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i2c: core: fix debugfs UAF on adapter removal

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: i2c: core: fix debugfs UAF on adapter removal i2c_del_adapter() frees the adapter's debugfs directory before it unregisters the adapter device, but the new_device sysfs attribute stays writable until device_del(). A write racing with removal still reaches i2c_device_probe(), which passes the freed adap->debugfs to debugfs_create_dir() as the new client's parent: BUG: KASAN: slab-use-after-free in lookup_noperm_common+0x407/0x430 Read of size 4 at addr ffff88803ef87810 by task syz.0.61/6090 lookup_noperm_common+0x407/0x430 simple_start_creating+0x9c/0x110 debugfs_start_creating+0xdb/0x1a0 debugfs_create_dir+0x24/0x350 i2c_device_probe+0x814/0xbf0 It's technically possible to create a client after i2c_deregister_clients has run. That client will never be unregistered and make wait_for_completion hang. Close the window by removing the new_device attribute at the start of i2c_del_adapter(). device_remove_file() will drain any clients left.

Announced Source revision 1
Original source ↗

CVE-2026-89983

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89983

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "0e8926abfd7aee220e44be5566affd7a8580b50e",
        "lessThan": "dc33a9762538b3250ed6b5644a4d44c748be33a6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e2a268b0f512fb18ae5961b1fdfaf610ed6bd661",
        "lessThan": "1f1bcd4eca6caa3e4258d9a31925112539406eb6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e",
        "lessThan": "f9094ace03e0a532cc6505d2e97b61ae738da4ed",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73febd775bdbdb98c81255ff85773ac410ded5c4",
        "lessThan": "643fb872aa04342d27dbef52b2b3cf3fe71b2c7b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73febd775bdbdb98c81255ff85773ac410ded5c4",
        "lessThan": "112b3d48084c820bbccf41d9783fd122e3ac4cb0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73febd775bdbdb98c81255ff85773ac410ded5c4",
        "lessThan": "552836be2d95c688eede6371f85532abe1a71232",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "73febd775bdbdb98c81255ff85773ac410ded5c4",
        "lessThan": "b15b548d52b43ba8ac4652bc2c7244a8dd1e9622",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.15.168",
        "lessThan": "5.15.221",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.1.113",
        "lessThan": "6.1.188",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.6.55",
        "lessThan": "6.6.157",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/i2c/i2c-core-base.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/i2c/i2c-core-base.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89983

Source reference: /cveMetadata/cveId

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Event
#36419 · Revision 1
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