{"id":"CVE-2025-38682","summary":"i2c: core: Fix double-free of fwnode in i2c_unregister_device()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ni2c: core: Fix double-free of fwnode in i2c_unregister_device()\n\nBefore commit df6d7277e552 (\"i2c: core: Do not dereference fwnode in struct\ndevice\"), i2c_unregister_device() only called fwnode_handle_put() on\nof_node-s in the form of calling of_node_put(client-\u003edev.of_node).\n\nBut after this commit the i2c_client's fwnode now unconditionally gets\nfwnode_handle_put() on it.\n\nWhen the i2c_client has no primary (ACPI / OF) fwnode but it does have\na software fwnode, the software-node will be the primary node and\nfwnode_handle_put() will put() it.\n\nBut for the software fwnode device_remove_software_node() will also put()\nit leading to a double free:\n\n[   82.665598] ------------[ cut here ]------------\n[   82.665609] refcount_t: underflow; use-after-free.\n[   82.665808] WARNING: CPU: 3 PID: 1502 at lib/refcount.c:28 refcount_warn_saturate+0xba/0x11\n...\n[   82.666830] RIP: 0010:refcount_warn_saturate+0xba/0x110\n...\n[   82.666962]  \u003cTASK\u003e\n[   82.666971]  i2c_unregister_device+0x60/0x90\n\nFix this by not calling fwnode_handle_put() when the primary fwnode is\na software-node.","modified":"2026-04-02T12:48:05.031240Z","published":"2025-09-04T15:32:37.403Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38682.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1c24e5fc0c7096e00c202a6a3e0c342c1afb47c2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ffe02f7c4e36090154646612e67d331832f92037"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38682.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38682"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"df6d7277e5525d6cce63127dd93ebec4c6354fa0"},{"fixed":"ffe02f7c4e36090154646612e67d331832f92037"},{"fixed":"1c24e5fc0c7096e00c202a6a3e0c342c1afb47c2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38682.json"}}],"schema_version":"1.7.5"}