CVE-2025-39713

{"id": "CVE-2025-39713", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.0}]}, "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": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac", "lessThan": "2964dbe631fd21ad7873b1752b895548d3c12496", "versionType": "git"}, {"status": "affected", "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac", "lessThan": "6aaef1a75985865d8c6c5b65fb54152060faba48", "versionType": "git"}, {"status": "affected", "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac", "lessThan": "fbc81e78d75bf28972bc22b1599559557b1a1b83", "versionType": "git"}, {"status": "affected", "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac", "lessThan": "3c3e33b7edca7a2d6a96801f287f9faeb684d655", "versionType": "git"}, {"status": "affected", "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac", "lessThan": "1c2769dc80255824542ea5a4ff1a07dcdeb1603f", "versionType": "git"}, {"status": "affected", "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac", "lessThan": "ed905fe7cba03cf22ae0b84cf1b73cd1c070423a", "versionType": "git"}, {"status": "affected", "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac", "lessThan": "ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59", "versionType": "git"}, {"status": "affected", "version": "0f314f6c2e77beb1a232be21dd6be4e1849ba5ac", "lessThan": "7af160aea26c7dc9e6734d19306128cce156ec40", "versionType": "git"}], "programFiles": ["drivers/media/cec/usb/rainshadow/rainshadow-cec.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.12"}, {"status": "unaffected", "version": "0", "lessThan": "4.12", "versionType": "semver"}, {"status": "unaffected", "version": "5.4.297", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.241", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.190", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.149", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.103", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.44", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.16.4", "versionType": "semver", "lessThanOrEqual": "6.16.*"}, {"status": "unaffected", "version": "6.17", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/media/cec/usb/rainshadow/rainshadow-cec.c"], "defaultStatus": "affected"}]}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "affectedData": [{"vendor": "Siemens", "product": "SIMATIC CN 4100", "versions": [{"status": "affected", "version": "0", "lessThan": "V5.0", "versionType": "custom"}], "defaultStatus": "unknown"}]}], "published": "2025-09-05T18:15:48.720", "references": [{"url": "https://git.kernel.org/stable/c/1c2769dc80255824542ea5a4ff1a07dcdeb1603f", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/2964dbe631fd21ad7873b1752b895548d3c12496", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3c3e33b7edca7a2d6a96801f287f9faeb684d655", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6aaef1a75985865d8c6c5b65fb54152060faba48", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7af160aea26c7dc9e6734d19306128cce156ec40", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ed905fe7cba03cf22ae0b84cf1b73cd1c070423a", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fbc81e78d75bf28972bc22b1599559557b1a1b83", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ff9dd3db6cd4c6b54a2ecbc58151bea4ec63bc59", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html", "tags": ["Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html", "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-367"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rainshadow-cec: fix TOCTOU race condition in rain_interrupt()\n\nIn the interrupt handler rain_interrupt(), the buffer full check on\nrain->buf_len is performed before acquiring rain->buf_lock. This\ncreates a Time-of-Check to Time-of-Use (TOCTOU) race condition, as\nrain->buf_len is concurrently accessed and modified in the work\nhandler rain_irq_work_handler() under the same lock.\n\nMultiple interrupt invocations can race, with each reading buf_len\nbefore it becomes full and then proceeding. This can lead to both\ninterrupts attempting to write to the buffer, incrementing buf_len\nbeyond its capacity (DATA_SIZE) and causing a buffer overflow.\n\nFix this bug by moving the spin_lock() to before the buffer full\ncheck. This ensures that the check and the subsequent buffer modification\nare performed atomically, preventing the race condition. An corresponding\nspin_unlock() is added to the overflow path to correctly release the\nlock.\n\nThis possible bug was found by an experimental static analysis tool\ndeveloped by our team."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmedia: rainshadow-cec: correcci\u00f3n de una condici\u00f3n de carrera TOCTOU en rain_interrupt()\n\nEn el gestor de interrupciones rain_interrupt(), la comprobaci\u00f3n de b\u00fafer lleno en rain->buf_len se realiza antes de adquirir rain->buf_lock. Esto crea una condici\u00f3n de carrera de Tiempo de Comprobaci\u00f3n a Tiempo de Uso (TOCTOU), ya que rain->buf_len es accedido y modificado concurrentemente en el gestor de trabajo rain_irq_work_handler() bajo el mismo bloqueo.\n\nM\u00faltiples invocaciones de interrupci\u00f3n pueden competir, con cada una leyendo buf_len antes de que se llene y luego procediendo. Esto puede llevar a que ambas interrupciones intenten escribir en el b\u00fafer, incrementando buf_len m\u00e1s all\u00e1 de su capacidad (DATA_SIZE) y causando un desbordamiento de b\u00fafer.\n\nSe corrige este error moviendo el spin_lock() a antes de la comprobaci\u00f3n de b\u00fafer lleno. Esto asegura que la comprobaci\u00f3n y la modificaci\u00f3n posterior del b\u00fafer se realicen at\u00f3micamente, previniendo la condici\u00f3n de carrera. Se a\u00f1ade un spin_unlock() correspondiente a la ruta de desbordamiento para liberar correctamente el bloqueo.\n\nEste posible error fue encontrado por una herramienta experimental de an\u00e1lisis est\u00e1tico desarrollada por nuestro equipo."}], "lastModified": "2026-10-19T21:10:00.160", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "144D92B8-B97B-48A8-BE92-69815886F4F1", "versionEndExcluding": "5.4.297", "versionStartIncluding": "4.12"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D0D21C35-EB8A-488A-BBF9-403E4817E5DD", "versionEndExcluding": "5.10.241", "versionStartIncluding": "5.5"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AD9E597F-3DDE-4D7E-976C-463D0611F13F", "versionEndExcluding": "5.15.190", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FDBE8280-8983-4D2D-943D-2E6D0104E2D8", "versionEndExcluding": "6.1.149", "versionStartIncluding": "5.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F2293654-7169-49B5-8D0D-EE51EF8B8E48", "versionEndExcluding": "6.6.103", "versionStartIncluding": "6.2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "12351F24-1133-4775-960C-F2B47E81298B", "versionEndExcluding": "6.12.44", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "AFC28995-B8C3-4B68-8CB6-78E792B6629D", "versionEndExcluding": "6.16.4", "versionStartIncluding": "6.13"}], "operator": "OR"}]}, {"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FA6FEEC2-9F11-4643-8827-749718254FED"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}