HighFix available
codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()
Type: advisorySources: OSV
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().
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.241, 5.15.190, 5.4.297, 6.1.135, 6.12.24, 6.13.12, 6.14.3, 6.6.88
- CVEs
- CVE-2025-37798
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 20:32 UTC · Revision 1
Source evidence
codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()
core-osv · Original sourcePublished 2 May 2025, 14:16 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().
osv:CVE-2025-37798
Kernel
Fixed versions: 5.4.297, 5.10.241, 5.15.190, 6.1.135, 6.6.88, 6.12.24, 6.13.12, 6.14.3
Complete source record
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"id": "f99ec7662fb9d2592616da9047320f765371e0f09d1a032f4313d92e8b1b6261",
"url": "https://osv.dev/vulnerability/CVE-2025-37798",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()",
"summary": "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().",
"evidence": "osv:CVE-2025-37798",
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"modified": "2026-10-28T02:30:23.629117161Z",
"provider": "osv",
"references": [
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"https://git.kernel.org/stable/c/342debc12183b51773b3345ba267e9263bdfaaef",
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"https://git.kernel.org/stable/c/cc71a757da78dd4aa1b4a9b19cb011833730ccf2",
"https://git.kernel.org/stable/c/e73c838c80dccb9e4f19becc11d9f3cb4a27d483",
"https://git.kernel.org/stable/c/eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450",
"https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html",
"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37798.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-37798",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"provider_metadata": {
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
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"source_id": "core-osv",
"document_id": 489894,
"published_at": "2025-05-02T14:16:02.623+00:00"
}