CVE-2026-74273

Kernel disruption via concurrent CXL region deletion

Published Aug 15, 2026 · Updated Aug 15, 2026

Race condition in the Linux kernel CXL region subsystem allows local users to disrupt region creation through concurrent deletion. The region lock does not cover the intervals from construct_region() to attach_target() or from device_add() to remove-action registration, allowing deletion while code assumes a live cxl_region. High local privileges and a configured CXL region are required; published sources do not identify whether the resulting interruption is a hang, crash, or another failure.

CVSS severity4.7
Medium
EPSS probability0.15%
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

Race condition in the Linux kernel CXL region subsystem allows local users to disrupt region creation through concurrent deletion. The region lock does not cover the intervals from construct_region() to attach_target() or from device_add() to remove-action registration, allowing deletion while code assumes a live cxl_region. High local privileges and a configured CXL region are required; published sources do not identify whether the resulting interruption is a hang, crash, or another failure.

The record

CVE
CVE-2026-74273
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=6.3
  2. Affected versionversion=a32320b71f085f8d82afedcf285f1682c8c00aed <b0b6a9c65cb72c901fdcc6ae83d7afd70cdca1b8
  3. Affected versionversion=a32320b71f085f8d82afedcf285f1682c8c00aed <d91feb88692e81b00cd22f0125cfcd04970b4a0b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.3; version=a32320b71f085f8d82afedcf285f1682c8c00aed <b0b6a9c65cb72c901fdcc6ae83d7afd70cdca1b8; version=a32320b71f085f8d82afedcf285f1682c8c00aed <d91feb88692e81b00cd22f0125cfcd04970b4a0b

Published CVSS scores

4.7Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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

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