CVE-2026-68312— Linux kernel 安全漏洞

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

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.

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Linux kernel 安全漏洞

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.15版本存在安全漏洞，该漏洞源于在cifs延迟关闭清理路径中，内存分配失败时未正确处理cifsFileInfo，导致资源泄漏。

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