---
title: "CVE-2026-93830: Linux Kernel - Denial of Service"
description: "Linux kernel net: stmmac xgmac2 contains an interrupt storm vulnerability caused by enabling RX Buffer Unavailable (RBUE) interrupt in default RX interrupt mask, letting attackers trigger MAC interrupt storms under heavy RX pressure, exploit requires heavy RX traffic conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-93830/
---

# CVE-2026-93830 Linux Kernel - Denial of Service

Linux kernel net: stmmac xgmac2 contains an interrupt storm vulnerability caused by enabling RX Buffer Unavailable (RBUE) interrupt in default RX interrupt mask, letting attackers trigger MAC interrupt storms under heavy RX pressure, exploit requires heavy RX traffic conditions.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.49% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-93830)

## 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

24 September 2026

Updated

15 October 2026

## Vendor fix

Update to the Linux kernel version that disables RBUE in the default RX interrupt mask for xgmac2 devices.

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-2026-93830](https://nvd.nist.gov/vuln/detail/CVE-2026-93830)
- [https://git.kernel.org/stable/c/d3265c19b35d036bba327b36b5366bee76b0157c](https://git.kernel.org/stable/c/d3265c19b35d036bba327b36b5366bee76b0157c)
- [https://git.kernel.org/stable/c/6b3b91433d5f4eae6865cdaa96f40cd67849e1f6](https://git.kernel.org/stable/c/6b3b91433d5f4eae6865cdaa96f40cd67849e1f6)
- [https://git.kernel.org/stable/c/74dbb85a6a254b5fc1f265a6cd61b2ba9d9221d7](https://git.kernel.org/stable/c/74dbb85a6a254b5fc1f265a6cd61b2ba9d9221d7)
- [https://git.kernel.org/stable/c/7a10e54e42a8f73a8d731f5a281fc06bb41b9250](https://git.kernel.org/stable/c/7a10e54e42a8f73a8d731f5a281fc06bb41b9250)
- [https://git.kernel.org/stable/c/8c9d57b5dc098b84631d0b3559c84c499ea2170a](https://git.kernel.org/stable/c/8c9d57b5dc098b84631d0b3559c84c499ea2170a)
- [https://git.kernel.org/stable/c/0b1a5d3647ce07c27a9fffefc11a8cbf7d7b25ce](https://git.kernel.org/stable/c/0b1a5d3647ce07c27a9fffefc11a8cbf7d7b25ce)
- [https://git.kernel.org/stable/c/87e2826ed2058747ddf014c082569a46bfadd96b](https://git.kernel.org/stable/c/87e2826ed2058747ddf014c082569a46bfadd96b)

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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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