Linux Kernel nilfs2 Vulnerability in Sysfs Interface Management

CVE-2023-53440

What is CVE-2023-53440?

The nilfs2 component of the Linux kernel suffers from a vulnerability related to the management of its sysfs interface. This issue arises due to the improper timing in the creation and deletion of sysfs entries connected to metadata files such as 'cpfile', 'sufile', or 'dat'. Specifically, the creation routine is called before the corresponding metadata file inodes are loaded, while the deletion process occurs after these inodes have been released. This can result in access attempts to sysfs attributes that are outside the valid lifetime of the associated metadata, possibly leading to null pointer dereference and use-after-free scenarios. Additionally, composition relationships during semaphore locking can induce false lock dependencies, triggering misleading warnings. This has been addressed by refining the timing of sysfs interface management to ensure it aligns correctly with the metadata file's lifecycle.

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