Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0e8926abfd7aee220e44be5566affd7a8580b50e before dc33a9762538b3250ed6b5644a4d44c748be33a6; affected e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 before 1f1bcd4eca6caa3e4258d9a31925112539406eb6; affected 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e before f9094ace03e0a532cc6505d2e97b61ae738da4ed; affected 73febd775bdbdb98c81255ff85773ac410ded5c4 before 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b; affected 73febd775bdbdb98c81255ff85773ac410ded5c4 before 112b3d48084c820bbccf41d9783fd122e3ac4cb0; affected 73febd775bdbdb98c81255ff85773ac410ded5c4 before 552836be2d95c688eede6371f85532abe1a71232; affected 73febd775bdbdb98c81255ff85773ac410ded5c4 before b15b548d52b43ba8ac4652bc2c7244a8dd1e9622; affected 5.15.168 before 5.15.221; affected 6.1.113 before 6.1.188; affected 6.6.55 before 6.6.157 |
| Linux / Linux | affected 6.8; unaffected 0 before 6.8; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
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