CVE-2026-46091

Kernel service interruption via incoherent DMA buffer

Published May 27, 2026 · Updated May 27, 2026

Improper DMA buffer handling in the igorplugusb driver in Linux Kernel allows local users to interrupt kernel service via a USB control request. The driver embeds the USB control-request structure inside its device state instead of allocating a separately coherent DMA buffer for host controllers. Reachability requires the igorplugusb driver, a compatible USB device, and a host controller that DMAs the setup packet; the reported impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper DMA buffer handling in the igorplugusb driver in Linux Kernel allows local users to interrupt kernel service via a USB control request. The driver embeds the USB control-request structure inside its device state instead of allocating a separately coherent DMA buffer for host controllers. Reachability requires the igorplugusb driver, a compatible USB device, and a host controller that DMAs the setup packet; the reported impact is limited to availability.

The record

CVE
CVE-2026-46091
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.19
  2. Affected versionversion=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <0adac0ee2c42027d80bac02ea9b576a88f8955d3
  3. Affected versionversion=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <0be8fcd9005e3d3b5a61fe34b070a9663adbb4dc
  4. Affected versionversion=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <18d6a7c9e4e63c57157e9a57dd9bf3cd38e4c45a
  5. Affected versionversion=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <a62ca67e3c72fb297dc7c86495ba8f7329d7f150
  6. Affected versionversion=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <eac69475b01fe1e861dfe3960b57fa95671c132e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.19; version=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <0adac0ee2c42027d80bac02ea9b576a88f8955d3; version=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <0be8fcd9005e3d3b5a61fe34b070a9663adbb4dc; version=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <18d6a7c9e4e63c57157e9a57dd9bf3cd38e4c45a; version=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <a62ca67e3c72fb297dc7c86495ba8f7329d7f150; version=b1c97193c6437a6083da67f8e97c8ee29b2f1989 <eac69475b01fe1e861dfe3960b57fa95671c132e

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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