CVE-2026-22999

high

Description

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.

References

https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd

https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78

https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50

Details

Source: Mitre, NVD

Published: 2026-01-25

Updated: 2026-01-25

Risk Information

CVSS v2

Base Score: 6.1

Vector: CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:C

Severity: Medium

CVSS v3

Base Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Severity: High