CVE-2026-89522 (GCVE-0-2026-89522)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:48
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: staging/ipu7: fix async notifier UAF on probe error path isys_register_devices() registers the V4L2 async notifier via isys_notifier_init(). If a subsequent probe step such as isys_fw_log_init() fails, isys_probe() jumps to the out_cleanup label which only calls isys_unregister_devices(). That helper tears down the video devices, subdevices, V4L2 device and media device, but never unregisters or cleans up the async notifier. As a result the notifier stays chained in the global notifier_list while the enclosing struct ipu7_isys is freed by devres, leading to list corruption and a use-after-free the next time the list is walked. The remove path already does the right thing by calling isys_notifier_cleanup() before isys_unregister_devices(). Mirror that on the probe error path so the notifier is unregistered and cleaned up before the device is torn down.
References
Impacted products
Vendor Product Version
Linux Linux Version: a516d36bdc3d8373f904af57c95e76d6f921cf1c
Version: a516d36bdc3d8373f904af57c95e76d6f921cf1c
Version: a516d36bdc3d8373f904af57c95e76d6f921cf1c
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/media/ipu7/ipu7-isys.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2a8dd9fd12f3f6b21207cec8f50c92cd428e6b81",
              "status": "affected",
              "version": "a516d36bdc3d8373f904af57c95e76d6f921cf1c",
              "versionType": "git"
            },
            {
              "lessThan": "323c411fb63122e8cef5b833032d69d59a838559",
              "status": "affected",
              "version": "a516d36bdc3d8373f904af57c95e76d6f921cf1c",
              "versionType": "git"
            },
            {
              "lessThan": "d7f48aa7d60c65d3e6d5312c27f17d5525a245fb",
              "status": "affected",
              "version": "a516d36bdc3d8373f904af57c95e76d6f921cf1c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/media/ipu7/ipu7-isys.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "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": "6.18.50",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: staging/ipu7: fix async notifier UAF on probe error path\n\nisys_register_devices() registers the V4L2 async notifier via\nisys_notifier_init(). If a subsequent probe step such as\nisys_fw_log_init() fails, isys_probe() jumps to the out_cleanup label\nwhich only calls isys_unregister_devices(). That helper tears down the\nvideo devices, subdevices, V4L2 device and media device, but never\nunregisters or cleans up the async notifier.\n\nAs a result the notifier stays chained in the global notifier_list while\nthe enclosing struct ipu7_isys is freed by devres, leading to list\ncorruption and a use-after-free the next time the list is walked.\n\nThe remove path already does the right thing by calling\nisys_notifier_cleanup() before isys_unregister_devices(). Mirror that on\nthe probe error path so the notifier is unregistered and cleaned up\nbefore the device is torn down."
        }
      ],
      "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 flaw is in isys_probe() of the Intel IPU7 ISYS auxiliary driver (PCI IDs 0x645d/0xb05d on Meteor Lake/Arrow Lake/Lunar Lake laptops). It is reached only via local driver bind of the onboard MIPI camera ISP, not via network packets, Bluetooth, or USB attachment.\nAC:L - The missing isys_notifier_cleanup() on the out_cleanup path is deterministic. A local attacker can force the subsequent 2 MiB FW_LOG_BUF_SIZE kzalloc in isys_fw_log_init() to fail under memory pressure, and the UAF is then hit the next time notifier_list is walked, with no race the attacker must win.\nPR:L - After probe failure leaves the notifier on the global notifier_list, ACPI camera sensors typical of IPU7 laptops (ov02c10, ov08x40, and similar) call v4l2_async_register_subdev_sensor() and walk that list without capabilities. Per CNA guidance, Low is used when probe/bind privilege gating is ambiguous.\nUI:N - No victim action such as opening /dev/video*, mounting a filesystem, or plugging a device is required. The dangling notifier is planted on the probe error path and consumed automatically when a sensor or other V4L2 async client registers.\nS:U - Impact is host-kernel slab use-after-free and list corruption inside the IPU7/V4L2 async core. This is standard kernel privilege-escalation territory and does not cross a VM, IOMMU, or sandbox security boundary.\nC:H - The notifier is embedded in struct ipu7_isys, which devres frees while it remains linked on notifier_list. A later walk reads freed notifier fields and ops; per kernel CNA UAF guidance that reuse primitive enables arbitrary kernel memory disclosure.\nI:H - Walking or unlinking the dangling notifier_entry corrupts kernel lists, and a reclaimed object can redirect notifier-\u003eops (bound/complete) to attacker-controlled function pointers, yielding an arbitrary-write and control-flow hijack primitive.\nA:H - The next notifier_list walk or bound callback on the freed ipu7_isys object causes a kernel oops or panic, and use-after-free heap corruption inherently denies availability even without a full exploit."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:48:13.544Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2a8dd9fd12f3f6b21207cec8f50c92cd428e6b81"
        },
        {
          "url": "https://git.kernel.org/stable/c/323c411fb63122e8cef5b833032d69d59a838559"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7f48aa7d60c65d3e6d5312c27f17d5525a245fb"
        }
      ],
      "title": "media: staging/ipu7: fix async notifier UAF on probe error path",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89522",
    "datePublished": "2026-09-11T19:44:04.052Z",
    "dateReserved": "2026-09-11T19:38:34.718Z",
    "dateUpdated": "2026-10-19T08:48:13.544Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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