CVE-2025-38468

CVE-2025-38468 in the Linux kernel affects the net/sched path where htb_lookup_leaf may trigger BUG_ON when handling an empty red-black tree during HTB dequeue. The described stack shows a sequence ending with a BUG_ON in htb_lookup_leaf, which is resolved by returning NULL from htb_lookup_leaf (...

CVE-2025-38468 net/sched: Return NULL when htb_lookup_leaf encounters an empty rbtree

In the Linux kernel, the following vulnerability has been resolved: net/sched: Return NULL when htblookupleaf encounters an empty rbtree htblookupleaf has a BUGON that can trigger with the following: tc qdisc del dev lo root tc qdisc add dev lo root handle 1: htb default 1 tc class add dev lo...