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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-89983

i2c: core: fix debugfs UAF on adapter removal

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 0e8926abfd7aee220e44be5566affd7a8580b50e to < dc33a9762538b3250ed6b5644a4d44c748be33a6affected
  • e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 to < 1f1bcd4eca6caa3e4258d9a31925112539406eb6affected
  • 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e to < f9094ace03e0a532cc6505d2e97b61ae738da4edaffected
  • 73febd775bdbdb98c81255ff85773ac410ded5c4 to < 643fb872aa04342d27dbef52b2b3cf3fe71b2c7baffected
  • 73febd775bdbdb98c81255ff85773ac410ded5c4 to < 112b3d48084c820bbccf41d9783fd122e3ac4cb0affected
  • 73febd775bdbdb98c81255ff85773ac410ded5c4 to < 552836be2d95c688eede6371f85532abe1a71232affected
  • 73febd775bdbdb98c81255ff85773ac410ded5c4 to < b15b548d52b43ba8ac4652bc2c7244a8dd1e9622affected
  • 5.15.168 to < 5.15.221affected
  • 6.1.113 to < 6.1.188affected
  • 6.6.55 to < 6.6.157affected

Linux Linux

Default version status: affected

  • 6.8affected
  • 0 to < 6.8unaffected
  • 5.15.221 to ≤ 5.15.*unaffected
  • 6.1.188 to ≤ 6.1.*unaffected
  • 6.6.157 to ≤ 6.6.*unaffected
  • 6.12.110 to ≤ 6.12.*unaffected
  • 6.18.51 to ≤ 6.18.*unaffected
  • 7.2.5 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References