CVE-2024-38661

System crash via overflowing relative AP masks

Published Jun 25, 2024 · Updated May 11, 2026

Integer overflow in the s390 AP bus code in affected Linux kernels allows attackers to crash the system through a crafted sysfs mask. The ap_parse_bitmap_str path stores relative-mask numeric values in signed int variables, so values above INT_MAX overflow despite existing range checks. The operation requires local write access to /sys/bus/ap/apmask or aqmask on an s390 system with the AP bus, and a fatal oops can panic the host.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the s390 AP bus code in affected Linux kernels allows attackers to crash the system through a crafted sysfs mask. The ap_parse_bitmap_str path stores relative-mask numeric values in signed int variables, so values above INT_MAX overflow despite existing range checks. The operation requires local write access to /sys/bus/ap/apmask or aqmask on an s390 system with the AP bus, and a fatal oops can panic the host.

The record

CVE
CVE-2024-38661
Published
Jun 25, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jun 25, 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

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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=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <2062e3f1f2374102f8014d7ca286b9aa527bd558
  2. Affected versionversion=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <4c0bfb4e867c1ec6616a5049bd3618021e127056
  3. Affected versionversion=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <67011123453b91ec03671d40712fa213e94a01b9
  4. Affected versionversion=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <7360cef95aa1ea2b5efb7b5e2ed32e941664e1f0
  5. Affected versionversion=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <7c72af16abf2ec7520407098360bbba312289e05
  6. Affected versionversion=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <7dabe54a016defe11bb2a278cd9f1ff6db3feba6
  7. Affected versionversion=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <8c5f5911c1b13170d3404eb992c6a0deaa8d81ad
  8. Affected versionversion=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <d4f9d5a99a3fd1b1c691b7a1a6f8f3f25f4116c9
  9. Affected versionversion=4.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <2062e3f1f2374102f8014d7ca286b9aa527bd558; version=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <4c0bfb4e867c1ec6616a5049bd3618021e127056; version=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <67011123453b91ec03671d40712fa213e94a01b9; version=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <7360cef95aa1ea2b5efb7b5e2ed32e941664e1f0; version=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <7c72af16abf2ec7520407098360bbba312289e05; version=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <7dabe54a016defe11bb2a278cd9f1ff6db3feba6; version=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <8c5f5911c1b13170d3404eb992c6a0deaa8d81ad; version=3d8f60d38e249f989a7fca9c2370c31c3d5487e1 <d4f9d5a99a3fd1b1c691b7a1a6f8f3f25f4116c9; version=4.19

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
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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