CVE-2026-68312

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths

In cifs_close_deferred_file(), cifs_close_all_deferred_files(), and

cifs_close_deferred_file_under_dentry(), when a pending deferred close

is cancelled via cancel_delayed_work(), the subsequent kmalloc_obj() to

add the file to the local processing list may fail under memory pressure.

The loop breaks immediately, but the cancelled work is no longer pending

(it would have called _cifsFileInfo_put()), and the cfile is never added

to file_head for processing. The cifsFileInfo reference and the open

server handle both leak.

Fix by saving the cfile that failed allocation in a local variable,

breaking as before, and calling _cifsFileInfo_put() on it after

releasing the lock. Any files later in the iteration are unaffected

since their deferred work is still pending and will fire normally.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References