CVE-2024-50220

System crash via incomplete fork address space

Published Nov 9, 2024 · Updated May 11, 2026

Race condition in Linux kernel 6.8 through 6.11.6 allows local users to crash the system by triggering a failed fork with userfaultfd. dup_userfaultfd_complete() unconditionally reports UFFD_EVENT_FORK after an error, exposing a child address space whose maple-tree entries can remain inconsistent. Exploitation requires local access, a registered userfaultfd fork handler, and success in a high-complexity fork-error race.

CVSS severity4.7
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux kernel 6.8 through 6.11.6 allows local users to crash the system by triggering a failed fork with userfaultfd. dup_userfaultfd_complete() unconditionally reports UFFD_EVENT_FORK after an error, exposing a child address space whose maple-tree entries can remain inconsistent. Exploitation requires local access, a registered userfaultfd fork handler, and success in a high-complexity fork-error race.

The record

CVE
CVE-2024-50220
Published
Nov 9, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 9, 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=6.8
  2. Affected versionversion=d2406291483775ecddaee929231a39c70c08fda2 <92b472945dbf8abc020e9259c0088026f7027dfc
  3. Affected versionversion=d2406291483775ecddaee929231a39c70c08fda2 <f64e67e5d3a45a4a04286c47afade4b518acd47b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.8; version=d2406291483775ecddaee929231a39c70c08fda2 <92b472945dbf8abc020e9259c0088026f7027dfc; version=d2406291483775ecddaee929231a39c70c08fda2 <f64e67e5d3a45a4a04286c47afade4b518acd47b

Published CVSS scores

4.7UbuntuCVSS:3.1/AV:L/AC:H/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-367Time-of-check Time-of-use (TOCTOU) Race Condition

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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