i2c: core: fix debugfs UAF on adapter removal

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89983
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:09 UTC
Updated2026-09-16 11:17:09 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0e8926abfd7aee220e44be5566affd7a8580b50e dc33a9762538b3250ed6b5644a4d44c748be33a6 git Not specified
CNA Linux Linux affected e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 1f1bcd4eca6caa3e4258d9a31925112539406eb6 git Not specified
CNA Linux Linux affected 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e f9094ace03e0a532cc6505d2e97b61ae738da4ed git Not specified
CNA Linux Linux affected 73febd775bdbdb98c81255ff85773ac410ded5c4 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b git Not specified
CNA Linux Linux affected 73febd775bdbdb98c81255ff85773ac410ded5c4 112b3d48084c820bbccf41d9783fd122e3ac4cb0 git Not specified
CNA Linux Linux affected 73febd775bdbdb98c81255ff85773ac410ded5c4 552836be2d95c688eede6371f85532abe1a71232 git Not specified
CNA Linux Linux affected 73febd775bdbdb98c81255ff85773ac410ded5c4 b15b548d52b43ba8ac4652bc2c7244a8dd1e9622 git Not specified
CNA Linux Linux affected 5.15.168 5.15.221 semver Not specified
CNA Linux Linux affected 6.1.113 6.1.188 semver Not specified
CNA Linux Linux affected 6.6.55 6.6.157 semver Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1f1bcd4eca6caa3e4258d9a31925112539406eb6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/552836be2d95c688eede6371f85532abe1a71232 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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