CVE-2026-23105

net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag

State: Published
Severity: 7.8 High
Published: Feb 4, 2026
Updated: Oct 19, 2026
Reserved: Jan 13, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-20 Improper Input Validation

Affected Products

Product	Versions
LinuxLinux	462dbc9101acd38e92eda93c0726857517a24bbd to before fac2c67bb2bb732eae4283e45fc338af7e08c254Affected 462dbc9101acd38e92eda93c0726857517a24bbd to before b8c24cf5268fb3bfb8d16324c3dbb985f698c835Affected 462dbc9101acd38e92eda93c0726857517a24bbd to before f27047abf7cac1b6f90c3ad60de21ef9f717c26dAffected 462dbc9101acd38e92eda93c0726857517a24bbd to before 93b8635974fb050c43d07e35e5edfe6e685ca28aAffected 462dbc9101acd38e92eda93c0726857517a24bbd to before abd9fc26ea577561a5ef6241a1b058755ffdad0cAffected 462dbc9101acd38e92eda93c0726857517a24bbd to before 77f1afd0bb4d5da95236f6114e6d0dfcde187ff6Affected 462dbc9101acd38e92eda93c0726857517a24bbd to before d837fbee92453fbb829f950c8e7cf76207d73f33Affected
LinuxLinux	3.8Affected before 3.8Not affected 5.10.249 through 5.10.Not affected 5.15.199 through 5.15.Not affected 6.1.162 through 6.1.Not affected 6.6.122 through 6.6.Not affected 6.12.68 through 6.12.Not affected 6.18.8 through 6.18.Not affected 6.19 and laterNot affected

Product

Versions

LinuxLinux

462dbc9101acd38e92eda93c0726857517a24bbd to before fac2c67bb2bb732eae4283e45fc338af7e08c254Affected
462dbc9101acd38e92eda93c0726857517a24bbd to before b8c24cf5268fb3bfb8d16324c3dbb985f698c835Affected
462dbc9101acd38e92eda93c0726857517a24bbd to before f27047abf7cac1b6f90c3ad60de21ef9f717c26dAffected
462dbc9101acd38e92eda93c0726857517a24bbd to before 93b8635974fb050c43d07e35e5edfe6e685ca28aAffected
462dbc9101acd38e92eda93c0726857517a24bbd to before abd9fc26ea577561a5ef6241a1b058755ffdad0cAffected
462dbc9101acd38e92eda93c0726857517a24bbd to before 77f1afd0bb4d5da95236f6114e6d0dfcde187ff6Affected
462dbc9101acd38e92eda93c0726857517a24bbd to before d837fbee92453fbb829f950c8e7cf76207d73f33Affected

LinuxLinux

3.8Affected
before 3.8Not affected
5.10.249 through 5.10.*Not affected
5.15.199 through 5.15.*Not affected
6.1.162 through 6.1.*Not affected
6.6.122 through 6.6.*Not affected
6.12.68 through 6.12.*Not affected
6.18.8 through 6.18.*Not affected
6.19 and laterNot affected

References

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