{"api_version":"1","generated_at":"2026-10-02T15:13:36+00:00","cve":"CVE-2026-89983","urls":{"html":"https://cve.report/CVE-2026-89983","api":"https://cve.report/api/cve/CVE-2026-89983.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89983","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89983"},"summary":{"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":"PUBLISHED","assigner":"Linux","published_at":"2026-09-16 11:17:09","updated_at":"2026-09-16 11:17:09"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1f1bcd4eca6caa3e4258d9a31925112539406eb6","name":"https://git.kernel.org/stable/c/1f1bcd4eca6caa3e4258d9a31925112539406eb6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b","name":"https://git.kernel.org/stable/c/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed","name":"https://git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622","name":"https://git.kernel.org/stable/c/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6","name":"https://git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/552836be2d95c688eede6371f85532abe1a71232","name":"https://git.kernel.org/stable/c/552836be2d95c688eede6371f85532abe1a71232","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0","name":"https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89983","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89983","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 0e8926abfd7aee220e44be5566affd7a8580b50e dc33a9762538b3250ed6b5644a4d44c748be33a6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 1f1bcd4eca6caa3e4258d9a31925112539406eb6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e f9094ace03e0a532cc6505d2e97b61ae738da4ed git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 73febd775bdbdb98c81255ff85773ac410ded5c4 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 73febd775bdbdb98c81255ff85773ac410ded5c4 112b3d48084c820bbccf41d9783fd122e3ac4cb0 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 73febd775bdbdb98c81255ff85773ac410ded5c4 552836be2d95c688eede6371f85532abe1a71232 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 73febd775bdbdb98c81255ff85773ac410ded5c4 b15b548d52b43ba8ac4652bc2c7244a8dd1e9622 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.168 5.15.221 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.1.113 6.1.188 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.6.55 6.6.157 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.8","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.8 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.5 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/i2c/i2c-core-base.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"dc33a9762538b3250ed6b5644a4d44c748be33a6","status":"affected","version":"0e8926abfd7aee220e44be5566affd7a8580b50e","versionType":"git"},{"lessThan":"1f1bcd4eca6caa3e4258d9a31925112539406eb6","status":"affected","version":"e2a268b0f512fb18ae5961b1fdfaf610ed6bd661","versionType":"git"},{"lessThan":"f9094ace03e0a532cc6505d2e97b61ae738da4ed","status":"affected","version":"4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e","versionType":"git"},{"lessThan":"643fb872aa04342d27dbef52b2b3cf3fe71b2c7b","status":"affected","version":"73febd775bdbdb98c81255ff85773ac410ded5c4","versionType":"git"},{"lessThan":"112b3d48084c820bbccf41d9783fd122e3ac4cb0","status":"affected","version":"73febd775bdbdb98c81255ff85773ac410ded5c4","versionType":"git"},{"lessThan":"552836be2d95c688eede6371f85532abe1a71232","status":"affected","version":"73febd775bdbdb98c81255ff85773ac410ded5c4","versionType":"git"},{"lessThan":"b15b548d52b43ba8ac4652bc2c7244a8dd1e9622","status":"affected","version":"73febd775bdbdb98c81255ff85773ac410ded5c4","versionType":"git"},{"lessThan":"5.15.221","status":"affected","version":"5.15.168","versionType":"semver"},{"lessThan":"6.1.188","status":"affected","version":"6.1.113","versionType":"semver"},{"lessThan":"6.6.157","status":"affected","version":"6.6.55","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/i2c/i2c-core-base.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.8"},{"lessThan":"6.8","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.221","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.188","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.51","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"5.15.168","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"6.1.113","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"6.6.55","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.51","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.5","versionStartIncluding":"6.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-09-16T10:32:59.461Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6"},{"url":"https://git.kernel.org/stable/c/1f1bcd4eca6caa3e4258d9a31925112539406eb6"},{"url":"https://git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed"},{"url":"https://git.kernel.org/stable/c/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b"},{"url":"https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0"},{"url":"https://git.kernel.org/stable/c/552836be2d95c688eede6371f85532abe1a71232"},{"url":"https://git.kernel.org/stable/c/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622"}],"title":"i2c: core: fix debugfs UAF on adapter removal","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89983","datePublished":"2026-09-16T10:32:59.461Z","dateReserved":"2026-09-11T19:38:34.779Z","dateUpdated":"2026-09-16T10:32:59.461Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-16 11:17:09","lastModifiedDate":"2026-09-16 11:17:09","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89983","Ordinal":"1","Title":"i2c: core: fix debugfs UAF on adapter removal","CVE":"CVE-2026-89983","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89983","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"i2c: core: fix debugfs UAF on adapter removal"}]}}}