CVE-2026-45855

Local service interruption via non-NCQ command starvation

Published May 27, 2026 · Updated May 27, 2026

Command starvation in affected Linux Kernel releases allows local users to interrupt non-NCQ storage operations through ATA commands. The ata_scsi_qc_issue() path repeatedly returns SCSI_MLQUEUE_XXX_BUSY for a non-NCQ command while other submission queues keep issuing NCQ commands, so the deferred operation makes no forward progress. Exploitation requires local low-privileged access, a multi-queue host adapter, and sustained NCQ traffic; the consequence is prolonged delay or complete starvation of non-NCQ disk operations.

CVSS severity5.8
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Command starvation in affected Linux Kernel releases allows local users to interrupt non-NCQ storage operations through ATA commands. The ata_scsi_qc_issue() path repeatedly returns SCSI_MLQUEUE_XXX_BUSY for a non-NCQ command while other submission queues keep issuing NCQ commands, so the deferred operation makes no forward progress. Exploitation requires local low-privileged access, a multi-queue host adapter, and sustained NCQ traffic; the consequence is prolonged delay or complete starvation of non-NCQ disk operations.

The record

CVE
CVE-2026-45855
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.10
  2. Affected versionversion=bdb01301f3ea51a59eff252b06643fc1fe843e57 <0ea84089dbf62a92dc7889c79e6b18fc89260808
  3. Affected versionversion=bdb01301f3ea51a59eff252b06643fc1fe843e57 <5d61a38a60e62750526d94663b69b7ac5c7f07a5
  4. Affected versionversion=bdb01301f3ea51a59eff252b06643fc1fe843e57 <888cd7e40adb2ef4af1b4d3b6e2e83ad409ae8c2
  5. Affected versionversion=bdb01301f3ea51a59eff252b06643fc1fe843e57 <ce22aaed011206fed9cbd8c9c2d44718607f31ee

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.10; version=bdb01301f3ea51a59eff252b06643fc1fe843e57 <0ea84089dbf62a92dc7889c79e6b18fc89260808; version=bdb01301f3ea51a59eff252b06643fc1fe843e57 <5d61a38a60e62750526d94663b69b7ac5c7f07a5; version=bdb01301f3ea51a59eff252b06643fc1fe843e57 <888cd7e40adb2ef4af1b4d3b6e2e83ad409ae8c2; version=bdb01301f3ea51a59eff252b06643fc1fe843e57 <ce22aaed011206fed9cbd8c9c2d44718607f31ee

Published CVSS scores

5.8UbuntuCVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo