CVE-2026-89983 (GCVE-0-2026-89983)
Vulnerability from cvelistv5 – Published: 2026-09-16 10:32 – Updated: 2026-09-16 10:32
VLAI
EPSS
VEX
Title
i2c: core: fix debugfs UAF on adapter removal
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.
Severity
No CVSS data available.
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
0e8926abfd7aee220e44be5566affd7a8580b50e , < dc33a9762538b3250ed6b5644a4d44c748be33a6
(git)
Affected: e2a268b0f512fb18ae5961b1fdfaf610ed6bd661 , < 1f1bcd4eca6caa3e4258d9a31925112539406eb6 (git) Affected: 4a2be5a72865bdd219b2d8c327b9fa03e87a4a9e , < f9094ace03e0a532cc6505d2e97b61ae738da4ed (git) Affected: 73febd775bdbdb98c81255ff85773ac410ded5c4 , < 643fb872aa04342d27dbef52b2b3cf3fe71b2c7b (git) Affected: 73febd775bdbdb98c81255ff85773ac410ded5c4 , < 112b3d48084c820bbccf41d9783fd122e3ac4cb0 (git) Affected: 73febd775bdbdb98c81255ff85773ac410ded5c4 , < 552836be2d95c688eede6371f85532abe1a71232 (git) Affected: 73febd775bdbdb98c81255ff85773ac410ded5c4 , < b15b548d52b43ba8ac4652bc2c7244a8dd1e9622 (git) Affected: 5.15.168 , < 5.15.221 (semver) Affected: 6.1.113 , < 6.1.188 (semver) Affected: 6.6.55 , < 6.6.157 (semver) |
guessed | |
| Linux | Linux |
Affected:
6.8
Unaffected: 0 , < 6.8 (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.51 , ≤ 6.18.* (semver) Unaffected: 7.2.5 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/i2c/i2c-core-base.c"
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},
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{
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},
{
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"versionType": "git"
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{
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"status": "affected",
"version": "73febd775bdbdb98c81255ff85773ac410ded5c4",
"versionType": "git"
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{
"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"
}
]
},
{
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"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",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.6.55",
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},
{
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},
{
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},
{
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"versionEndExcluding": "7.2.5",
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},
{
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}
],
"negate": false,
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"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\u0027s 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-\u003edebugfs to\ndebugfs_create_dir() as the new client\u0027s 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\u0027s 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": {
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}
}
},
"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",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-89983\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T11:17:09.270\",\"lastModified\":\"2026-09-16T11:17:09.270\",\"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\u0027s 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-\u003edebugfs to\\ndebugfs_create_dir() as the new client\u0027s 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\u0027s 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\"},{\"version\":\"73febd775bdbdb98c81255ff85773ac410ded5c4\",\"lessThan\":\"643fb872aa04342d27dbef52b2b3cf3fe71b2c7b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"73febd775bdbdb98c81255ff85773ac410ded5c4\",\"lessThan\":\"112b3d48084c820bbccf41d9783fd122e3ac4cb0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"73febd775bdbdb98c81255ff85773ac410ded5c4\",\"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\"},{\"version\":\"6.6.55\",\"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-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/112b3d48084c820bbccf41d9783fd122e3ac4cb0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1f1bcd4eca6caa3e4258d9a31925112539406eb6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/552836be2d95c688eede6371f85532abe1a71232\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dc33a9762538b3250ed6b5644a4d44c748be33a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9094ace03e0a532cc6505d2e97b61ae738da4ed\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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