CVE-2026-31529

Local denial of service via CXL resource leak

Published Apr 22, 2026 · Updated Apr 22, 2026

Resource leak in Linux Kernel allows local users to exhaust kernel memory by repeatedly constructing failing CXL regions. In __construct_region(), the first sysfs_update_group() failure returns before the allocated resource is freed because cxl_region_iomem_release() cannot release it that early. Repeatedly reaching this local CXL region error path can interrupt service; local low-privilege access and a failing initial sysfs group update are required.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in Linux Kernel allows local users to exhaust kernel memory by repeatedly constructing failing CXL regions. In __construct_region(), the first sysfs_update_group() failure returns before the allocated resource is freed because cxl_region_iomem_release() cannot release it that early. Repeatedly reaching this local CXL region error path can interrupt service; local low-privilege access and a failing initial sysfs group update are required.

The record

CVE
CVE-2026-31529
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, 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=6.19
  2. Affected versionversion=d6602e25819dea2c239972e98e09ba5db4aebd22 <77b310bb7b5ff8c017524df83292e0242ba89791
  3. Affected versionversion=d6602e25819dea2c239972e98e09ba5db4aebd22 <f1b4741adf08b0063291ec1b0dfa9c3d55644933

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=d6602e25819dea2c239972e98e09ba5db4aebd22 <77b310bb7b5ff8c017524df83292e0242ba89791; version=d6602e25819dea2c239972e98e09ba5db4aebd22 <f1b4741adf08b0063291ec1b0dfa9c3d55644933

Published CVSS scores

5.5NVDCVSS: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

CWE-401Missing Release of Memory after Effective Lifetime
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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