CVE-2026-23384

Kernel stack disclosure via uninitialized CQ response

Published Mar 25, 2026 · Updated Mar 25, 2026

Information disclosure in Linux Kernel 6.18 allows local users to read up to 11 bytes of kernel stack through an ionic RDMA CQ request. The ionic_create_cq() path returns an ionic_cq_resp structure without clearing seven reserved bytes and can leave cqid[1] unset. Exploitation requires local low-privileged access, an AMD Pensando DSC with ionic RDMA enabled, and the ability to create a completion queue.

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

Information disclosure in Linux Kernel 6.18 allows local users to read up to 11 bytes of kernel stack through an ionic RDMA CQ request. The ionic_create_cq() path returns an ionic_cq_resp structure without clearing seven reserved bytes and can leave cqid[1] unset. Exploitation requires local low-privileged access, an AMD Pensando DSC with ionic RDMA enabled, and the ability to create a completion queue.

The record

CVE
CVE-2026-23384
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 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=6.18
  2. Affected versionversion=e8521822c733c6deab0f339843cd37cd62c12795 <547d0b07ad73915b323bc21f85c5d3252bebbbcf
  3. Affected versionversion=e8521822c733c6deab0f339843cd37cd62c12795 <a6f3e0fa8e862f220c26c2f27e5ddc42eb82ad3e
  4. Affected versionversion=e8521822c733c6deab0f339843cd37cd62c12795 <faa72102b178c7ae6c6afea23879e7c84fc59b4e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.18; version=e8521822c733c6deab0f339843cd37cd62c12795 <547d0b07ad73915b323bc21f85c5d3252bebbbcf; version=e8521822c733c6deab0f339843cd37cd62c12795 <a6f3e0fa8e862f220c26c2f27e5ddc42eb82ad3e; version=e8521822c733c6deab0f339843cd37cd62c12795 <faa72102b178c7ae6c6afea23879e7c84fc59b4e

Published CVSS scores

5.5NIST NVDCVSS: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
T1005Data from Local System

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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