Bug 2367511 (CVE-2025-37932)

Summary: CVE-2025-37932 kernel: sch_htb: make htb_qlen_notify() idempotent
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-05-20 16:01:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

sch_htb: make htb_qlen_notify() idempotent

htb_qlen_notify() always deactivates the HTB class and in fact could
trigger a warning if it is already deactivated. Therefore, it is not
idempotent and not friendly to its callers, like fq_codel_dequeue().

Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers'
life.
Comment 1 Jon Moroney 2025-05-20 19:36:28 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025052006-CVE-2025-37932-0842@gregkh/T