CVE-2026-31432

{"id": "CVE-2026-31432", "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": "9f297df20d93411c0b4ddad7f88ba04a7cd36e77", "lessThan": "533f84264e28c54a79257ea87d2f94a0fcc9a611", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "850452af77f55d185f9445e1f7a1db53c5e4aad4", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "075ea208c648cc2bcd616295b711d3637c61de45", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "515c2daab46021221bdf406bef19bc90a44ec617", "versionType": "git"}, {"status": "affected", "version": "e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d", "lessThan": "fda9522ed6afaec45cabc198d8492270c394c7bc", "versionType": "git"}, {"status": "affected", "version": "f2283680a80571ca82d710bc6ecd8f8beac67d63", "versionType": "git"}, {"status": "affected", "version": "6.1.71", "lessThan": "6.1.191", "versionType": "semver"}, {"status": "affected", "version": "5.15.145", "lessThan": "5.16", "versionType": "semver"}], "programFiles": ["fs/smb/server/smb2pdu.c", "fs/smb/server/smbacl.c", "fs/smb/server/smbacl.h"], "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": "6.1.191", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.143", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.81", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.22", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "6.19.12", "versionType": "semver", "lessThanOrEqual": "6.19.*"}, {"status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/smb2pdu.c", "fs/smb/server/smbacl.c", "fs/smb/server/smbacl.h"], "defaultStatus": "affected"}]}], "published": "2026-04-22T09:16:21.410", "references": [{"url": "https://git.kernel.org/stable/c/075ea208c648cc2bcd616295b711d3637c61de45", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/515c2daab46021221bdf406bef19bc90a44ec617", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/533f84264e28c54a79257ea87d2f94a0fcc9a611", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/850452af77f55d185f9445e1f7a1db53c5e4aad4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d48c64fb80ad78b3dd29fb7d79b6ec7bd72bfc09", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/fda9522ed6afaec45cabc198d8492270c394c7bc", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix OOB write in QUERY_INFO for compound requests\n\nWhen a compound request such as READ + QUERY_INFO(Security) is received,\nand the first command (READ) consumes most of the response buffer,\nksmbd could write beyond the allocated buffer while building a security\ndescriptor.\n\nThe root cause was that smb2_get_info_sec() checked buffer space using\nppntsd_size from xattr, while build_sec_desc() often synthesized a\nsignificantly larger descriptor from POSIX ACLs.\n\nThis patch introduces smb_acl_sec_desc_scratch_len() to accurately\ncompute the final descriptor size beforehand, performs proper buffer\nchecking with smb2_calc_max_out_buf_len(), and uses exact-sized\nallocation + iov pinning."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nksmbd: correcci\u00f3n de escritura fuera de l\u00edmites en QUERY_INFO para solicitudes compuestas\n\nCuando se recibe una solicitud compuesta como READ + QUERY_INFO(Security), y el primer comando (READ) consume la mayor parte del b\u00fafer de respuesta, ksmbd podr\u00eda escribir m\u00e1s all\u00e1 del b\u00fafer asignado mientras construye un descriptor de seguridad.\n\nLa causa ra\u00edz fue que smb2_get_info_sec() verificaba el espacio del b\u00fafer usando ppntsd_size de xattr, mientras que build_sec_desc() a menudo sintetizaba un descriptor significativamente m\u00e1s grande a partir de ACL de POSIX.\n\nEste parche introduce smb_acl_sec_desc_scratch_len() para calcular con precisi\u00f3n el tama\u00f1o final del descriptor de antemano, realiza una verificaci\u00f3n adecuada del b\u00fafer con smb2_calc_max_out_buf_len(), y utiliza asignaci\u00f3n de tama\u00f1o exacto + fijaci\u00f3n de iov."}], "lastModified": "2026-11-11T23:10:00.263", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B98C9201-BF17-4E2C-84FF-75EE2AA94DC5", "versionEndExcluding": "5.16", "versionStartIncluding": "5.15.145"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "163E72B5-0F5D-49E2-AAEA-F11E02D730AD", "versionEndExcluding": "6.2", "versionStartIncluding": "6.1.71"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D467CA25-2A1E-475C-969E-62759720CE35", "versionEndExcluding": "6.12.81", "versionStartIncluding": "6.6"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "C9DF8BCE-36D3-475D-9D21-19E4F02F9029", "versionEndExcluding": "6.18.22", "versionStartIncluding": "6.13"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0A2B9540-02D5-41B4-B16A-82AF66FD4F36", "versionEndExcluding": "6.19.12", "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"}, 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