CVE-2025-38177

sch_hfsc: make hfsc_qlen_notify() idempotent

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.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

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

Frequently Asked Questions

What is the severity of CVE-2025-38177?: CVE-2025-38177 has not yet been assigned a CVSS score.
How to fix CVE-2025-38177?: To fix CVE-2025-38177, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-38177 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-38177 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-38177?: CVE-2025-38177 affects Linux Linux, Linux Linux.

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