CVE-2026-31530

Kernel memory corruption via freed parent port

Published Apr 22, 2026 · Updated Apr 22, 2026

Use-after-free in the CXL port teardown path in Linux Kernel allows local users with administrative capabilities to corrupt kernel memory. During bottom-up endpoint removal, cxl_detach_ep() can unlock parent_port after concurrent detach or cascading unregister work has freed it because child ports do not retain parent references. Triggering the flaw requires CAP_SYS_ADMIN or CAP_SYS_MODULE and CXL devices; production kernels can suffer silent memory corruption.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the CXL port teardown path in Linux Kernel allows local users with administrative capabilities to corrupt kernel memory. During bottom-up endpoint removal, cxl_detach_ep() can unlock parent_port after concurrent detach or cascading unregister work has freed it because child ports do not retain parent references. Triggering the flaw requires CAP_SYS_ADMIN or CAP_SYS_MODULE and CXL devices; production kernels can suffer silent memory corruption.

The record

CVE
CVE-2026-31530
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
Attack vector
local
Privileges
admin

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=2345df54249c6fb7779e2a72b427ee79ed3eaad5 <19d2f0b97a131198efc2c4ca3eb7f980bba8c2b4
  2. Affected versionversion=2345df54249c6fb7779e2a72b427ee79ed3eaad5 <2c32141462045cf93d54a5146a0ba572b83533dd
  3. Affected versionversion=2345df54249c6fb7779e2a72b427ee79ed3eaad5 <d216a4bd138eb57cc4ae7c43b2f709e3482af7e2
  4. Affected versionversion=2345df54249c6fb7779e2a72b427ee79ed3eaad5 <f7dc6f381a1e5f068333f1faa9265d6af1df4235
  5. Affected versionversion=6.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2345df54249c6fb7779e2a72b427ee79ed3eaad5 <19d2f0b97a131198efc2c4ca3eb7f980bba8c2b4; version=2345df54249c6fb7779e2a72b427ee79ed3eaad5 <2c32141462045cf93d54a5146a0ba572b83533dd; version=2345df54249c6fb7779e2a72b427ee79ed3eaad5 <d216a4bd138eb57cc4ae7c43b2f709e3482af7e2; version=2345df54249c6fb7779e2a72b427ee79ed3eaad5 <f7dc6f381a1e5f068333f1faa9265d6af1df4235; version=6.3

Published CVSS scores

7.1SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.4SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

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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