{"id":"CVE-2026-64395","summary":"ksmbd: require source read access for duplicate extents","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: require source read access for duplicate extents\n\nFSCTL_DUPLICATE_EXTENTS_TO_FILE passes the source file directly to\nvfs_clone_file_range() or vfs_copy_file_range() without checking the SMB\naccess mask granted to the source handle. A handle opened with attribute\naccess can consequently be used to copy file contents into an\nattacker-readable destination.\n\nRequire FILE_READ_DATA on the source handle before either VFS operation,\nmatching other ksmbd data-copy paths.","modified":"2026-07-28T04:02:54.349871575Z","published":"2026-07-25T08:50:40.393Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64395.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2d2ab6983620c2d60ce7db72133984ca3873b929"},{"type":"WEB","url":"https://git.kernel.org/stable/c/67bdad9cf01b25030e3bf00bbce6c309319d6663"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a10942af27832c2761d020863a46e79bebe0567d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cedff600f1642aa982178503552f0d007bc829c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db231af842868268839f9f9619c68cb27830d8be"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64395.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64395"},{"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":"eb817368f50c1cbe1bd07044124aad7db6330e3a"},{"fixed":"2d2ab6983620c2d60ce7db72133984ca3873b929"},{"fixed":"67bdad9cf01b25030e3bf00bbce6c309319d6663"},{"fixed":"b0d4d5cb846a1ddb7aaab9adfb5986e4540e6e5f"},{"fixed":"db231af842868268839f9f9619c68cb27830d8be"},{"fixed":"a10942af27832c2761d020863a46e79bebe0567d"},{"fixed":"cedff600f1642aa982178503552f0d007bc829c8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64395.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"6.1.178"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.145"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64395.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:N/A:N"}]}