CVE-2025-38682

{"id": "CVE-2025-38682", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "df6d7277e5525d6cce63127dd93ebec4c6354fa0", "lessThan": "ffe02f7c4e36090154646612e67d331832f92037", "versionType": "git"}, {"status": "affected", "version": "df6d7277e5525d6cce63127dd93ebec4c6354fa0", "lessThan": "1c24e5fc0c7096e00c202a6a3e0c342c1afb47c2", "versionType": "git"}], "programFiles": ["drivers/i2c/i2c-core-base.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"status": "unaffected", "version": "0", "lessThan": "6.16", "versionType": "semver"}, {"status": "unaffected", "version": "6.16.2", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/i2c/i2c-core-base.c"], "defaultStatus": "affected"}]}], "published": "2025-09-04T16:15:35.910", "references": [{"url": "https://git.kernel.org/stable/c/1c24e5fc0c7096e00c202a6a3e0c342c1afb47c2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ffe02f7c4e36090154646612e67d331832f92037", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-415"}]}], "descriptions": [{"lang": "en", "value": "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->dev.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] <TASK>\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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ni2c: core: Correcci\u00f3n de doble liberaci\u00f3n de fwnode en i2c_unregister_device()\n\nAntes del commit df6d7277e552 ('i2c: core: No desreferenciar fwnode en struct device'), i2c_unregister_device() solo llamaba a fwnode_handle_put() en los of_node en la forma de llamar a of_node_put(client->dev.of_node).\n\nPero despu\u00e9s de este commit, el fwnode del i2c_client ahora recibe incondicionalmente fwnode_handle_put() sobre \u00e9l.\n\nCuando el i2c_client no tiene un fwnode primario (ACPI / OF) pero s\u00ed tiene un fwnode de software, el nodo de software ser\u00e1 el nodo primario y fwnode_handle_put() lo liberar\u00e1.\n\nPero para el fwnode de software, device_remove_software_node() tambi\u00e9n lo liberar\u00e1, lo que lleva a una doble liberaci\u00f3n:\n\n[ 82.665598] ------------[ cut here ]------------\n[ 82.665609] refcount_t: desbordamiento inferior; uso despu\u00e9s de liberaci\u00f3n.\n[ 82.665808] ADVERTENCIA: CPU: 3 PID: 1502 en lib/refcount.c:28 refcount_warn_saturate+0xba/0x11\n...\n[ 82.666830] RIP: 0010:refcount_warn_saturate+0xba/0x110\n...\n[ 82.666962] <TAREA>\n[ 82.666971] i2c_unregister_device+0x60/0x90\n\nSolucione esto al no llamar a fwnode_handle_put() cuando el fwnode primario es un nodo de software."}], "lastModified": "2026-10-19T21:10:00.160", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "BD7C087D-2415-4521-B624-30003352F899", "versionEndExcluding": "6.16.2", "versionStartIncluding": "6.16"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}