---
title: "CVE-2026-90324: Linux Kernel - Denial of Service"
description: "Linux kernel contains a denial of service caused by improper handling of import_ubuf() failure in ublk, letting attackers cause system instability, exploit requires user space ublk server to provide out-of-range address."
url: https://panop.io/threat-heartbeat/CVE-2026-90324/
---

# CVE-2026-90324 Linux Kernel - Denial of Service

Linux kernel contains a denial of service caused by improper handling of import\_ubuf() failure in ublk, letting attackers cause system instability, exploit requires user space ublk server to provide out-of-range address.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90324)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for import\_ubuf() handling.

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-2026-90324](https://nvd.nist.gov/vuln/detail/CVE-2026-90324)
- [https://git.kernel.org/stable/c/0121c84adb6a4cd6f7560b5895bd88f9899bbc1f](https://git.kernel.org/stable/c/0121c84adb6a4cd6f7560b5895bd88f9899bbc1f)
- [https://git.kernel.org/stable/c/3831568792af75b6523fa93bb91560e29189cf55](https://git.kernel.org/stable/c/3831568792af75b6523fa93bb91560e29189cf55)
- [https://git.kernel.org/stable/c/5ac6019cb78e98c9608fda72726b36ddf8474dd7](https://git.kernel.org/stable/c/5ac6019cb78e98c9608fda72726b36ddf8474dd7)

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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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