CVE-2026-84042

Low-privilege host-root execution via container-controlled passt lookup

Published Sep 10, 2026 · Updated Sep 10, 2026

Privilege escalation in Red Hat Hardened Images with crun 1.29 and later allows local users to execute code as host root. The libkrun_start_passt routine invokes passt by name through execvp after container mounts are established, allowing an image-supplied executable to be selected. Exploitation requires a libkrun-enabled build, a rootful container start, passt networking enabled through krun.use_passt, and attacker control of the image.

CVSS severity7.8
High
EPSS probability0.10%
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 Red Hat Hardened Images with crun 1.29 and later allows local users to execute code as host root. The libkrun_start_passt routine invokes passt by name through execvp after container mounts are established, allowing an image-supplied executable to be selected. Exploitation requires a libkrun-enabled build, a rootful container start, passt networking enabled through krun.use_passt, and attacker control of the image.

The record

CVE
CVE-2026-84042
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
389 Directory Server
Product
Red Hat Hardened Images
Classifications
CWE-269, T1611
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 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?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Hardened ImagesAffected versions are unavailable in this record.

Published CVSS scores

7.8Red HatCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/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-269Improper Privilege Management
T1611Escape to Host

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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