CVE WatchJul 30, 2026

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

CVSS

7.8

High

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: Jul 4, 2025 · Last modified: Jul 30, 2026 · CWE-459

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-042026-07-31

Technical 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.

Official references

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