---
title: "CVE-2026-90240: Linux Kernel - Use After Free"
description: "Linux kernel contains an IOMMU context cache invalidation flaw caused by incorrect source ID usage during DMA alias teardown, letting attackers cause use-after-free in IOMMU memory, exploit requires device DMA aliasing."
url: https://panop.io/threat-heartbeat/CVE-2026-90240/
---

# CVE-2026-90240 Linux Kernel - Use After Free

Linux kernel contains an IOMMU context cache invalidation flaw caused by incorrect source ID usage during DMA alias teardown, letting attackers cause use-after-free in IOMMU memory, exploit requires device DMA aliasing.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.17% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90240)

## Details

Type

Use After Free

Impact

Use After Free, Privilege Escalation

CVSS vector

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

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix applied.

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-2026-90240](https://nvd.nist.gov/vuln/detail/CVE-2026-90240)
- [https://git.kernel.org/stable/c/5baddf100b3be730912485648cbaae5e3a251923](https://git.kernel.org/stable/c/5baddf100b3be730912485648cbaae5e3a251923)
- [https://git.kernel.org/stable/c/a803141597d61dc0511f7cd849625e17d042ca8a](https://git.kernel.org/stable/c/a803141597d61dc0511f7cd849625e17d042ca8a)
- [https://git.kernel.org/stable/c/c54e4ae971b98e8d650400137d332cee56c03f55](https://git.kernel.org/stable/c/c54e4ae971b98e8d650400137d332cee56c03f55)

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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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