLS through dangling ctrl lists. Per kernel UAF guidance this enables arbitrary kernel disclosure, so confidentiality is High.\nI:H - struct v4l2_ctrl embeds ops and type_ops function pointers; VIDIOC_S_CTRL on a sprayed freed object yields control-flow hijack. Kernel UAF guidance scores this High integrity.\nA:H - mutex_lock of the destroyed mutex and later walks of freed ctrl lists after handler_free oops or panic the kernel even when the UAF is not fully turned into a write primitive, so availability is High."
    }
  }
}