---
title: "CVE-2026-90042: Linux kernel Ceph - Denial of Service"
description: "Linux kernel contains a memory handling vulnerability in Ceph where vmalloc() buffers are improperly decrypted in fscrypt subsystem, causing kernel oops on non-x86 platforms, exploit requires crafted Ceph messages in vmalloc buffers."
url: https://panop.io/threat-heartbeat/CVE-2026-90042/
---

# CVE-2026-90042 Linux kernel Ceph - Denial of Service

Linux kernel contains a memory handling vulnerability in Ceph where vmalloc() buffers are improperly decrypted in fscrypt subsystem, causing kernel oops on non-x86 platforms, exploit requires crafted Ceph messages in vmalloc buffers.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.50% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90042)

## 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:H/I:H/A:H

Published

16 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for proper decryption of vmalloc buffers in Ceph.

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-2026-90042](https://nvd.nist.gov/vuln/detail/CVE-2026-90042)
- [https://git.kernel.org/stable/c/110747ff535e3d98ac17d68dbd056bb6ef000e23](https://git.kernel.org/stable/c/110747ff535e3d98ac17d68dbd056bb6ef000e23)
- [https://git.kernel.org/stable/c/3b467c68803d7c7e82678289e598afd44faa6101](https://git.kernel.org/stable/c/3b467c68803d7c7e82678289e598afd44faa6101)
- [https://git.kernel.org/stable/c/e939fc6a7bd969a58a150b7f188c1047138403e3](https://git.kernel.org/stable/c/e939fc6a7bd969a58a150b7f188c1047138403e3)
- [https://git.kernel.org/stable/c/93729594af506557a86f8b603be7ac5f3370eeca](https://git.kernel.org/stable/c/93729594af506557a86f8b603be7ac5f3370eeca)

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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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