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Linux CVE-2026-22999

HIGH
2026-01-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Information Disclosure Linux
7.8
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

6
Re-analysis Queued
Apr 27, 2026 - 14:22 vuln.today
cvss_changed
Severity Changed
Apr 27, 2026 - 14:22 NVD
MEDIUM HIGH
CVSS changed
Apr 27, 2026 - 14:22 NVD
5.5 (MEDIUM) 7.8 (HIGH)
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

DescriptionCVE.org

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.

AnalysisAI

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. A patch is available to resolve this issue.

Technical ContextAI

Affects Linux Kernel. 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.

RemediationAI

A vendor patch is available — apply it immediately.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.35 Container suse/sl-micro/6.0/toolbox:13.2-9.1 Image SLE-Micro-Azure Image SLE-Micro-BYOS Image SLE-Micro-BYOS-Azure Image SLE-Micro-BYOS-EC2 Image SLE-Micro-BYOS-GCE Image SLE-Micro-GCE Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.95 Image SL-Micro Image SLE-Micro Image SLE-Micro-EC2 Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.115 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.146 Affected
Container suse/sl-micro/6.1/base-os-container:2.2.1-5.80 Image SL-Micro-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected

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CVE-2026-22999 vulnerability details – vuln.today
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