CVE-2026-89983
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.
How to fix
- Linux Linuxdc33a9762538b3250ed6b5644a4d44c748be33a6, 1f1bcd4eca6caa3e4258d9a31925112539406eb6, f9094ace03e0a532cc6505d2e97b61ae738da4ed, 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b, 112b3d48084c820bbccf41d9783fd122e3ac4cb0, 552836be2d95c688eede6371f85532abe1a71232, b15b548d52b43ba8ac4652bc2c7244a8dd1e9622, 5.15.221, 6.1.188, 6.6.157 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 0e8926abfd7aee220e44be5566affd7a8580b50e ≤ v < dc33a9762538b3250ed6b5644a4d44c748be33a6, e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 ≤ v < 1f1bcd4eca6caa3e4258d9a31925112539406eb6, 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e ≤ v < f9094ace03e0a532cc6505d2e97b61ae738da4ed, 73febd775bdbdb98c81255ff85773ac410ded5c4 ≤ v < 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b, 73febd775bdbdb98c81255ff85773ac410ded5c4 ≤ v < 112b3d48084c820bbccf41d9783fd122e3ac4cb0, 73febd775bdbdb98c81255ff85773ac410ded5c4 ≤ v < 552836be2d95c688eede6371f85532abe1a71232, 73febd775bdbdb98c81255ff85773ac410ded5c4 ≤ v < b15b548d52b43ba8ac4652bc2c7244a8dd1e9622, 5.15.168 ≤ v < 5.15.221, 6.1.113 ≤ v < 6.1.188, 6.6.55 ≤ v < 6.6.157, 6.8 | dc33a9762538b3250ed6b5644a4d44c748be33a6, 1f1bcd4eca6caa3e4258d9a31925112539406eb6, f9094ace03e0a532cc6505d2e97b61ae738da4ed, 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b, 112b3d48084c820bbccf41d9783fd122e3ac4cb0, 552836be2d95c688eede6371f85532abe1a71232, b15b548d52b43ba8ac4652bc2c7244a8dd1e9622, 5.15.221, 6.1.188, 6.6.157 |
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