CVE-2026-31708

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The QUERY_INFO branch clamps\nqi.input_buffer_length to the server-reported OutputBufferLength and then\ncopies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but\nit never verifies that the flexible-array payload actually fits within\nrsp_iov[1].iov_len.\n\nA malicious server can return OutputBufferLength larger than the actual\nQUERY_INFO response, causing copy_to_user() to walk past the response\nbuffer and expose adjacent kernel heap to userspace.\n\nGuard the QUERY_INFO copy with a bounds check on the actual Buffer\npayload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length)\nrather than an open-coded addition so the guard cannot overflow on\n32-bit builds."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The attacker-controlled data is an SMB2 QUERY_INFO response sent by a remote SMB server to the kernel SMB client over the network. The vulnerable copy is reached after the client issues the ioctl-triggered compound open/query/close request.\nAC:L - There is no race or fragile timing requirement; a malicious server controls the malformed response fields and can reliably make the advertised copy length exceed the actual response payload. CIFS/SMB client support is common and the affected SMB2+ path is not a rare configuration.\nPR:N - The malicious SMB server needs no privileges on the vulnerable client. The affected PASSTHRU_QUERY_INFO branch has no CAP_SYS_ADMIN check, unlike the FSCTL and SET_INFO branches.\nUI:R - A victim or local process must have mounted/accessed the SMB share and issued the CIFS_QUERY_INFO ioctl. The malicious server cannot reach this ioctl path entirely unsolicited.\nS:U - The impact is within the vulnerable kernel/client system security scope. This is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The bug is an out-of-bounds kernel read copied to userspace from beyond the received SMB response buffer. The overread can expose adjacent kernel heap data and is not strictly bounded to only a few harmless bytes.\nI:N - The vulnerable operation is a read from kernel memory followed by copy_to_user. It does not provide a kernel write primitive or direct data modification.\nA:H - The same attacker-controlled length can drive copy_to_user far beyond the valid response buffer. That can trigger kernel faults or hardened usercopy failures, so a kernel crash is a defensible impact."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/smb2ops.c"], "versions": [{"version": "f5778c398713692a16150ae96e5c8270bab8399f", "lessThan": "e66bdc0704977ecee667a81d38255b579c2353d0", "status": "affected", "versionType": "git"}, {"version": "f5778c398713692a16150ae96e5c8270bab8399f", "lessThan": "9e203dbb5402897c43130fb171a2617008a91f45", "status": "affected", "versionType": "git"}, {"version": "f5778c398713692a16150ae96e5c8270bab8399f", "lessThan": "1dd757379997b71a328a4b591ffaf481acd0ead1", "status": "affected", "versionType": "git"}, {"version": "f5778c398713692a16150ae96e5c8270bab8399f", "lessThan": "a34d456934fe42e4da5d2cc07787bf418bee99c6", "status": "affected", "versionType": "git"}, {"version": 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The vulnerable copy is reached after the client issues the ioctl-triggered compound open/query/close request.\nAC:L - There is no race or fragile timing requirement; a malicious server controls the malformed response fields and can reliably make the advertised copy length exceed the actual response payload. CIFS/SMB client support is common and the affected SMB2+ path is not a rare configuration.\nPR:N - The malicious SMB server needs no privileges on the vulnerable client. The affected PASSTHRU_QUERY_INFO branch has no CAP_SYS_ADMIN check, unlike the FSCTL and SET_INFO branches.\nUI:R - A victim or local process must have mounted/accessed the SMB share and issued the CIFS_QUERY_INFO ioctl. The malicious server cannot reach this ioctl path entirely unsolicited.\nS:U - The impact is within the vulnerable kernel/client system security scope. This is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The bug is an out-of-bounds kernel read copied to userspace from beyond the received SMB response buffer. The overread can expose adjacent kernel heap data and is not strictly bounded to only a few harmless bytes.\nI:N - The vulnerable operation is a read from kernel memory followed by copy_to_user. It does not provide a kernel write primitive or direct data modification.\nA:H - The same attacker-controlled length can drive copy_to_user far beyond the valid response buffer. 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The QUERY_INFO branch clamps\nqi.input_buffer_length to the server-reported OutputBufferLength and then\ncopies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but\nit never verifies that the flexible-array payload actually fits within\nrsp_iov[1].iov_len.