CVE-2024-42158

Local key disclosure via incomplete heap clearing

Published Jul 30, 2024 · Updated May 11, 2026

Information disclosure in the Linux s390 protected-key API allows local users to recover residual cryptographic key material. Three pkey ioctl paths clear only the requested key length before freeing heap buffers, leaving allocator padding that can retain cryptographic data. Exploitation requires high-privilege local access on an s390 system using the protected-key device, and the documented impact is key-material disclosure only.

CVSS severity4.1
Medium
EPSS probability0.19%
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 Linux s390 protected-key API allows local users to recover residual cryptographic key material. Three pkey ioctl paths clear only the requested key length before freeing heap buffers, leaving allocator padding that can retain cryptographic data. Exploitation requires high-privilege local access on an s390 system using the protected-key device, and the documented impact is key-material disclosure only.

The record

CVE
CVE-2024-42158
Published
Jul 30, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-669, T1005
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 30, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.11
  2. Affected versionversion=e80d4af0a320972aac58e2004d0ba4e44ef4c5c7 <22e6824622e8a8889df0f8fc4ed5aea0e702a694
  3. Affected versionversion=e80d4af0a320972aac58e2004d0ba4e44ef4c5c7 <62151a0acde90823bdfa991d598c85cf4b1d387d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=4.11; version=e80d4af0a320972aac58e2004d0ba4e44ef4c5c7 <22e6824622e8a8889df0f8fc4ed5aea0e702a694; version=e80d4af0a320972aac58e2004d0ba4e44ef4c5c7 <62151a0acde90823bdfa991d598c85cf4b1d387d

Published CVSS scores

4.1NIST NVDCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N

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

CWE-669Incorrect Resource Transfer Between Spheres
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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