CVE-2026-89983i2c: core: fix debugfs UAF on adapter removal
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 0e8926abfd7aee220e44be5566affd7a8580b50e before dc33a9762538b3250ed6b5644a4d44c748be33a6; from e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 before 1f1bcd4eca6caa3e4258d9a31925112539406eb6; from 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e before f9094ace03e0a532cc6505d2e97b61ae738da4ed; from 73febd775bdbdb98c81255ff85773ac410ded5c4 before 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b; from 73febd775bdbdb98c81255ff85773ac410ded5c4 before 112b3d48084c820bbccf41d9783fd122e3ac4cb0; from 73febd775bdbdb98c81255ff85773ac410ded5c4 before 552836be2d95c688eede6371f85532abe1a71232; from 73febd775bdbdb98c81255ff85773ac410ded5c4 before b15b548d52b43ba8ac4652bc2c7244a8dd1e9622; from 5.15.168 before 5.15.221; and 2 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6
- https://git.kernel.org/stable/c/1f1bcd4eca6caa3e4258d9a31925112539406eb6
- https://git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed
- https://git.kernel.org/stable/c/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b
- https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0
- https://git.kernel.org/stable/c/552836be2d95c688eede6371f85532abe1a71232
- https://git.kernel.org/stable/c/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.