{"api_version":"1","generated_at":"2026-05-30T17:59:41+00:00","cve":"CVE-2026-46195","urls":{"html":"https://cve.report/CVE-2026-46195","api":"https://cve.report/api/cve/CVE-2026-46195.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46195","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46195"},"summary":{"title":"smb: client: validate dacloffset before building DACL pointers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: validate dacloffset before building DACL pointers\n\nparse_sec_desc(), build_sec_desc(), and the chown path in\nid_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd\nbefore proving a DACL header fits inside the returned security\ndescriptor.\n\nOn 32-bit builds a malicious server can return dacloffset near\nU32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip\npast the later pointer-based bounds checks. build_sec_desc() and\nid_mode_to_cifs_acl() can then dereference DACL fields from the wrapped\npointer in the chmod/chown rewrite paths.\n\nValidate dacloffset numerically before building any DACL pointer and\nreuse the same helper at the three DACL entry points.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-28 10:16:35","updated_at":"2026-05-30 11:17:25"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a","name":"https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a","name":"https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7","name":"https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3","name":"https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505","name":"https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46195","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46195","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 ba7f71b6161c0943dafc367565e5843d16b7d505 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 3b1ddba19e77ee35241cd27f16dc3e8d14e08db7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 c688f3ed73d31943334ad2139cb02ec49664322a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected bc3e9dd9d104ca1b75644eab87b38ce8a924aef4 8bd07e417b6bda67e317920584e48cb6ee442a8a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: validate dacloffset before building DACL pointers\n\nparse_sec_desc(), build_sec_desc(), and the chown path in\nid_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd\nbefore proving a DACL header fits inside the returned security\ndescriptor.\n\nOn 32-bit builds a malicious server can return dacloffset near\nU32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip\npast the later pointer-based bounds checks. build_sec_desc() and\nid_mode_to_cifs_acl() can then dereference DACL fields from the wrapped\npointer in the chmod/chown rewrite paths.\n\nValidate dacloffset numerically before building any DACL pointer and\nreuse the same helper at the three DACL entry points."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"providerMetadata":{"dateUpdated":"2026-05-30T10:48:55.662Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505"},{"url":"https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7"},{"url":"https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a"},{"url":"https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a"},{"url":"https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3"}],"title":"smb: client: validate dacloffset before building DACL pointers","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46195","datePublished":"2026-05-28T09:36:48.259Z","dateReserved":"2026-05-13T15:03:33.104Z","dateUpdated":"2026-05-30T10:48:55.662Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-28 10:16:35","lastModifiedDate":"2026-05-30 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in\nid_mode_to_cifs_acl() all add the server-supplied dacloffset to pntsd\nbefore proving a DACL header fits inside the returned security\ndescriptor.\n\nOn 32-bit builds a malicious server can return dacloffset near\nU32_MAX, wrap the derived DACL pointer below end_of_acl, and then slip\npast the later pointer-based bounds checks. build_sec_desc() and\nid_mode_to_cifs_acl() can then dereference DACL fields from the wrapped\npointer in the chmod/chown rewrite paths.\n\nValidate dacloffset numerically before building any DACL pointer and\nreuse the same helper at the three DACL entry points.","Type":"Description","Title":"smb: client: validate dacloffset before building DACL pointers"}]}}}