CVE-2026-30892Public exploit

Privilege escalation via skipped UID assignment

Published Mar 25, 2026 · Updated Mar 26, 2026

Privilege escalation in Containers crun 1.19 through 1.26 allows local users to run crun exec processes as UID 0 via --user 1. The make_oci_process_user function returns a newly allocated user object before assigning the parsed UID when USERSPEC contains only a UID, leaving the UID at its zero-initialized value. Exploitation requires permission to invoke crun exec against a running container and grants UID 0 within that execution context rather than the requested UID 1.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Containers crun 1.19 through 1.26 allows local users to run crun exec processes as UID 0 via --user 1. The make_oci_process_user function returns a newly allocated user object before assigning the parsed UID when USERSPEC contains only a UID, leaving the UID at its zero-initialized value. Exploitation requires permission to invoke crun exec against a running container and grants UID 0 within that execution context rather than the requested UID 1.

The record

CVE
CVE-2026-30892
Published
Mar 25, 2026
Updated
Mar 26, 2026
Vendor
Containers
Product
crun
Classifications
CWE-269, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 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=>= 1.19, < 1.27

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Containers · crunversion=>= 1.19, < 1.27

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.0GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1068Exploitation for Privilege Escalation

Public exploit references

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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