---
title: "CVE-2026-98017: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability in net/sched caused by improper qdisc freeing after failed creation in clsact during RTM_NEWQDISC requests, letting attackers cause denial of service, exploit requires crafted netlink messages."
url: https://panop.io/threat-heartbeat/CVE-2026-98017/
---

# CVE-2026-98017 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability in net/sched caused by improper qdisc freeing after failed creation in clsact during RTM\_NEWQDISC requests, letting attackers cause denial of service, exploit requires crafted netlink messages.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.13% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-98017)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

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

Published

25 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for qdisc freeing after failed creation.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-98017](https://nvd.nist.gov/vuln/detail/CVE-2026-98017)
- [https://git.kernel.org/stable/c/156a3bab69744e9225bb9eff8c5cc53da18d5a2e](https://git.kernel.org/stable/c/156a3bab69744e9225bb9eff8c5cc53da18d5a2e)
- [https://git.kernel.org/stable/c/20bf6fa34b345333971bd4464a322cce87b83f4e](https://git.kernel.org/stable/c/20bf6fa34b345333971bd4464a322cce87b83f4e)
- [https://git.kernel.org/stable/c/5bfe927c5b4b290fad529186218c728589b4b101](https://git.kernel.org/stable/c/5bfe927c5b4b290fad529186218c728589b4b101)
- [https://git.kernel.org/stable/c/e6662f2100f8d33b0f4d0047c219efd6bba186ea](https://git.kernel.org/stable/c/e6662f2100f8d33b0f4d0047c219efd6bba186ea)
- [https://git.kernel.org/stable/c/6a1b49bb9fdf9e8e7aa38e8cd635c0cc4074447d](https://git.kernel.org/stable/c/6a1b49bb9fdf9e8e7aa38e8cd635c0cc4074447d)
- [https://git.kernel.org/stable/c/96a27a3e64e7c87abade03fb2ad04ed66992a89a](https://git.kernel.org/stable/c/96a27a3e64e7c87abade03fb2ad04ed66992a89a)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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