CVE-2026-89983
Full vulnerability record from the local CVENow database.
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.
Severity
Not scored
CVSS score
Not available
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-16 11:17:09.270000
Last modified
2026-10-19 09:18:45.237000
View original CVE JSON
{
"id": "CVE-2026-89983",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-09-16T11:17:09.270",
"lastModified": "2026-10-19T09:18:45.237",
"vulnStatus": "Received",
"cveTags": [],
"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."
}
],
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "unaffected",
"programFiles": [
"drivers/i2c/i2c-core-base.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "0e8926abfd7aee220e44be5566affd7a8580b50e",
"lessThan": "dc33a9762538b3250ed6b5644a4d44c748be33a6",
"versionType": "git",
"status": "affected"
},
{
"version": "e2a268b0f512fb18ae5961b1fdfaf610ed6bd661",
"lessThan": "1f1bcd4eca6caa3e4258d9a31925112539406eb6",
"versionType": "git",
"status": "affected"
},
{
"version": "4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e",
"lessThan": "f9094ace03e0a532cc6505d2e97b61ae738da4ed",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "643fb872aa04342d27dbef52b2b3cf3fe71b2c7b",
"versionType": "git",
"status": "affected"
},
{
"version": "73febd775bdbdb98c81255ff85773ac410ded5c4",
"lessThan": "112b3d48084c820bbccf41d9783fd122e3ac4cb0",
"versionType": "git",
"status": "affected"
},
{
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"lessThan": "552836be2d95c688eede6371f85532abe1a71232",
"versionType": "git",
"status": "affected"
},
{
"version": "73febd775bdbdb98c81255ff85773ac410ded5c4",
"lessThan": "b15b548d52b43ba8ac4652bc2c7244a8dd1e9622",
"versionType": "git",
"status": "affected"
},
{
"version": "5.15.168",
"lessThan": "5.15.221",
"versionType": "semver",
"status": "affected"
},
{
"version": "6.1.113",
"lessThan": "6.1.188",
"versionType": "semver",
"status": "affected"
},
{
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"lessThan": "6.6.157",
"versionType": "semver",
"status": "affected"
}
]
},
{
"vendor": "Linux",
"product": "Linux",
"defaultStatus": "affected",
"programFiles": [
"drivers/i2c/i2c-core-base.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"versions": [
{
"version": "6.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.8",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.12.110",
"lessThanOrEqual": "6.12.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "6.18.51",
"lessThanOrEqual": "6.18.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.2.5",
"lessThanOrEqual": "7.2.*",
"versionType": "semver",
"status": "unaffected"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"versionType": "original_commit_for_fix",
"status": "unaffected"
}
]
}
]
}
],
"metrics": {},
"references": [
{
"url": "https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
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},
{
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{
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{
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{
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{
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}
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}