NVD / CVE Program· CNA redhat

CVE-2026-84042: Crun: crun: rootful krun with passt executes container payload as host root

HighCVSS 7.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 31/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.10% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
Fixed version: crun (Alpine:v3.24) 1.30.1-r0; crun (openSUSE:Tumbleweed) 1.30.1-1.1.

Low priority for now. Upgrade to crun (Alpine:v3.24) 1.30.1-r0; crun (openSUSE:Tumbleweed) 1.30.1-1.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29

Local privilege escalation

Published: Sep 10, 2026
Updated: Nov 11, 2026
EPSS: 0.1% · 0th percentile
CWE: CWE-269

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · redhat: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

Red Hat Red Hat Enterprise Linux 10
- 0:1.30.1-1.el10_3 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 8
- all versionsunknown
Red Hat Red Hat Enterprise Linux 9
- 0:1.29.1-1.el9 and laternot affected · rpm
Red Hat Red Hat Hardened Images
- all versionsunknown
Red Hat Red Hat OpenShift Container Platform 4
- all versionsunknown
- all versionsunknown
- all versionsunknown
Red Hat Red Hat OpenShift Container Platform 5
- all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Alpine:v3.24	crun	before 1.30.1-r0	1.30.1-r0
openSUSE:Tumbleweed	crun	before 1.30.1-1.1	1.30.1-1.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

CVE-2025-10230Samba: command injection in wins server hook script
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CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
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CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
39Monitor

Published before and after this one in the same product

← EarlierCVE-2026-18147Sep 9, 2026 · Freeipa: ipa: freeipa/idm: cross-site scripting vulnerability allows arbitrary code execution via crafted url
32Monitor
← EarlierCVE-2026-87853Sep 9, 2026 · Sssd: sssd: idp authentication prefix comparison allows cross-user impersonation
30Monitor
Later →CVE-2026-88265Sep 10, 2026 · Crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown
22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
alpine:crun	1.30.1-r0 · Alpine:v3.24	Package registry (OSV)
opensuse:crun	1.30.1-1.1 · openSUSE:Tumbleweed	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2025-11561336 days apartSssd: sssd default kerberos configuration allows privilege escalation on ad-joined linux systems
35Monitor
CVE-2026-1810744 days apartCriu: criu: container escape via rseq critical section hijack during checkpoint/restore
31Monitor
CVE-2026-1674348 days apartAccountsservice: accountsservice: arbitrary file read via seticonfile for systemd-homed users
22Monitor

Not on record for this CVE: patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Local
Attack complexity: High
Privileges required: Low
User interaction: None
Scope: Changed
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-269 · Improper Privilege Management

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

nvd-secondary

Root cause

To simplify setup, a service account is granted broad, cluster-wide permissions. The principle of least privilege is skipped during installation.

The bug in code

The whole CWE-269 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

yaml

1kind: ClusterRole
2rules:
3  - apiGroups: ["*"]
4    resources: ["*"]
5    verbs: ["*"]

Fixed

yaml

1kind: Role
2metadata:
3  namespace: lodos-system
4rules:
5  - apiGroups: ["apps"]
6    resources: ["deployments"]
7    verbs: ["get", "list", "update"]

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Abuse Elevation Control MechanismT1548

Change log (1)

Fix✗ → ✓Oct 18, 2026, 9:53 PM UTC

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References

access.redhat.com/errata/RHSA-2026:97561

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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