High 7.8Published May 2, 2025

CVE-2025-37798codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

Updated under an hour ago (Oct 26, 2026, 5:50 PM ET)

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It affects Linux and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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().

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 15, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	76e3cc126bb223013a6b9a0e2a51238d1ef2e409 builds before 7a742a9506849d1c1aa71e36c89855ceddc7d58e; from 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 before cc71a757da78dd4aa1b4a9b19cb011833730ccf2; from 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 before eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450; from 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 before 829c49b6b2ff45b043739168fd1245e4e1a91a30; 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 builds before 2f9761a94bae33d26e6a81b31b36e7d776d93dc1; 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 builds before 4d55144b12e742404bb3f8fee6038bafbf45619d; from 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 before e73c838c80dccb9e4f19becc11d9f3cb4a27d483; from 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 before a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31; and 1 more ranges	CNA record
linux linux_kernel linux:linux_kernel	from 3.5 before 5.4.297; from 5.5 before 5.10.241; from 5.11 before 5.15.190; from 5.16 before 6.1.135; from 6.2 before 6.6.88; from 6.7 before 6.12.24; from 6.13 before 6.13.12; from 6.14 before 6.14.3; and 1 more ranges	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/7a742a9506849d1c1aa71e36c89855ceddc7d58e	patch
https://git.kernel.org/stable/c/cc71a757da78dd4aa1b4a9b19cb011833730ccf2	patch
https://git.kernel.org/stable/c/eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450	patch
https://git.kernel.org/stable/c/829c49b6b2ff45b043739168fd1245e4e1a91a30	patch
https://git.kernel.org/stable/c/2f9761a94bae33d26e6a81b31b36e7d776d93dc1	patch
https://git.kernel.org/stable/c/4d55144b12e742404bb3f8fee6038bafbf45619d	patch
https://git.kernel.org/stable/c/e73c838c80dccb9e4f19becc11d9f3cb4a27d483	patch
https://git.kernel.org/stable/c/a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31	patch
https://git.kernel.org/stable/c/342debc12183b51773b3345ba267e9263bdfaaef	patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html	issue-tracking, third-party-advisory
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.