---
title: "CVE-2026-89692: Linux Kernel - Broken Access Control"
description: "Linux kernel contains a broken access control vulnerability caused by improper clearing of CALLBACK_RUNNING flag in nfsd delegation recall queue, letting attackers cause delegation recall to stall, exploit requires triggering delegation recall failure."
url: https://panop.io/threat-heartbeat/CVE-2026-89692/
---

# CVE-2026-89692 Linux Kernel - Broken Access Control

Linux kernel contains a broken access control vulnerability caused by improper clearing of CALLBACK\_RUNNING flag in nfsd delegation recall queue, letting attackers cause delegation recall to stall, exploit requires triggering delegation recall failure.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.61% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89692)

## Details

Type

Broken Access Control

Impact

Denial Of Service

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for clearing CALLBACK\_RUNNING flag on failed delegation recall queue.

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-2026-89692](https://nvd.nist.gov/vuln/detail/CVE-2026-89692)
- [https://git.kernel.org/stable/c/b036727d334b1b7cd4c1f1fba3b59ba93a6bbe96](https://git.kernel.org/stable/c/b036727d334b1b7cd4c1f1fba3b59ba93a6bbe96)
- [https://git.kernel.org/stable/c/b137930ee52e3ef38915a3511d4c070463b63a32](https://git.kernel.org/stable/c/b137930ee52e3ef38915a3511d4c070463b63a32)
- [https://git.kernel.org/stable/c/cb2d0c4d1b3d301d042ed61365eaa8cb0141a254](https://git.kernel.org/stable/c/cb2d0c4d1b3d301d042ed61365eaa8cb0141a254)

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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

Panop answers these inside your environment, for this CVE and every other finding.

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