\n\nA malicious server can return OutputBufferLength larger than the actual\nQUERY_INFO response, causing copy_to_user() to walk past the response\nbuffer and expose adjacent kernel heap to userspace.\n\nGuard the QUERY_INFO copy with a bounds check on the actual Buffer\npayload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length)\nrather than an open-coded addition so the guard cannot overflow on\n32-bit builds."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.259", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.210", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.175", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.136", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.84", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.25", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.2", "versionStartIncluding": "5.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "5.1"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:24:43.143Z"}}}, "cveMetadata": {"cveId": "CVE-2026-31708", "state": "PUBLISHED", "dateUpdated": "2026-10-19T19:06:06.825Z", "dateReserved": "2026-03-09T15:48:24.132Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-05-01T13:56:05.880Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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The QUERY_INFO branch clamps\nqi.input_buffer_length to the server-reported OutputBufferLength and then\ncopies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but\nit never verifies that the flexible-array payload actually fits within\nrsp_iov[1].iov_len.\n\nA malicious server can return OutputBufferLength larger than the actual\nQUERY_INFO response, causing copy_to_user() to walk past the response\nbuffer and expose adjacent kernel heap to userspace.\n\nGuard the QUERY_INFO copy with a bounds check on the actual Buffer\npayload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length)\nrather than an open-coded addition so the guard cannot overflow on\n32-bit builds."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsmb: cliente: corregir lectura fuera de l\u00edmites en la ruta QUERY_INFO de smb2_ioctl_query_info\n\nsmb2_ioctl_query_info() tiene dos ramas de copia de respuesta: PASSTHRU_FSCTL y la ruta QUERY_INFO predeterminada. La rama QUERY_INFO limita qi.input_buffer_length a la OutputBufferLength reportada por el servidor y luego copia qi.input_buffer_length bytes de qi_rsp -> Buffer al espacio de usuario, pero nunca verifica que la carga \u00fatil del array flexible realmente quepa dentro de rsp_iov[1].iov_len.\n\nUn servidor malicioso puede devolver una OutputBufferLength mayor que la respuesta QUERY_INFO real, haciendo que copy_to_user() se desplace m\u00e1s all\u00e1 del b\u00fafer de respuesta y exponga el heap adyacente del kernel al espacio de usuario.\n\nProteger la copia QUERY_INFO con una comprobaci\u00f3n de l\u00edmites en la carga \u00fatil real del Buffer. Usar struct_size(qi_rsp, Buffer, qi.input_buffer_length) en lugar de una adici\u00f3n codificada abiertamente para que la protecci\u00f3n no pueda desbordarse en compilaciones de 32 bits."}], "id": "CVE-2026-31708", "lastModified": "2026-11-11T21:10:00.200", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31708", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:12:45.456025Z", "version": "2.0.3"}}]}, "published": "2026-05-01T14:16:20.837", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/078fae8f50adebb903ccf2252b44391324571e78"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1dd757379997b71a328a4b591ffaf481acd0ead1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/85fd46ee26a11841c670449508025965f61ce131"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e203dbb5402897c43130fb171a2617008a91f45"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a34d456934fe42e4da5d2cc07787bf418bee99c6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ac2f14e4705d020f04e806efa0d49ab8dc2b145f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e66bdc0704977ecee667a81d38255b579c2353d0"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-125"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path", "id": "2464396", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464396"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-805", "details": ["A flaw was found in the Linux kernel's Server Message Block (SMB) client. A malicious server can exploit an out-of-bounds read vulnerability by manipulating the OutputBufferLength during a QUERY_INFO operation. This can lead to the exposure of sensitive kernel memory to userspace, resulting in information disclosure."], "name": "CVE-2026-31708", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31708\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31708\nhttps://lore.kernel.org/linux-cve-announce/2026050121-CVE-2026-31708-f27c@gregkh/T"], "threat_severity": "Moderate"}

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