High 7.8Published Feb 4, 2026

CVE-2026-23105net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag

Updated under an hour ago (Oct 27, 2026, 11:23 PM ET)

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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: net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag This is more of a preventive patch to make the code more consistent and to prevent possible exploits that employ child qlen manipulations on qfq. use cl_is_active instead of relying on the child qdisc's qlen to determine class activation.

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): CWE-20
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 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 462dbc9101acd38e92eda93c0726857517a24bbd before fac2c67bb2bb732eae4283e45fc338af7e08c254; from 462dbc9101acd38e92eda93c0726857517a24bbd before b8c24cf5268fb3bfb8d16324c3dbb985f698c835; from 462dbc9101acd38e92eda93c0726857517a24bbd before f27047abf7cac1b6f90c3ad60de21ef9f717c26d; 462dbc9101acd38e92eda93c0726857517a24bbd builds before 93b8635974fb050c43d07e35e5edfe6e685ca28a; from 462dbc9101acd38e92eda93c0726857517a24bbd before abd9fc26ea577561a5ef6241a1b058755ffdad0c; 462dbc9101acd38e92eda93c0726857517a24bbd builds before 77f1afd0bb4d5da95236f6114e6d0dfcde187ff6; from 462dbc9101acd38e92eda93c0726857517a24bbd before d837fbee92453fbb829f950c8e7cf76207d73f33	CNA record
linux linux_kernel linux:linux_kernel	from 3.8 before 5.10.249; from 5.11 before 5.15.199; from 5.16 before 6.1.162; from 6.2 before 6.6.122; from 6.7 before 6.12.68; from 6.13 before 6.18.8; 6.19; 6.19; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/fac2c67bb2bb732eae4283e45fc338af7e08c254	patch
https://git.kernel.org/stable/c/b8c24cf5268fb3bfb8d16324c3dbb985f698c835	patch
https://git.kernel.org/stable/c/f27047abf7cac1b6f90c3ad60de21ef9f717c26d	patch
https://git.kernel.org/stable/c/93b8635974fb050c43d07e35e5edfe6e685ca28a	patch
https://git.kernel.org/stable/c/abd9fc26ea577561a5ef6241a1b058755ffdad0c	patch
https://git.kernel.org/stable/c/77f1afd0bb4d5da95236f6114e6d0dfcde187ff6	patch
https://git.kernel.org/stable/c/d837fbee92453fbb829f950c8e7cf76207d73f33	patch

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.