CVE-2026-22999

MEDIUM

Linux kernel - Use After Free

Title source: llm

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 (7)

[Patch] https://git.kernel.org/stable/c/0a234660dc70ce45d771cbc76b20d925b73ec160

[Patch] https://git.kernel.org/stable/c/2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e

[Patch] https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50

[Patch] https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78

[Patch] https://git.kernel.org/stable/c/cff6cd703f41d8071995956142729e4bba160363

[Patch] https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd

[Patch] https://git.kernel.org/stable/c/f06f7635499bc806cbe2bbc8805c7cef8b1edddf

Scores

CVSS v3 5.5

EPSS 0.0001

EPSS Percentile 0.9%

Attack Vector LOCAL

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

Classification

Status published

Affected Products (12)

linux/Kernel < 5.10.249linux

linux/Kernel < 5.15.199linux

linux/Kernel < 6.1.162linux

linux/Kernel < 6.6.122linux

linux/Kernel < 6.12.67linux

linux/Kernel < 6.18.7linux

linux/linux_kernel < 5.10.249

linux/linux_kernel

linux/linux_kernel

linux/linux_kernel

linux/linux_kernel

linux/linux_kernel

Timeline

Published Jan 25, 2026

Tracked Since Feb 18, 2026