CVE-2026-89887 (GCVE-0-2026-89887)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:54
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: media: i2c: ov7740: fix use-after-destroy in remove The ov7740_remove() function had a severe teardown order bug where it destroyed the driver's mutex before freeing the V4L2 control handler which relies on that mutex, leading to a use-after-destroy kernel panic. Furthermore, the driver explicitly called v4l2_ctrl_handler_free() and mutex_destroy() sequentially, but then called ov7740_free_controls() which invokes both of them a second time, resulting in a double-free. This patch fixes the issue by unregistering the subdevice first, and relying exclusively on ov7740_free_controls() to safely tear down the mutex and control handler in the correct order.
References
Impacted products
Vendor Product Version
Linux Linux Version: 39c5c4471b8d793daf868bd004e56ed420e89707
Version: 39c5c4471b8d793daf868bd004e56ed420e89707
Version: 39c5c4471b8d793daf868bd004e56ed420e89707
Version: 39c5c4471b8d793daf868bd004e56ed420e89707
Version: 39c5c4471b8d793daf868bd004e56ed420e89707
Version: 39c5c4471b8d793daf868bd004e56ed420e89707
Version: 39c5c4471b8d793daf868bd004e56ed420e89707
Version: 39c5c4471b8d793daf868bd004e56ed420e89707
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/i2c/ov7740.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "39c5c4471b8d793daf868bd004e56ed420e89707",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "39c5c4471b8d793daf868bd004e56ed420e89707",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "39c5c4471b8d793daf868bd004e56ed420e89707",
              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
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            {
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            },
            {
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/media/i2c/ov7740.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.16"
            },
            {
              "lessThan": "4.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.51",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.5",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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\u0027s 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."
        }
      ],
      "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 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-\u003emutex 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-\u003ectrl_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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:54:20.308Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9e4693436c7dcf8584002500ce4b434b79bbf9ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/81e9765878d3ac8ad18e3a683332b5d6bc3a0e33"
        },
        {
          "url": "https://git.kernel.org/stable/c/8a02ee6c1c4e88f3a0442bd60d3c77db9a30db5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7512838a19af0a284a58435292243fad21e57ff1"
        },
        {
          "url": "https://git.kernel.org/stable/c/25e2505866c577db2661e4d431f0907c6ec9a3b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/af81f35e4f429e769b784754e1aa4d7a922470ac"
        },
        {
          "url": "https://git.kernel.org/stable/c/09453b467990e8ef8fe09f45a685f9a625248d33"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d1b3dea5a44124bab6c14a2d71b977dabed54e7"
        }
      ],
      "title": "media: i2c: ov7740: fix use-after-destroy in remove",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89887",
    "datePublished": "2026-09-16T10:31:51.195Z",
    "dateReserved": "2026-09-11T19:38:34.773Z",
    "dateUpdated": "2026-10-19T08:54:20.308Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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