---
title: "CVE-2026-99081: Linux kernel bnxt_en - Denial of Service"
description: "Linux kernel bnxt_en driver contains a DMA buffer overrun caused by incorrect DMA mapping length for padded small packets, letting attackers trigger Intel IOMMU DMA read faults on BCM57412 NetXtreme-E NICs, exploit requires sending small packets near 4KB page boundaries."
url: https://panop.io/threat-heartbeat/CVE-2026-99081/
---

# CVE-2026-99081 Linux kernel bnxt\_en - Denial of Service

Linux kernel bnxt\_en driver contains a DMA buffer overrun caused by incorrect DMA mapping length for padded small packets, letting attackers trigger Intel IOMMU DMA read faults on BCM57412 NetXtreme-E NICs, exploit requires sending small packets near 4KB page boundaries.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.21% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-99081)

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

Published

23 October 2026

Updated

25 October 2026

## Vendor fix

Update to the Linux kernel version containing the fix for bnxt\_en DMA mapping length for padded small packets.

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-2026-99081](https://nvd.nist.gov/vuln/detail/CVE-2026-99081)
- [https://git.kernel.org/stable/c/2956aca14dd2977cd08bd2ccafae3beb8b84b268](https://git.kernel.org/stable/c/2956aca14dd2977cd08bd2ccafae3beb8b84b268)
- [https://git.kernel.org/stable/c/5213f65a9667d3dd85db2e6df8f2e0516290db34](https://git.kernel.org/stable/c/5213f65a9667d3dd85db2e6df8f2e0516290db34)
- [https://git.kernel.org/stable/c/a51d233ccd4889aadb71dace863525cc2b00271e](https://git.kernel.org/stable/c/a51d233ccd4889aadb71dace863525cc2b00271e)
- [https://git.kernel.org/stable/c/cf8530a25ae92c4493e2f22981ecb46f0b66f4c8](https://git.kernel.org/stable/c/cf8530a25ae92c4493e2f22981ecb46f0b66f4c8)
- [https://git.kernel.org/stable/c/fbd977e513971ccb4f0762a7f59eac500e474f89](https://git.kernel.org/stable/c/fbd977e513971ccb4f0762a7f59eac500e474f89)

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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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