RHSA-2026:69321
Vulnerability from csaf_redhat - Published: 2026-09-21 12:52 - Updated: 2026-09-21 17:22Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
efivar:
* efivar-39-13.1.hum1 (aarch64, x86_64)
* efivar-devel-39-13.1.hum1 (aarch64, x86_64)
* efivar-libs-39-13.1.hum1 (aarch64, x86_64)
* efivar-39-13.1.hum1.src (src)
Security Fix(es):
efivar:
* CVE-2026-6862
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 libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).
5.5 (Medium)
Affected products
Fixed
7 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:efivar-0:39-13.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:efivar-0:39-13.1.hum1@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:efivar-0:39-13.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:efivar-devel-0:39-13.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:efivar-devel-0:39-13.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:efivar-libs-0:39-13.1.hum1@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:efivar-libs-0:39-13.1.hum1@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
9 references
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"vulnerabilities": [
{
"acknowledgments": [
{
"names": [
"Mathis Huron"
],
"organization": "Oteria Cyber School, FuzzingLabs"
}
],
"cve": "CVE-2026-6862",
"cwe": {
"id": "CWE-674",
"name": "Uncontrolled Recursion"
},
"discovery_date": "2026-04-09T00:00:00+00:00",
"ids": [
{
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"text": "2459982"
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"notes": [
{
"category": "description",
"text": "A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node\u0027s Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "efivar: efivar: Denial of Service due to stack overflow in device path node parsing",
"title": "Vulnerability summary"
},
{
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"text": "Moderate impact. A stack overflow vulnerability in `libefiboot` (part of `efivar`) can lead to a process crash due to unbounded recursion when parsing a specially crafted device path node. This flaw affects Red Hat Enterprise Linux 8, 9, and 10, as well as Fedora and OpenShift Container Platform.",
"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": {
"fixed": [
"Red Hat Hardened Images:efivar-0:39-13.1.hum1@aarch64",
"Red Hat Hardened Images:efivar-0:39-13.1.hum1@src",
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"Red Hat Hardened Images:efivar-libs-0:39-13.1.hum1@x86_64"
]
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"summary": "RHBZ#2459982",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459982"
},
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-6862"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-6862",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-6862"
}
],
"release_date": "2026-04-09T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-21T12:52:10+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/",
"product_ids": [
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"Red Hat Hardened Images:efivar-libs-0:39-13.1.hum1@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:69321"
},
{
"category": "workaround",
"details": "Applications using efi_loadopt_is_valid() should validate the size of the input buffer before passing it to libefiboot. As a library-level fix, the device path iterator should enforce a minimum node Length of 4 before recursing:\n\n if (dp-\u003elength \u003c 4)\n return -1;",
"product_ids": [
"Red Hat Hardened Images:efivar-0:39-13.1.hum1@aarch64",
"Red Hat Hardened Images:efivar-0:39-13.1.hum1@src",
"Red Hat Hardened Images:efivar-0:39-13.1.hum1@x86_64",
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]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:efivar-0:39-13.1.hum1@aarch64",
"Red Hat Hardened Images:efivar-0:39-13.1.hum1@src",
"Red Hat Hardened Images:efivar-0:39-13.1.hum1@x86_64",
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"Red Hat Hardened Images:efivar-libs-0:39-13.1.hum1@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "efivar: efivar: Denial of Service due to stack overflow in device path node parsing"
}
]
}
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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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