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CVE-2026-89983

i2c: core: fix debugfs UAF on adapter removal

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, and 1 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 0e8926abfd7aee220e44be5566affd7a8580b50e · fixed in dc33a9762538b3250ed6b5644a4d44c748be33a6; From e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 · fixed in 1f1bcd4eca6caa3e4258d9a31925112539406eb6; From 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e · fixed in f9094ace03e0a532cc6505d2e97b61ae738da4ed; From 73febd775bdbdb98c81255ff85773ac410ded5c4 · fixed in 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b; From 73febd775bdbdb98c81255ff85773ac410ded5c4 · fixed in 112b3d48084c820bbccf41d9783fd122e3ac4cb0; From 73febd775bdbdb98c81255ff85773ac410ded5c4 · fixed in 552836be2d95c688eede6371f85532abe1a71232; From 73febd775bdbdb98c81255ff85773ac410ded5c4 · fixed in b15b548d52b43ba8ac4652bc2c7244a8dd1e9622; From 5.15.168 · fixed in 5.15.221; From 6.1.113 · fixed in 6.1.188; From 6.6.55 · fixed in 6.6.157

  • Linux Linux

    6.8

  • KernelLinux

    fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.8.0 · fixed in 6.18.51; From 6.13.0 · fixed in 7.2.5

References 7

git.kernel.org