CVE-2026-89983 (GCVE-0-2026-89983)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-10-19 08:55
VLAI
Title
i2c: core: fix debugfs UAF on adapter removal
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6847 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0e8926abfd7aee220e44be5566affd7a8580b50e , < dc33a9762538b3250ed6b5644a4d44c748be33a6 (git)
Affected: e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 , < 1f1bcd4eca6caa3e4258d9a31925112539406eb6 (git)
Affected: 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e , < f9094ace03e0a532cc6505d2e97b61ae738da4ed (git)
Affected: 73febd775bdbdb98c81255ff85773ac410ded5c4 , < 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b (git)
Affected: 73febd775bdbdb98c81255ff85773ac410ded5c4 , < 112b3d48084c820bbccf41d9783fd122e3ac4cb0 (git)
Affected: 73febd775bdbdb98c81255ff85773ac410ded5c4 , < 552836be2d95c688eede6371f85532abe1a71232 (git)
Affected: 73febd775bdbdb98c81255ff85773ac410ded5c4 , < b15b548d52b43ba8ac4652bc2c7244a8dd1e9622 (git)
Affected: 5.15.168 , < 5.15.221 (semver)
Affected: 6.1.113 , < 6.1.188 (semver)
Affected: 6.6.55 , < 6.6.157 (semver)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.51 , ≤ 6.18.* (semver)
Unaffected: 7.2.5 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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      "cve": "CVE-2026-89983",
      "id": "CVE-2026-89983",
      "initial_release_date": "2026-09-16T00:00:00+00:00",
      "product_status:known_affected": "77",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: i2c: core: fix debugfs UAF on adapter removal",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89983.json",
      "version": "3"
    },
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-20T00:52:34Z",
      "cve": "CVE-2026-89983",
      "id": "CVE-2026-89983",
      "initial_release_date": "2026-09-17T16:32:45Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "348",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89983",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-89983.json",
      "version": "4"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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