CVE-2026-74344

In the Linux kernel, the following vulnerability has been resolved:

bpf: Clear rb node linkage when freeing bpf_rb_root

bpf_rb_root_free() detaches the root by copying the current rb_root_cached

and then replacing the live root with RB_ROOT_CACHED. It then walks the

copied root and drops each object contained in the tree.

This leaves the rb node state intact while dropping the object. If the

object is refcounted and survives the drop, its bpf_rb_node_kern still

contains an owner pointer to the freed root and stale rb tree linkage. If

a later bpf_rb_root allocation reuses the same address, bpf_rbtree_remove()

can incorrectly pass the owner check and call rb_erase_cached() on a node

whose rb pointers belong to the old tree.

Mirror the list draining behavior by marking nodes as busy while the root

is being detached, then clear the rb node and release the owner before

dropping the containing object. This makes surviving nodes unowned and

safe to reject from remove or accept for a later add.