{
  "affected": [
    {
      "ranges": [
        {
          "events": [
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              "introduced": "0e8926abfd7aee220e44be5566affd7a8580b50e"
            },
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
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          "type": "GIT"
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    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
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          ],
          "type": "ECOSYSTEM"
        },
        {
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              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.8.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
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              "fixed": "7.2.5"
            }
          ],
          "type": "ECOSYSTEM"
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  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89983.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: core: fix debugfs UAF on adapter removal\n\ni2c_del_adapter() frees the adapter's debugfs directory before it\nunregisters the adapter device, but the new_device sysfs attribute\nstays writable until device_del(). A write racing with removal still\nreaches i2c_device_probe(), which passes the freed adap-\u003edebugfs to\ndebugfs_create_dir() as the new client's parent:\n\n  BUG: KASAN: slab-use-after-free in lookup_noperm_common+0x407/0x430\n  Read of size 4 at addr ffff88803ef87810 by task syz.0.61/6090\n   lookup_noperm_common+0x407/0x430\n   simple_start_creating+0x9c/0x110\n   debugfs_start_creating+0xdb/0x1a0\n   debugfs_create_dir+0x24/0x350\n   i2c_device_probe+0x814/0xbf0\n\nIt's technically possible to create a client after i2c_deregister_clients\nhas run. That client will never be unregistered and make\nwait_for_completion hang.\n\nClose the window by removing the new_device attribute at the start of\ni2c_del_adapter(). device_remove_file() will drain any clients left.",
  "id": "CVE-2026-89983",
  "modified": "2026-09-17T03:30:48.060964127Z",
  "published": "2026-09-16T10:32:59.461Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f1bcd4eca6caa3e4258d9a31925112539406eb6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/552836be2d95c688eede6371f85532abe1a71232"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89983.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89983"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "i2c: core: fix debugfs UAF on adapter removal"
}