{"id":"CVE-2026-90162","summary":"ksmbd: defer publishing granted locks to prevent UAF/double-free race","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: defer publishing granted locks to prevent UAF/double-free race\n\nIn smb2_lock(), mid-batch granted locks are published to connection-wide\n(conn-\u003elock_list) and file-wide (fp-\u003elock_list) lists immediately upon\nvfs_lock_file() success, while also remaining tracked on the stack-local\nrollback_list.\n\nIf a subsequent element in the same SMB2_LOCK request array fails\nvalidation or execution, the thread jumps to out: and walks\nrollback_list to undo previously granted locks. However, because the\ngranted lock was already published to conn-\u003elock_list, a concurrent\nUNLOCK request on the same connection can find the lock object and\nkfree() it before the rollback loop executes.\n\nWhen the granting thread subsequently walks rollback_list, it\ndereferences and frees the already-freed ksmbd_lock structure, resulting\nin a Use-After-Free and Double-Free (on both ksmbd_lock and struct\nfile_lock).\n\nFix this by deferring the publication of granted locks to\nconn-\u003elock_list and fp-\u003elock_list until after the entire array of lock\nelements has been processed without error. Mid-batch grants remain\ntracked exclusively on the request-local rollback_list until the whole\nbatch succeeds, eliminating the race window.","modified":"2026-09-18T03:48:36.274761216Z","published":"2026-09-17T16:06:53.136Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90162.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/29f74f0f2e6df3b393b7b66e810136d0c64e3c59"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a1d26dfb32919088e3638dca01068df3c4507433"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90162.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90162"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9"},{"fixed":"a1d26dfb32919088e3638dca01068df3c4507433"},{"fixed":"29f74f0f2e6df3b393b7b66e810136d0c64e3c59"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90162.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.15.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90162.json"}}],"schema_version":"1.9.0"}