{"id":"CVE-2026-64397","summary":"ksmbd: serialize QUERY_DIRECTORY requests per file","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: serialize QUERY_DIRECTORY requests per file\n\nsmb2_query_dir() stores a pointer to its stack-allocated private data in\nthe ksmbd_file readdir_data. Concurrent QUERY_DIRECTORY requests using the\nsame file handle can overwrite this pointer while an iterate_dir() callback\nis still using it, resulting in a stack use-after-free.\n\nAdd a per-file mutex and hold it while accessing the shared directory\nenumeration state. The lock covers scan restart, dot entry state,\nreaddir_data setup and iteration, and response construction. This prevents\nanother request from replacing readdir_data.private before the current\nrequest has finished using it and also serializes the shared file position.","modified":"2026-08-12T03:30:35.316052870Z","published":"2026-07-25T08:50:41.620Z","related":["openSUSE-SU-2026:11476-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64397.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1426fd79102539bc0ab5c8fced047ad4313b9908"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2a64dbf9c739ddf7a25a066507597bf89f8f73d2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/64dac2d486ec1eb18dc00968b16a230b6b75ec24"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199"},{"type":"WEB","url":"https://git.kernel.org/stable/c/be6d26bf27499977c746abc163659915082348d8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fd22b039a5a05bc1d6818e9dcd1001fb432a829d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64397.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64397"},{"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":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9"},{"fixed":"1426fd79102539bc0ab5c8fced047ad4313b9908"},{"fixed":"2a64dbf9c739ddf7a25a066507597bf89f8f73d2"},{"fixed":"64dac2d486ec1eb18dc00968b16a230b6b75ec24"},{"fixed":"a1d5d31cad593ea5e1b637f2f39c9ef6d09d1199"},{"fixed":"fd22b039a5a05bc1d6818e9dcd1001fb432a829d"},{"fixed":"be6d26bf27499977c746abc163659915082348d8"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64397.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/osv-test-cve-osv-conversion/osv-output/CVE-2026-64397.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"}]}