CVE-2026-22999
net/sched: sch_qfq: do not free existing class in qfq_change_class()
CVSS Score
7.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jan 25, 2026 |
| Last Updated | Apr 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
Linux / Linux
462dbc9101acd38e92eda93c0726857517a24bbd < 2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e 462dbc9101acd38e92eda93c0726857517a24bbd < cff6cd703f41d8071995956142729e4bba160363 462dbc9101acd38e92eda93c0726857517a24bbd < f06f7635499bc806cbe2bbc8805c7cef8b1edddf 462dbc9101acd38e92eda93c0726857517a24bbd < 0a234660dc70ce45d771cbc76b20d925b73ec160 462dbc9101acd38e92eda93c0726857517a24bbd < 362e269bb03f7076ba9990e518aeddb898232e50 462dbc9101acd38e92eda93c0726857517a24bbd < e9d8f11652fa08c647bf7bba7dd8163241a332cd 462dbc9101acd38e92eda93c0726857517a24bbd < 3879cffd9d07aa0377c4b8835c4f64b4fb24ac78
Linux / Linux
3.8
References
git.kernel.org: https://git.kernel.org/stable/c/2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e git.kernel.org: https://git.kernel.org/stable/c/cff6cd703f41d8071995956142729e4bba160363 git.kernel.org: https://git.kernel.org/stable/c/f06f7635499bc806cbe2bbc8805c7cef8b1edddf git.kernel.org: https://git.kernel.org/stable/c/0a234660dc70ce45d771cbc76b20d925b73ec160 git.kernel.org: https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50 git.kernel.org: https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd git.kernel.org: https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78