CVE-2025-38177

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.

The following products are affected by CVE-2025-38177 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-38177.

URL	Resource
https://git.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87
https://git.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bb
https://git.kernel.org/stable/c/72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7
https://git.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2df
https://git.kernel.org/stable/c/9a5fd5c2f4d4afdd5e405083ee53e0789ce76956
https://git.kernel.org/stable/c/a5efc95a33bd4fcb879250852828cc58c7862970
https://git.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059
https://git.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9d
https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html
https://lore.kernel.org/linux-cve-announce/2025070411-CVE-2025-38177-bd6c@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2025-38177
https://www.cve.org/CVERecord?id=CVE-2025-38177