CVE-2025-38177 Information

Jul 05, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

sch_hfsc: make hfsc_qlen_notify() idempotent

hfsc_qlen_notify() is not idempotent either and not friendly to its callers like fq_codel_dequeue(). Let’s make it idempotent to ease qdisc_tree_reduce_backlog() callers’ life:

  1. update_vf() decreases cl->cl_nactive so we can check whether it is non-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.

Reference

https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87 https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059 https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d

CNNVD-202507-445 (Published: 2025-07-04)

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