CVE-2024-40635

Container-root execution via unchecked UID conversion

Published Mar 17, 2025 · Updated May 4, 2025

Integer overflow in containerd allows local users with image-import rights to run a crafted container as root inside it. The oci.WithUser option parses each numeric UID and GID as a native integer, then converts it to uint32 without enforcing runc's signed 32-bit limit. Import and container-launch permissions are required, and the consequence is root identity inside the container rather than host-root execution.

CVSS severity4.6
Medium
EPSS probability0.29%
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 containerd allows local users with image-import rights to run a crafted container as root inside it. The oci.WithUser option parses each numeric UID and GID as a native integer, then converts it to uint32 without enforcing runc's signed 32-bit limit. Import and container-launch permissions are required, and the consequence is root identity inside the container rather than host-root execution.

The record

CVE
CVE-2024-40635
Published
Mar 17, 2025
Updated
May 4, 2025
Vendor
containerd
Product
containerd
Classifications
CWE-190, T1068
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Mar 17, 2025CVE publishedPublication date reported by the CVE source.
  2. May 4, 2025Record 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=< 1.6.38
  2. Affected versionversion=>= 1.7.0-beta.0, < 1.7.27
  3. Affected versionversion=>= 2.0.0-beta.0, < 2.0.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

containerd · containerdversion=< 1.6.38; version=>= 1.7.0-beta.0, < 1.7.27; version=>= 2.0.0-beta.0, < 2.0.4

Published CVSS scores

4.6GitHubCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:L/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-190Integer Overflow or Wraparound
T1068Exploitation for Privilege Escalation

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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