CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's SUNRPC implementation, specifically in the handling of cache details during network namespace teardown. The flaw can lead to a use-after-free condition, where a dangling pointer may be dereferenced, potentially resulting in system instability or exploitation. System administrators and developers managing Linux-based systems should prioritize this issue to mitigate risks associated with memory management vulnerabilities.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: SUNRPC: always drain cache_cleaner before destroying a cache_detail sunrpc_destroy_cache_detail() only cancels the global cache_cleaner delayed_work when cache_list is empty. During per-netns teardown cache_list is never empty because init_net's caches remain registered, so the cancel never fires. After unlink, the caller proceeds to cache_destroy_net() which kfrees the cache_detail while cache_clean() may still hold a dangling pointer to it. The result is a use-after-free: cache_dequeue() takes cd->queue_lock on freed memory, and cache_put() dereferences cd->cache_put as a function pointer from freed slab. Drop the list_empty guard so that cancel_delayed_work_sync() always runs, ensuring any in-flight cache_clean() completes before the cache_detail is freed. Re-arm the cleaner afterwards if other caches are still registered.