i2c: core: fix adapter registration race
In the Linux kernel, the following vulnerability has been resolved: i2c: core: fix adapter registration race Adapters can be looked up based on their id using i2c_get_adapter() which takes a reference to the embedded struct device. Make sure that the adapter (including its struct device) has been initialised before adding it to the IDR to avoid accessing uninitialised data which could, for example, lead to NULL-pointer dereferences or use-after-free. Note that the i2c-dev chardev, which is registered from a bus notifier, currently uses i2c_get_adapter() so the adapter needs to be added to the IDR before registration.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.261, 5.15.212, 6.1.178, 6.12.95, 6.18.38, 6.6.145, 7.1.3
- CVEs
- CVE-2026-53400
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 02:02 UTC · Revision 1
Source evidence
In the Linux kernel, the following vulnerability has been resolved: i2c: core: fix adapter registration race Adapters can be looked up based on their id using i2c_get_adapter() which takes a reference to the embedded struct device. Make sure that the adapter (including its struct device) has been initialised before adding it to the IDR to avoid accessing uninitialised data which could, for example, lead to NULL-pointer dereferences or use-after-free. Note that the i2c-dev chardev, which is registered from a bus notifier, currently uses i2c_get_adapter() so the adapter needs to be added to the IDR before registration.
osv:CVE-2026-53400
Kernel
Fixed versions: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.95, 6.18.38, 7.1.3
Complete source record
{
"id": "6fd9c7ce8d74502849dcf07b1597873ca52b7b13c00d108614b9b29171d5879f",
"url": "https://osv.dev/vulnerability/CVE-2026-53400",
"method": "structured",
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"title": "i2c: core: fix adapter registration race",
"summary": "In the Linux kernel, the following vulnerability has been resolved: i2c: core: fix adapter registration race Adapters can be looked up based on their id using i2c_get_adapter() which takes a reference to the embedded struct device. Make sure that the adapter (including its struct device) has been initialised before adding it to the IDR to avoid accessing uninitialised data which could, for example, lead to NULL-pointer dereferences or use-after-free. Note that the i2c-dev chardev, which is registered from a bus notifier, currently uses i2c_get_adapter() so the adapter needs to be added to the IDR before registration.",
"evidence": "osv:CVE-2026-53400",
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"modified": "2026-10-28T02:30:48.898370029Z",
"provider": "osv",
"references": [
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"https://cert-portal.siemens.com/productcert/html/ssa-457936.html",
"https://git.kernel.org/stable/c/1febb174815bcae56d73587e99e8f87e02f0784d",
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"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53400.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-53400",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"provider_metadata": {
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"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53400.json"
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"related_cves": [
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 517203,
"published_at": "2026-07-19T12:02:00.632+00:00"
}