CVE-2026-22999

MEDIUM
2026-01-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
5.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:59 vuln.today
Patch Released
Feb 26, 2026 - 17:02 nvd
Patch available
CVE Published
Jan 25, 2026 - 15:15 nvd
MEDIUM 5.5

Tags

Linux Linux Kernel Redhat Suse

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.

Analysis

The Linux kernel's QFQ packet scheduler contains a use-after-free vulnerability in the qfq_change_class() function that incorrectly frees class and qdisc objects during error conditions, potentially causing a crash or memory corruption. A local attacker with unprivileged access can trigger this vulnerability to achieve a denial of service. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

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Priority Score

28
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +28
POC: 0

Vendor Status

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CVE-2026-22999 vulnerability details – vuln.today
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