{"id":"CVE-2026-64391","summary":"ksmbd: use opener credentials for ADS I/O","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use opener credentials for ADS I/O\n\nAlternate data streams are stored as xattrs. Unlike regular file I/O,\ntheir read and write paths therefore call VFS xattr helpers which recheck\ninode permissions and LSM policy using the current task credentials.\n\nRun ADS I/O with the credentials captured when the SMB handle was opened.","modified":"2026-08-18T03:30:50.278147588Z","published":"2026-07-25T08:50:38.013Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64391.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64391.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64391"},{"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":"f44158485826c076335d6860d35872271a83791d"},{"fixed":"a8f5d39971bbad9340d49cd41b0e2da9452a649d"},{"fixed":"2b4592cea214683de0f2ce6f8c22c097fb0ea1ab"},{"fixed":"52a56cf53ec834c44ac1b4d16d585f26613ee5ce"},{"fixed":"baa5e094886fffa7e6272edcb5e08be5ce28262c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64391.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"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-2026-64391.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}