CVE-2026-23335

Kernel-stack disclosure via uninitialized reserved response bytes

Published Mar 25, 2026 · Updated Mar 25, 2026

Information disclosure in the irdma driver in affected Linux Kernel releases allows local users to read four bytes of kernel stack memory. irdma_create_user_ah() assigns only ah_id in the eight-byte irdma_create_ah_resp structure before ib_respond_udata() copies the whole structure to user space, leaving rsvd[4] uninitialized. The user must have local low-privileged access and create an irdma user address handle; each successful response exposes four otherwise uninitialized bytes.

CVSS severity5.5
Medium
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

Information disclosure in the irdma driver in affected Linux Kernel releases allows local users to read four bytes of kernel stack memory. irdma_create_user_ah() assigns only ah_id in the eight-byte irdma_create_ah_resp structure before ib_respond_udata() copies the whole structure to user space, leaving rsvd[4] uninitialized. The user must have local low-privileged access and create an irdma user address handle; each successful response exposes four otherwise uninitialized bytes.

The record

CVE
CVE-2026-23335
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
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

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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=5.14
  2. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <14b47c07c69930254f549a17ee245c80a65b1609
  3. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <1b1fac4c7a3ab7f52e9cfb91e5c91216646ca4d8
  4. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <2fd37450d271d74b3847baed284f9cfdf198c6f8
  5. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <74586c6da9ea222a61c98394f2fc0a604748438c
  6. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <c9bd0007c4bdb7806bbd323287e50f9cf467c51a
  7. Affected versionversion=b48c24c2d710cf34810c555dcef883a3d35a9c08 <cfe962216c164fe2b1c1fb6ac925a7413f5abc84

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.14; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <14b47c07c69930254f549a17ee245c80a65b1609; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <1b1fac4c7a3ab7f52e9cfb91e5c91216646ca4d8; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <2fd37450d271d74b3847baed284f9cfdf198c6f8; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <74586c6da9ea222a61c98394f2fc0a604748438c; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <c9bd0007c4bdb7806bbd323287e50f9cf467c51a; version=b48c24c2d710cf34810c555dcef883a3d35a9c08 <cfe962216c164fe2b1c1fb6ac925a7413f5abc84

Published CVSS scores

3.3Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
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

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

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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