{"cve":"CVE-2025-38177","nvd":{"published":"2025-07-04T13:15:24.033","modified":"2026-07-30T06:22:57.540","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsch_hfsc: make hfsc_qlen_notify() idempotent\n\nhfsc_qlen_notify() is not idempotent either and not friendly\nto its callers, like fq_codel_dequeue(). Let's make it idempotent\nto ease qdisc_tree_reduce_backlog() callers' life:\n\n1. update_vf() decreases cl->cl_nactive, so we can check whether it is\nnon-zero before calling it.\n\n2. eltree_remove() always removes RB node cl->el_node, but we can use\n   RB_EMPTY_NODE() + RB_CLEAR_NODE() to make it safe.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-459"],"references":["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"],"products":["debian:debian_linux","linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:04:28.436527499+00:00"},"epss":{"cve":"CVE-2025-38177","score":0.00211,"percentile":0.11446,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}