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

INFO

Published Date :

Jan. 25, 2026, 3:15 p.m.

Last Modified :

Feb. 6, 2026, 5:16 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2026-22999 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Address use-after-free vulnerabilities by ensuring proper memory management.
  • Apply the kernel patch for sch_qfq.
  • Ensure qfq_change_class() handles allocation errors correctly.
  • Verify memory management logic in class handling.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-22999.

URL Resource
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
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-22999 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-22999 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-22999 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-22999 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 06, 2026

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/2a64fb9b47afffeb5dbab5fd3a518e1436dcc90e
    Added Reference https://git.kernel.org/stable/c/cff6cd703f41d8071995956142729e4bba160363
    Added Reference https://git.kernel.org/stable/c/f06f7635499bc806cbe2bbc8805c7cef8b1edddf
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jan. 30, 2026

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/0a234660dc70ce45d771cbc76b20d925b73ec160
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jan. 25, 2026

    Action Type Old Value New Value
    Added 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.
    Added Reference https://git.kernel.org/stable/c/362e269bb03f7076ba9990e518aeddb898232e50
    Added Reference https://git.kernel.org/stable/c/3879cffd9d07aa0377c4b8835c4f64b4fb24ac78
    Added Reference https://git.kernel.org/stable/c/e9d8f11652fa08c647bf7bba7dd8163241a332cd
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.