CVE-2025-39838

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NULL is passed to\n__cifs_sfu_make_node without checks, which passes it unchecked to\ncifs_strndup_to_utf16, which in turn passes it to\ncifs_local_to_utf16_bytes where '*from' is dereferenced, causing a crash.\n\nThis patch adds a check for NULL 'src' in cifs_strndup_to_utf16 and\nreturns NULL early to prevent dereferencing NULL pointer.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncifs: prevenir la desreferencia de puntero NULL en la conversi\u00f3n UTF16\n\nPuede haber un error de desreferencia de puntero NULL aqu\u00ed. Se pasa NULL a __cifs_sfu_make_node sin comprobaciones, que lo pasa sin comprobar a cifs_strndup_to_utf16, que a su vez lo pasa a cifs_local_to_utf16_bytes donde se desreferencia '*from', causando un fallo.\n\nEste parche a\u00f1ade una comprobaci\u00f3n para NULL 'src' en cifs_strndup_to_utf16 y devuelve NULL anticipadamente para prevenir la desreferencia del puntero NULL.\n\nEncontrado por Linux Verification Center (linuxtesting.org) con SVACE"}], "id": "CVE-2025-39838", "lastModified": "2026-11-05T22:17:33.577", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-39838", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-05T21:12:29.483732Z", "version": "2.0.3"}}]}, "published": "2025-09-19T16:15:42.457", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f797f062b5cf13a1c2bcc23285361baaa7c9260"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3c26a8d30ed6b53a52a023ec537dc50a6d34a67a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/70bccd9855dae56942f2b18a08ba137bb54093a0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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{"created": "2025-09-22T10:00:10.091085+00:00", "updated": "2025-09-22T10:06:28.813713+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}