CVE-2025-38177
Analyzed Analyzed - Analysis Complete
BaseFortify

Publication date: 2025-07-04

Last updated on: 2025-12-18

Assigner: kernel.org

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.
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Meta Information
Published
2025-07-04
Last Modified
2025-12-18
Generated
2026-05-07
AI Q&A
2025-07-04
EPSS Evaluated
2026-05-05
NVD
CVE-2025-38177
Affected Vendors & Products
Showing 9 associated CPEs
Vendor Product Version / Range
linux linux_kernel to 5.4.297 (exc)
linux linux_kernel From 5.5 (inc) to 5.10.241 (exc)
linux linux_kernel From 5.11 (inc) to 5.15.190 (exc)
linux linux_kernel From 5.16 (inc) to 6.1.138 (exc)
linux linux_kernel From 6.2 (inc) to 6.6.90 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.28 (exc)
linux linux_kernel From 6.13 (inc) to 6.14.6 (exc)
linux linux_kernel 6.15
debian debian_linux 11.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-459 The product does not properly "clean up" and remove temporary or supporting resources after they have been used.
CWE-NVD-CWE-noinfo
Attack-Flow Graph
AI Powered Q&A
How can this vulnerability impact me? :

Because hfsc_qlen_notify() was not idempotent, repeated or improper calls could lead to inconsistent kernel behavior or errors in network traffic scheduling. This could potentially affect system stability or network performance on Linux systems using the HFSC queuing discipline.


Can you explain this vulnerability to me?

This vulnerability involves the Linux kernel's sch_hfsc component, specifically the hfsc_qlen_notify() function. The function was not idempotent, meaning repeated calls could cause unintended side effects or errors. The fix makes hfsc_qlen_notify() idempotent to ensure it behaves safely when called multiple times, improving stability and reliability in related kernel functions like fq_codel_dequeue() and qdisc_tree_reduce_backlog().


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