Bug 2363671 (CVE-2025-37798)

Summary: CVE-2025-37798 kernel: codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()
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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OS: Linux   
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Description OSIDB Bzimport 2025-05-02 15:01:20 UTC 
In the Linux kernel, the following vulnerability has been resolved:

codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

After making all ->qlen_notify() callbacks idempotent, now it is safe to
remove the check of qlen!=0 from both fq_codel_dequeue() and
codel_qdisc_dequeue().
Comment 1 Avinash Hanwate 2025-05-05 06:22:59 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025050212-CVE-2025-37798-1d06@gregkh/T