---
title: "CVE-2026-93817: Linux Kernel - Use After Free"
description: "Linux kernel contains a use-after-free vulnerability caused by improper freeing of event::addr_filter_ranges under RCU, letting attackers cause memory corruption or denial of service, exploit requires kernel-level access."
url: https://panop.io/threat-heartbeat/CVE-2026-93817/
---

# CVE-2026-93817 Linux Kernel - Use After Free

Linux kernel contains a use-after-free vulnerability caused by improper freeing of event::addr\_filter\_ranges under RCU, letting attackers cause memory corruption or denial of service, exploit requires kernel-level access.

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-2026-93817)

## 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

24 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for addr\_filter\_ranges lifetime.

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-2026-93817](https://nvd.nist.gov/vuln/detail/CVE-2026-93817)
- [https://git.kernel.org/stable/c/6f1853b2b9f38f1343790bae8c0601b3f7554754](https://git.kernel.org/stable/c/6f1853b2b9f38f1343790bae8c0601b3f7554754)
- [https://git.kernel.org/stable/c/cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1](https://git.kernel.org/stable/c/cd8dab11046c03ab07899ce3fe2aa7d1a9702cf1)
- [https://git.kernel.org/stable/c/e62d4192e593630f355094adc467058a05bdc935](https://git.kernel.org/stable/c/e62d4192e593630f355094adc467058a05bdc935)

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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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