CVE-2026-64054

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

net: shaper: reject duplicate leaves in GROUP request

net_shaper_nl_group_doit() does not deduplicate NET_SHAPER_A_LEAVES

entries. When userspace supplies the same leaf handle twice, the same

old-parent pointer lands twice in old_nodes[]. The cleanup loop double

frees the parent. Of course the same parent may still be in old_nodes[]

twice if we are moving multiple of its leaves.

Note that this patch also implicitly fixes the fact that the

i >= leaves_count path forgets to set ret.