CVE-2026-31523

Service interruption via NVMe queue polling race

Published Apr 22, 2026 · Updated Apr 22, 2026

A race condition in the Linux Kernel NVMe PCI driver allows local users to interrupt service by racing polled-queue remapping during reset. In nvme_poll() in drivers/nvme/host/pci.c, the driver checks only for pending completions and can poll a queue after it has switched to interrupt-driven mode, allowing both paths to complete the same request. Triggering the race requires local access, a runtime change to the polled-queue count, a concurrent controller reset, and high-priority polling I/O; the reported consequence is double completion and availability loss.

CVSS severity4.7
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in the Linux Kernel NVMe PCI driver allows local users to interrupt service by racing polled-queue remapping during reset. In nvme_poll() in drivers/nvme/host/pci.c, the driver checks only for pending completions and can poll a queue after it has switched to interrupt-driven mode, allowing both paths to complete the same request. Triggering the race requires local access, a runtime change to the polled-queue count, a concurrent controller reset, and high-priority polling I/O; the reported consequence is double completion and availability loss.

The record

CVE
CVE-2026-31523
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-367, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0685dd9cb855ab77fcf3577b4702ba1d6df1c98d
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <166e31d7dbf6aa44829b98aa446bda5c9580f12a
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f12734c4b619f923a4df0b1a46b8098b187d324
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <965e2c943f065122f14282a88d70a8a92e12a4da
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <acbc72dd1a09df53cafcf577259f4678be6afd6d
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b222680ba55e018426c4535067a008f1d81a5d21
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b96c7b25eb1b748f3e3b1832ebf028b0b223d7e3
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ba167d5982e2eb6ff9356d409eca592ce99555da

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0685dd9cb855ab77fcf3577b4702ba1d6df1c98d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <166e31d7dbf6aa44829b98aa446bda5c9580f12a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6f12734c4b619f923a4df0b1a46b8098b187d324; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <965e2c943f065122f14282a88d70a8a92e12a4da; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <acbc72dd1a09df53cafcf577259f4678be6afd6d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b222680ba55e018426c4535067a008f1d81a5d21; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b96c7b25eb1b748f3e3b1832ebf028b0b223d7e3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ba167d5982e2eb6ff9356d409eca592ce99555da

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499Endpoint Denial of Service

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

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Your stack

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