CVE-2024-41027

Kernel warning via unsupported userfaultfd feature request

Published Jul 29, 2024 · Updated May 11, 2026

Improper feature validation in affected Linux kernels allows local users to trigger a kernel warning through a userfaultfd ioctl. The userfaultfd_api function validates globally known feature bits before removing features excluded by the kernel configuration, allowing an unavailable feature request to succeed instead of returning EINVAL. A local process must request UFFD_FEATURE_WP_UNPOPULATED on a kernel built without CONFIG_PTE_MARKER_UFFD_WP; subsequent use can reach zap_pte_range and emit the warning.

CVSS severity3.3
Low
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper feature validation in affected Linux kernels allows local users to trigger a kernel warning through a userfaultfd ioctl. The userfaultfd_api function validates globally known feature bits before removing features excluded by the kernel configuration, allowing an unavailable feature request to succeed instead of returning EINVAL. A local process must request UFFD_FEATURE_WP_UNPOPULATED on a kernel built without CONFIG_PTE_MARKER_UFFD_WP; subsequent use can reach zap_pte_range and emit the warning.

The record

CVE
CVE-2024-41027
Published
Jul 29, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 29, 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=5.7
  2. Affected versionversion=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <14875fd5f9bcf60ac5518c63bfb676ade44aa7c6
  3. Affected versionversion=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <1723f04caacb32cadc4e063725d836a0c4450694
  4. Affected versionversion=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <519547760f16eae7803d2658d9524bc5ba7a20a7
  5. Affected versionversion=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <8111f902b7c95d75fc80c7e577f5045886c6b384
  6. Affected versionversion=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <cd94cac4069a763ab5206be2c64c9a8beae590ba

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.7; version=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <14875fd5f9bcf60ac5518c63bfb676ade44aa7c6; version=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <1723f04caacb32cadc4e063725d836a0c4450694; version=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <519547760f16eae7803d2658d9524bc5ba7a20a7; version=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <8111f902b7c95d75fc80c7e577f5045886c6b384; version=e06f1e1dd4998ffc9da37f580703b55a93fc4de4 <cd94cac4069a763ab5206be2c64c9a8beae590ba

Published CVSS scores

3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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