{"id":"CVE-2026-46195","summary":"smb: client: validate dacloffset before building DACL pointers","details":"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.","modified":"2026-06-23T03:55:12.798781174Z","published":"2026-05-28T09:36:48.259Z","related":["openSUSE-SU-2026:10954-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46195.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3b1ddba19e77ee35241cd27f16dc3e8d14e08db7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5de2665e913a10ad70aaeecf736b97276e83d995"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8bd07e417b6bda67e317920584e48cb6ee442a8a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ba7f71b6161c0943dafc367565e5843d16b7d505"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c688f3ed73d31943334ad2139cb02ec49664322a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f98b48151cc502ada59d9778f0112d21f2586ca3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f9dc3be8f403c1216df73e57221f44b045e7ee0b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46195.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46195"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bc3e9dd9d104ca1b75644eab87b38ce8a924aef4"},{"fixed":"5de2665e913a10ad70aaeecf736b97276e83d995"},{"fixed":"f9dc3be8f403c1216df73e57221f44b045e7ee0b"},{"fixed":"ba7f71b6161c0943dafc367565e5843d16b7d505"},{"fixed":"3b1ddba19e77ee35241cd27f16dc3e8d14e08db7"},{"fixed":"c688f3ed73d31943334ad2139cb02ec49664322a"},{"fixed":"8bd07e417b6bda67e317920584e48cb6ee442a8a"},{"fixed":"f98b48151cc502ada59d9778f0112d21f2586ca3"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46195.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.12.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.140"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.88"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.30"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-46195.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}