{"id":"CVE-2026-89983","revision":"6dca92555e2b4a0a8237158d23bfdd54","records":[{"revision":"6dca92555e2b4a0a8237158d23bfdd54","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89983","aliases":[],"title":"i2c: core: fix debugfs UAF on adapter removal","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: core: fix debugfs UAF on adapter removal\n\ni2c_del_adapter() frees the adapter's debugfs directory before it\nunregisters the adapter device, but the new_device sysfs attribute\nstays writable until device_del(). A write racing with removal still\nreaches i2c_device_probe(), which passes the freed adap->debugfs to\ndebugfs_create_dir() as the new client's parent:\n\n  BUG: KASAN: slab-use-after-free in lookup_noperm_common+0x407/0x430\n  Read of size 4 at addr ffff88803ef87810 by task syz.0.61/6090\n   lookup_noperm_common+0x407/0x430\n   simple_start_creating+0x9c/0x110\n   debugfs_start_creating+0xdb/0x1a0\n   debugfs_create_dir+0x24/0x350\n   i2c_device_probe+0x814/0xbf0\n\nIt's technically possible to create a client after i2c_deregister_clients\nhas run. That client will never be unregistered and make\nwait_for_completion hang.\n\nClose the window by removing the new_device attribute at the start of\ni2c_del_adapter(). device_remove_file() will drain any clients left.","state":0,"publishedAt":"2026-09-16T10:32:59.461+00:00","modifiedAt":"2026-10-19T08:55:57.766+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/i2c/i2c-core-base.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"0e8926abfd7aee220e44be5566affd7a8580b50e\",\n                            \"lessThan\": \"dc33a9762538b3250ed6b5644a4d44c748be33a6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e2a268b0f512fb18ae5961b1fdfaf610ed6bd661\",\n                            \"lessThan\": \"1f1bcd4eca6caa3e4258d9a31925112539406eb6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e\",\n                            \"lessThan\": \"f9094ace03e0a532cc6505d2e97b61ae738da4ed\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"73febd775bdbdb98c81255ff85773ac410ded5c4\",\n                            \"lessThan\": \"643fb872aa04342d27dbef52b2b3cf3fe71b2c7b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"73febd775bdbdb98c81255ff85773ac410ded5c4\",\n                            \"lessThan\": \"112b3d48084c820bbccf41d9783fd122e3ac4cb0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"73febd775bdbdb98c81255ff85773ac410ded5c4\",\n                            \"lessThan\": \"552836be2d95c688eede6371f85532abe1a71232\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"73febd775bdbdb98c81255ff85773ac410ded5c4\",\n                            \"lessThan\": \"b15b548d52b43ba8ac4652bc2c7244a8dd1e9622\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.15.168\",\n                            \"lessThan\": \"5.15.221\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.113\",\n                            \"lessThan\": \"6.1.188\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.55\",\n                            \"lessThan\": \"6.6.157\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/i2c/i2c-core-base.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89983","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89983","identifiers":["CVE-2026-89983"]},"retained":false,"historicalAffected":[]}],"coverage":[]}