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1.0 KiB
CVE-2025-38177
Description
In the Linux kernel, the following vulnerability has been resolved:sch_hfsc: make hfsc_qlen_notify() idempotenthfsc_qlen_notify() is not idempotent either and not friendlyto its callers, like fq_codel_dequeue(). Let's make it idempotentto ease qdisc_tree_reduce_backlog() callers' life:1. update_vf() decreases cl->cl_nactive, so we can check whether it isnon-zero before calling it.2. eltree_remove() always removes RB node cl->el_node, but we can use RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.
POC
Reference
No PoCs from references.