CVE-2026-22999

net/sched: sch_qfq: do not free existing class in qfq_change_class()

CVSS 7.8 HIGHEPSS 0.2%

Vexday Risk Score

21Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 7.8EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

25 Jan 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux · Linux

References

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