RHSA-2026:71668
Vulnerability from csaf_redhat - Published: 2026-09-24 17:47 - Updated: 2026-10-02 13:59Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
crun:
* crun-1.30-1.hum1 (aarch64, x86_64)
* crun-krun-1.30-1.hum1 (aarch64, x86_64)
* crun-wasm-1.30-1.hum1 (aarch64, x86_64)
* crun-1.30-1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in crun. When the container configuration does not give /dev a dedicated mount, terminal setup can redirect /dev/console onto an attacker-controlled path, including via the read-only-rootfs bind-mount fallback. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.
5.6 (Medium)
Affected products
Fixed
7 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:crun-0:1.30-1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:crun-0:1.30-1.hum1@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:crun-0:1.30-1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file's ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.
5.6 (Medium)
Affected products
Fixed
7 products, the same list as for
CVE-2026-88264
Threats
Impact
Moderate
References
15 references
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"ids": [
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"notes": [
{
"category": "description",
"text": "A flaw was found in crun. When the container configuration does not give /dev a dedicated mount, terminal setup can redirect /dev/console onto an attacker-controlled path, including via the read-only-rootfs bind-mount fallback. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.",
"title": "Vulnerability description"
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"text": "crun: crun: /dev/console symlink follow allows root-owned file creation outside the rootfs",
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],
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"Red Hat Hardened Images:crun-0:1.30-1.hum1@src",
"Red Hat Hardened Images:crun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@x86_64"
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"date": "2026-09-24T17:47:02+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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"Red Hat Hardened Images:crun-0:1.30-1.hum1@src",
"Red Hat Hardened Images:crun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@x86_64",
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"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@x86_64"
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"url": "https://access.redhat.com/errata/RHSA-2026:71668"
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{
"category": "workaround",
"details": "Always mount /dev (Podman/crun default). Do not run untrusted images with a /dev-less config.",
"product_ids": [
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
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"Red Hat Hardened Images:crun-0:1.30-1.hum1@src",
"Red Hat Hardened Images:crun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@x86_64",
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"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@x86_64"
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "crun: crun: /dev/console symlink follow allows root-owned file creation outside the rootfs"
},
{
"cve": "CVE-2026-88265",
"cwe": {
"id": "CWE-59",
"name": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)"
},
"discovery_date": "2026-09-09T16:44:11.725000+00:00",
"ids": [
{
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"notes": [
{
"category": "description",
"text": "A flaw was found in crun. After pivot_root, reopening /dev/null for stdio can follow a symlink and attach a host file to container stdio, then change that file\u0027s ownership. Affected versions are crun 1.29.1 and earlier. Default configurations that mount a fresh /dev are not exposed. No fixed release is available yet.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate flaw in crun allows a non-root container process to write to and change ownership of a host bind-mounted file. Exploitation requires a malicious container image to replace /dev/null with a symlink while /dev is not mounted within the container, indicating specific preconditions for successful attack.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"Red Hat Hardened Images:crun-0:1.30-1.hum1@src",
"Red Hat Hardened Images:crun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@x86_64"
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"references": [
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{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-88265"
},
{
"category": "external",
"summary": "https://github.com/containers/crun/",
"url": "https://github.com/containers/crun/"
}
],
"release_date": "2026-09-09T00:00:00+00:00",
"remediations": [
{
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"date": "2026-09-24T17:47:02+00:00",
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"product_ids": [
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"Red Hat Hardened Images:crun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:71668"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
"product_ids": [
"Red Hat Hardened Images:crun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-0:1.30-1.hum1@src",
"Red Hat Hardened Images:crun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.6,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:crun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-0:1.30-1.hum1@src",
"Red Hat Hardened Images:crun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-krun-0:1.30-1.hum1@x86_64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@aarch64",
"Red Hat Hardened Images:crun-wasm-0:1.30-1.hum1@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "crun: crun: /dev/null symlink follow during stdio reopen allows host bind-mount write and chown"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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