---
title: "CVE-2026-89647: Linux Kernel - Denial of Service"
description: "Linux kernel contains a denial of service caused by a busy loop in ceph_trim_dentries() due to repeated re-queuing when no progress is possible, letting attackers cause high CPU usage, exploit requires no special privileges."
url: https://panop.io/threat-heartbeat/CVE-2026-89647/
---

# CVE-2026-89647 Linux Kernel - Denial of Service

Linux kernel contains a denial of service caused by a busy loop in ceph\_trim\_dentries() due to repeated re-queuing when no progress is possible, letting attackers cause high CPU usage, exploit requires no special privileges.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.62% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89647)

## Details

Type

Denial of Service

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 ceph\_trim\_dentries() busy loop issue.

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-2026-89647](https://nvd.nist.gov/vuln/detail/CVE-2026-89647)
- [https://git.kernel.org/stable/c/37d6edb2f03b29399a3a337fae78674de51e1695](https://git.kernel.org/stable/c/37d6edb2f03b29399a3a337fae78674de51e1695)
- [https://git.kernel.org/stable/c/3d122b2feb1dd76bb5041bdea5e1e1b007d8d415](https://git.kernel.org/stable/c/3d122b2feb1dd76bb5041bdea5e1e1b007d8d415)
- [https://git.kernel.org/stable/c/5a541eb401acb89d791da41189d7a79220164b93](https://git.kernel.org/stable/c/5a541eb401acb89d791da41189d7a79220164b93)
- [https://git.kernel.org/stable/c/e7d7aa7b730178278109c41fa1b17b06873065d5](https://git.kernel.org/stable/c/e7d7aa7b730178278109c41fa1b17b06873065d5)

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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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