---
title: "CVE-2026-89652: Linux kernel Ceph - Buffer Overflow"
description: "Linux kernel Ceph contains a buffer overflow caused by unchecked dname_len in ceph_get_name and __get_snap_name functions, letting malicious or compromised Ceph MDS cause out-of-bounds write, exploit requires CephFS mount re-exported over NFS."
url: https://panop.io/threat-heartbeat/CVE-2026-89652/
---

# CVE-2026-89652 Linux kernel Ceph - Buffer Overflow

Linux kernel Ceph contains a buffer overflow caused by unchecked dname\_len in ceph\_get\_name and \_\_get\_snap\_name functions, letting malicious or compromised Ceph MDS cause out-of-bounds write, exploit requires CephFS mount re-exported over NFS.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

EPSS

0.46% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89652)

## Details

Type

Buffer Overflow

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 a Linux kernel version that includes ceph\_export\_copy\_name() with length checks or latest available version.

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-2026-89652](https://nvd.nist.gov/vuln/detail/CVE-2026-89652)
- [https://git.kernel.org/stable/c/a294064e0e0f81ea607b2f019e16888aa1b0a011](https://git.kernel.org/stable/c/a294064e0e0f81ea607b2f019e16888aa1b0a011)
- [https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec](https://git.kernel.org/stable/c/06fb5e623cdc2402d6bb29be94d9beb9a826ffec)
- [https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a](https://git.kernel.org/stable/c/61d9f27b191b838b96b697ce0bfaee39a138243a)
- [https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6](https://git.kernel.org/stable/c/e7c2fd3893a7f7fcd7e8cf0b2c6348bb1e893df6)
- [https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae](https://git.kernel.org/stable/c/eff8013c5a8916613c742ae5a2cc341cb605c0ae)

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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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