CVE-2024-56549

Summary

CVE-2024-56549 is a vulnerability affecting the Linux kernel where a NULL pointer dereference issue has been identified in the 'cachefiles' module. Specifically, the 'object->file' can be left as a NULL pointer during on-demand mode, leading to a inconsistency between the file descriptor (fd) and the object's file lifetime. This results in a NULL pointer dereference when the user-space invokes anon_fd using object->file. To address this issue, an additional reference count has been added to the object->file before write/llseek operations and decremented afterwards.

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