---
title: "CVE-2026-81010: Linux Kernel io_uring - Denial of Service"
description: "Linux kernel io_uring contains a task_work cancellation handling flaw in io_waitid_cb(), causing incorrect child process wait behavior when fallback task_work runs from kworker, letting attackers cause denial of service by request cancellation."
url: https://panop.io/threat-heartbeat/CVE-2026-81010/
---

# CVE-2026-81010 Linux Kernel io\_uring - Denial of Service

Linux kernel io\_uring contains a task\_work cancellation handling flaw in io\_waitid\_cb(), causing incorrect child process wait behavior when fallback task\_work runs from kworker, letting attackers cause denial of service by request cancellation.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-81010)

## Details

Type

Denial of Service

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

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for io\_uring task\_work cancellation handling.

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-2026-81010](https://nvd.nist.gov/vuln/detail/CVE-2026-81010)
- [https://git.kernel.org/stable/c/14572de82e5022899e5856008bc9cac97004a88c](https://git.kernel.org/stable/c/14572de82e5022899e5856008bc9cac97004a88c)
- [https://git.kernel.org/stable/c/7bc98e2de8c58a2bfaf0f540eb096a386ecfc96c](https://git.kernel.org/stable/c/7bc98e2de8c58a2bfaf0f540eb096a386ecfc96c)
- [https://git.kernel.org/stable/c/0879697520abda2383ed7be40572ad583b5c4b02](https://git.kernel.org/stable/c/0879697520abda2383ed7be40572ad583b5c4b02)

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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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