High 7.8Published Jan 25, 2026

CVE-2026-22999net/sched: sch_qfq: do not free existing class in qfq_change_class()

Updated under an hour ago (Oct 28, 2026, 3:50 AM 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: sch_qfq: do not free existing class in qfq_change_class() Fixes qfq_change_class() error case. cl->qdisc and cl should only be freed if a new class and qdisc were allocated, or we risk various UAF.

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-416
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)	462dbc9101acd38e92eda93c0726857517a24bbd builds before 2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e; from 462dbc9101acd38e92eda93c0726857517a24bbd before cff6cd703f41d8071995956142729e4bba160363; from 462dbc9101acd38e92eda93c0726857517a24bbd before f06f7635499bc806cbe2bbc8805c7cef8b1edddf; 462dbc9101acd38e92eda93c0726857517a24bbd builds before 0a234660dc70ce45d771cbc76b20d925b73ec160; 462dbc9101acd38e92eda93c0726857517a24bbd builds before 362e269bb03f7076ba9990e518aeddb898232e50; from 462dbc9101acd38e92eda93c0726857517a24bbd before e9d8f11652fa08c647bf7bba7dd8163241a332cd; from 462dbc9101acd38e92eda93c0726857517a24bbd before 3879cffd9d07aa0377c4b8835c4f64b4fb24ac78	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 6.12.67; from 6.13 before 6.18.7; 6.19; 6.19; and 3 more ranges	NVD

References

References

https://git.kernel.org/stable/c/2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e	patch
https://git.kernel.org/stable/c/cff6cd703f41d8071995956142729e4bba160363	patch
https://git.kernel.org/stable/c/f06f7635499bc806cbe2bbc8805c7cef8b1edddf	patch
https://git.kernel.org/stable/c/0a234660dc70ce45d771cbc76b20d925b73ec160	patch
https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50	patch
https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd	patch
https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78	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.