The Linux kernel contained a vulnerability where the function shrinker_debugfs_count_show() held an RCU read lock while invoking the ->count_objects() callback. This callback, specifically the zswap implementation, could sleep by flushing memcg stats, which is not allowed inside an RCU read-side critical section. This misuse could lead to kernel bugs such as 'BUG: sleeping function called from invalid context'. The fix removes the rcu_read_lock()/rcu_read_unlock() calls since the memcg iterator internally manages RCU and reference counting, making the external RCU lock unnecessary.

The vulnerability could cause kernel bugs or crashes due to sleeping in an invalid context within the RCU read-side critical section. This may affect system stability but no direct exploit or privilege escalation is indicated in the provided data.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. The vulnerability description indicates it has been resolved, implying a fix is available. Users should apply the official Linux kernel updates that address this issue once released.