ZDI-26-571: Linux Kernel Net Scheduler Packet Classifier API Use-After-Free Local Privilege Escalation Vulnerability
ZDI disclosed a use-after-free local privilege escalation flaw (CVE-2026-64530) in the Linux Kernel net scheduler packet classifier API.
The Zero Day Initiative published ZDI-26-571 describing a use-after-free in the Linux Kernel net scheduler packet classifier API. Local attackers who can already execute low-privileged code can escalate privileges. ZDI assigned a CVSS score of 8.8 and the identifier CVE-2026-64530.
- Use-after-free in net scheduler classifier enables local privesc
- Requires prior low-privileged code execution; CVSS 8.8
- CVEs
- CVE-2026-64530
- Products
- Linux Kernel
- Organizations
- Zero Day Initiative
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2026-64530 | Linux kernel: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle tcf_classify() can return TC_ACT_CONSUMED… | 9.8 | <1% |
From the original article
This vulnerability allows local attackers to escalate privileges on affected installations of Linux Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.
zerodayinitiative.com
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