{"id":"CVE-2026-90156","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: safely discard unregistered deferred locks\n\nWhen vfs_lock_file() defers a lock, smb2_lock() puts its ksmbd_lock on\nrollback_list before allocating and registerin…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: safely discard unregistered deferred locks\n\nWhen vfs_lock_file() defers a lock, smb2_lock() puts its ksmbd_lock on\nrollback_list before allocating and registerin…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < d09af9a35ff7b77a950b507133d9092aadbfeff4","Linux >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 054bcca4cd9f00719b01f7108b51a2168fb94f15","Linux 5.15"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:44.593","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90156","references":[{"url":"https://git.kernel.org/stable/c/054bcca4cd9f00719b01f7108b51a2168fb94f15","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d09af9a35ff7b77a950b507133d9092aadbfeff4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00189,"epssPercentile":0.08848,"ingestedAt":"2026-09-17T16:21:47.873Z","slug":"CVE-2026-90156","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: safely discard unregistered deferred locks\n\nWhen vfs_lock_file() defers a lock, smb2_lock() puts its ksmbd_lock on\nrollback_list before allocating and registering the asynchronous work.\nIf either operation fails, rollback assumes that smb_lock->conn is\ninitialized and dereferences NULL. The deferred file_lock also remains\nlinked into the VFS blocked-lock state while it is freed.\n\nKeep the lock off rollback_list until async setup succeeds. On setup\nfailures, explicitly unblock and wake the deferred lock before freeing it\nand its ksmbd wrapper.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}