Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ksmbd: vfs: fix race on m_flags in vfs_cache ksmbd maintains delete-on-close and pending-delete state in ksmbd_inode->m_flags. In vfs_cache.c this field is accessed under inconsistent locking: some paths read and modify m_flags under ci->m_lock while others do so without taking the lock at all. Examples: - ksmbd_query_inode_status() and __ksmbd_inode_close() use ci->m_lock when checking or updating m_flags. - ksmbd_inode_pending_delete(), ksmbd_set_inode_pending_delete(), ksmbd_clear_inode_pending_delete() and ksmbd_fd_set_delete_on_close() used to read and modify m_flags without ci->m_lock. This creates a potential data race on m_flags when multiple threads open, close and delete the same file concurrently. In the worst case delete-on-close and pending-delete bits can be lost or observed in an inconsistent state, leading to confusing delete semantics (files that stay on disk after delete-on-close, or files that disappear while still in use). Fix it by: - Making ksmbd_query_inode_status() look at m_flags under ci->m_lock after dropping inode_hash_lock. - Adding ci->m_lock protection to all helpers that read or modify m_flags (ksmbd_inode_pending_delete(), ksmbd_set_inode_pending_delete(), ksmbd_clear_inode_pending_delete(), ksmbd_fd_set_delete_on_close()). - Keeping the existing ci->m_lock protection in __ksmbd_inode_close(), and moving the actual unlink/xattr removal outside the lock. This unifies the locking around m_flags and removes the data race while preserving the existing delete-on-close behaviour.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f44158485826c076335d6860d35872271a83791d before 5adad9727a815c26013b0d41cfee92ffa7d4037c; affected f44158485826c076335d6860d35872271a83791d before ccc78781041589ea383e61d5d7a1e9a31b210b93; affected f44158485826c076335d6860d35872271a83791d before ee63729760f5b61a66f345c54dc4c7514e62383d; affected f44158485826c076335d6860d35872271a83791d before 991f8a79db99b14c48d20d2052c82d65b9186cad |
| Linux / Linux | affected 5.15; unaffected 0 before 5.15; unaffected 6.6.120 through 6.6.*; unaffected 6.12.64 through 6.12.*; unaffected 6.18.3 through 6.18.*; unaffected 6.19 through * |
CWE
No CWE identifiers supplied.