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CVE-2025-38177

7.8 · HIGH

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…

Published Jul 4, 2025CWE-459EPSS 0.20%

Overview

CVE-2025-38177 is a high-severity vulnerability. It was published on July 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0475c85426b18eccdcb7f9fb58d8f8e9c6c58c87Refgit.kernel.org/stable/c/51eb3b65544c9efd6a1026889ee5fb5aa62da3bbRefgit.kernel.org/stable/c/72c61ffbeeb8c50f6d4d70c65d3283aa1bac57a7Refgit.kernel.org/stable/c/9030a91235ae4845ec71902c3e0cecfc9ed1f2dfRefgit.kernel.org/stable/c/9a5fd5c2f4d4afdd5e405083ee53e0789ce76956Refgit.kernel.org/stable/c/a5efc95a33bd4fcb879250852828cc58c7862970Refgit.kernel.org/stable/c/c1175c4ad01dbc9c979d099861fa90a754f72059Refgit.kernel.org/stable/c/d06476714d2819b550e0cc39222347e2c8941c9dReflists.debian.org/debian-lts-announce/2025/08/msg00010.htmlReflists.debian.org/debian-lts-announce/2025/10/msg00007.html

How CyberStrike helps

Frequently asked questions

What is CVE-2025-38177?

CVE-2025-38177 is a high-severity vulnerability. It was published on July 4, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2025-38177?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-38177?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-38177?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-38177 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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