CVE-2026-53400

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or\nuse-after-free.\n\nNote that the i2c-dev chardev, which is registered from a bus notifier,\ncurrently uses i2c_get_adapter() so the adapter needs to be added to the\nIDR before registration."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The flaw is reached through local kernel I2C adapter registration/lookup paths (module load, hotplug, concurrent probe) and userspace access to /dev/i2c-* via open(); there is no remote network entry point to i2c_get_adapter().\nAC:L - An attacker can repeatedly trigger adapter registration (e.g., modprobe/rmmod of I2C drivers, USB hotplug) while concurrently driving i2c_get_adapter() lookups, controlling both sides of the race window rather than depending on uncontrollable timing.\nPR:L - Exploitation requires a local unprivileged user with basic capabilities such as membership in the i2c group 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{"bugzilla": {"description": "kernel: i2c: core: fix adapter registration race", "id": "2502199", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502199"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-824", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ni2c: core: fix adapter registration race\nAdapters can be looked up based on their id using i2c_get_adapter()\nwhich takes a reference to the embedded struct device.\nMake sure that the adapter (including its struct device) has been\ninitialised before adding it to the IDR to avoid accessing uninitialised\ndata which could, for example, lead to NULL-pointer dereferences or\nuse-after-free.\nNote that the i2c-dev chardev, which is registered from a bus notifier,\ncurrently uses i2c_get_adapter() so the adapter needs to be added to the\nIDR before registration.", "A flaw was found in the Linux kernel, specifically within its I2C (Inter-Integrated Circuit) core component. This vulnerability arises from a timing issue during the registration of I2C adapters, where an adapter could be accessed before it is fully prepared. This premature access to uninitialized data may lead to system instability, crashes, or a denial of service (DoS)."], "name": "CVE-2026-53400", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-53400\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-53400\nhttps://lore.kernel.org/linux-cve-announce/2026071958-CVE-2026-53400-1a67@gregkh/T"], "threat_severity": "Moderate"}

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