---
title: "CVE-2026-89655: Linux Kernel ceph - Use After Free"
description: "Linux kernel ceph contains a use-after-free vulnerability in __kick_flushing_caps() caused by accessing freed cf entries during list iteration, letting attackers cause memory corruption or denial of service, exploit requires race condition timing."
url: https://panop.io/threat-heartbeat/CVE-2026-89655/
---

# CVE-2026-89655 Linux Kernel ceph - Use After Free

Linux kernel ceph contains a use-after-free vulnerability in \_\_kick\_flushing\_caps() caused by accessing freed cf entries during list iteration, letting attackers cause memory corruption or denial of service, exploit requires race condition timing.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.71% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89655)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/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 \_\_kick\_flushing\_caps() use-after-free.

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-2026-89655](https://nvd.nist.gov/vuln/detail/CVE-2026-89655)
- [https://git.kernel.org/stable/c/23eb34a53a53cb1a6dab1eeee830633207ac158d](https://git.kernel.org/stable/c/23eb34a53a53cb1a6dab1eeee830633207ac158d)
- [https://git.kernel.org/stable/c/2701431aa3cc8b23efe6890182e7b04f5e76fab5](https://git.kernel.org/stable/c/2701431aa3cc8b23efe6890182e7b04f5e76fab5)
- [https://git.kernel.org/stable/c/2dba24dcd5050be4b7b119e6f0b01f62203b5d26](https://git.kernel.org/stable/c/2dba24dcd5050be4b7b119e6f0b01f62203b5d26)
- [https://git.kernel.org/stable/c/7af4c4f01305b0935adf6d4301b1ec407025485d](https://git.kernel.org/stable/c/7af4c4f01305b0935adf6d4301b1ec407025485d)
- [https://git.kernel.org/stable/c/fe46746087b5b9c5bb2d022df6c7819218494ced](https://git.kernel.org/stable/c/fe46746087b5b9c5bb2d022df6c7819218494ced)
- [https://git.kernel.org/stable/c/01542430081014d80fc9e70e92d6647432ddb7fc](https://git.kernel.org/stable/c/01542430081014d80fc9e70e92d6647432ddb7fc)
- [https://git.kernel.org/stable/c/091137821e1fc88f37e15201abf055c9494ddc61](https://git.kernel.org/stable/c/091137821e1fc88f37e15201abf055c9494ddc61)
- [https://git.kernel.org/stable/c/19f16f04c2b014a7dd214dc1e42557d8530b16f3](https://git.kernel.org/stable/c/19f16f04c2b014a7dd214dc1e42557d8530b16f3)

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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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