CVE-2026-31433

{"id": "CVE-2026-31433", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/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": 2.8}]}, "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": "f2283680a80571ca82d710bc6ecd8f8beac67d63", "lessThan": "3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7", "versionType": "git"}, {"status": "affected", "version": "9f297df20d93411c0b4ddad7f88ba04a7cd36e77", "lessThan": "4cca3eff2099b18672934a39cee70aed835d652c", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "7aec5a769d2356cbf344d85bcfd36de592ac96a5", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "b0cd9725fe2bcc9f37d096b132318a9060373f5d", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "9d7032851d6f5adbe2739601ca456c0ad3b422f0", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "beef2634f81f1c086208191f7228bce1d366493d", "versionType": "git"}, {"status": "affected", "version": "5.15.145", "lessThan": "5.15.203", "versionType": "semver"}, {"status": "affected", "version": "6.1.71", "lessThan": "6.1.168", "versionType": "semver"}], "programFiles": ["fs/smb/server/smb2pdu.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.6"}, {"status": "unaffected", "version": "0", "lessThan": "6.6", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.168", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.131", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.80", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.21", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.11", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/smb2pdu.c"], "defaultStatus": "affected"}]}], "published": "2026-04-22T09:16:21.573", "references": [{"url": "https://git.kernel.org/stable/c/358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4cca3eff2099b18672934a39cee70aed835d652c", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/7aec5a769d2356cbf344d85bcfd36de592ac96a5", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9d7032851d6f5adbe2739601ca456c0ad3b422f0", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/b0cd9725fe2bcc9f37d096b132318a9060373f5d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/beef2634f81f1c086208191f7228bce1d366493d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-125"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix potencial OOB in get_file_all_info() for compound requests\n\nWhen a compound request consists of QUERY_DIRECTORY + QUERY_INFO\n(FILE_ALL_INFORMATION) and the first command consumes nearly the entire\nmax_trans_size, get_file_all_info() would blindly call smbConvertToUTF16()\nwith PATH_MAX, causing out-of-bounds write beyond the response buffer.\nIn get_file_all_info(), there was a missing validation check for\nthe client-provided OutputBufferLength before copying the filename into\nFileName field of the smb2_file_all_info structure.\nIf the filename length exceeds the available buffer space, it could lead to\npotential buffer overflows or memory corruption during smbConvertToUTF16\nconversion. This calculating the actual free buffer size using\nsmb2_calc_max_out_buf_len() and returning -EINVAL if the buffer is\ninsufficient and updating smbConvertToUTF16 to use the actual filename\nlength (clamped by PATH_MAX) to ensure a safe copy operation."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: corregir potencial OOB en get_file_all_info() para solicitudes compuestas\n\nCuando una solicitud compuesta consiste en QUERY_DIRECTORY + QUERY_INFO (FILE_ALL_INFORMATION) y el primer comando consume casi la totalidad de max_trans_size, get_file_all_info() llamar\u00eda ciegamente a smbConvertToUTF16() con PATH_MAX, causando una escritura fuera de l\u00edmites m\u00e1s all\u00e1 del b\u00fafer de respuesta. En get_file_all_info(), faltaba una verificaci\u00f3n de validaci\u00f3n para el OutputBufferLength proporcionado por el cliente antes de copiar el nombre de archivo en el campo FileName de la estructura smb2_file_all_info. Si la longitud del nombre de archivo excede el espacio de b\u00fafer disponible, podr\u00eda conducir a potenciales desbordamientos de b\u00fafer o corrupci\u00f3n de memoria durante la conversi\u00f3n smbConvertToUTF16. Esto calculando el tama\u00f1o real del b\u00fafer libre usando smb2_calc_max_out_buf_len() y devolviendo -EINVAL si el b\u00fafer es insuficiente y actualizando smbConvertToUTF16 para usar la longitud real del nombre de archivo (limitada por PATH_MAX) para asegurar una operaci\u00f3n de copia segura."}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "120A3FBD-C86A-46F6-BD23-D862D4C6E574", "versionEndExcluding": "5.15.203", "versionStartIncluding": "5.15.145"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C6118D40-41D5-46EF-9C28-382159147BC9", "versionEndExcluding": "6.1.168", "versionStartIncluding": "6.1.71"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2DC0D2CD-6CF8-469A-B3F5-E48375FDA274", "versionEndExcluding": "6.6.131", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "97EB19EC-A11E-49C6-9D2F-6F6EC6CB98B6", "versionEndExcluding": "6.12.80", "versionStartIncluding": "6.7"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "ED39847A-3B46-4729-B7CA-B2C30B9FA8FE", "versionEndExcluding": "6.18.21", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4CA2E747-A9EC-4518-9AA2-B4247FC748B7", "versionEndExcluding": "6.19.11", "versionStartIncluding": "6.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}