CVE-2026-31433

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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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP port 445, directly reachable over the network by any SMB client.\nAC:L - The attacker can reliably construct a compound request (QUERY_DIRECTORY + QUERY_INFO) where the first command consumes most of the buffer, then trigger the OOB write in the second command with no race conditions or special prerequisites.\nPR:L - The vulnerability requires an authenticated SMB session and tree connection; smb2_check_user_session() and smb2_get_ksmbd_tcon() are enforced before QUERY_INFO is processed, so the attacker needs valid SMB credentials.\nUI:N - No user interaction is required; the attacker sends the malicious compound SMB request directly over the network.\nS:U - The vulnerability stays within the kernel security scope; there is no crossing of a security boundary like VM escape or sandbox escape.\nC:H - The out-of-bounds heap write of up to ~8KB of attacker-influenced data into kernel heap can be leveraged to corrupt adjacent objects and create read primitives for arbitrary kernel memory disclosure.\nI:H - The OOB heap write corrupts adjacent kernel heap objects with partially attacker-controlled data (UTF-16 filename), which can be exploited via heap shaping for arbitrary write primitives and code execution.\nA:H - The out-of-bounds write corrupts kernel heap memory, which will reliably cause kernel crashes or panics."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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"https://git.kernel.org/stable/c/b0cd9725fe2bcc9f37d096b132318a9060373f5d"}, {"url": "https://git.kernel.org/stable/c/9d7032851d6f5adbe2739601ca456c0ad3b422f0"}, {"url": "https://git.kernel.org/stable/c/beef2634f81f1c086208191f7228bce1d366493d"}], "title": "ksmbd: fix potencial OOB in get_file_all_info() for compound requests", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

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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."}], "id": "CVE-2026-31433", "lastModified": "2026-11-11T23:10:00.263", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-04-22T09:16:21.573", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/358cdaa1f7fbf2712cb4c5f6b59cb9a5c673c5fe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3a852f9d1c981fb14f6bf4e24999e0ea8088a7d7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cca3eff2099b18672934a39cee70aed835d652c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7aec5a769d2356cbf344d85bcfd36de592ac96a5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/9d7032851d6f5adbe2739601ca456c0ad3b422f0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/b0cd9725fe2bcc9f37d096b132318a9060373f5d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/beef2634f81f1c086208191f7228bce1d366493d"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: fix potencial OOB in get_file_all_info() for compound requests", "id": "2460536", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460536"}, "csaw": false, "cwe": "CWE-120", "details": ["A flaw was found in the ksmbd module of the Linux kernel. A remote attacker can exploit this vulnerability by sending a specially crafted compound request, specifically a combination of QUERY_DIRECTORY and QUERY_INFO. Due to a missing validation check for the client-provided output buffer length, an out-of-bounds write can occur when processing filenames. This can lead to memory corruption, potentially causing a denial of service or other unpredictable system behavior."], "name": "CVE-2026-31433", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31433\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31433\nhttps://lore.kernel.org/linux-cve-announce/2026042216-CVE-2026-31433-51e6@gregkh/T"]}

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