-

CVE-2026-89983

i2c: core: fix debugfs UAF on adapter removal

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version 0e8926abfd7aee220e44be5566affd7a8580b50e
Version < dc33a9762538b3250ed6b5644a4d44c748be33a6
Status affected
Version e2a268b0f512fb18ae5961b1fdfaf610ed6bd661
Version < 1f1bcd4eca6caa3e4258d9a31925112539406eb6
Status affected
Version 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e
Version < f9094ace03e0a532cc6505d2e97b61ae738da4ed
Status affected
Version 73febd775bdbdb98c81255ff85773ac410ded5c4
Version < 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b
Status affected
Version 73febd775bdbdb98c81255ff85773ac410ded5c4
Version < 112b3d48084c820bbccf41d9783fd122e3ac4cb0
Status affected
Version 73febd775bdbdb98c81255ff85773ac410ded5c4
Version < 552836be2d95c688eede6371f85532abe1a71232
Status affected
Version 73febd775bdbdb98c81255ff85773ac410ded5c4
Version < b15b548d52b43ba8ac4652bc2c7244a8dd1e9622
Status affected
Version 5.15.168
Version < 5.15.221
Status affected
Version 6.1.113
Version < 6.1.188
Status affected
Version 6.6.55
Version < 6.6.157
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 6.8
Status affected
Version 0
Version < 6.8
Status unaffected
Version <= 5.15.*
Version 5.15.221
Status unaffected
Version <= 6.1.*
Version 6.1.188
Status unaffected
Version <= 6.6.*
Version 6.6.157
Status unaffected
Version <= 6.12.*
Version 6.12.110
Status unaffected
Version <= 6.18.*
Version 6.18.51
Status unaffected
Version <= 7.2.*
Version 7.2.5
Status unaffected
Version <= *
Version 7.3-rc1
Status unaffected
VulnDex Vulnerability Enrichment
Diese Information steht angemeldeten Benutzern zur Verfügung. Login Login
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.21% 0.11
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Es wurden noch keine Informationen zu CWE veröffentlicht.
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