RHSA-2026:41130
Vulnerability from csaf_redhat - Published: 2026-07-16 21:55 - Updated: 2026-08-27 13:03Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update
Severity
Important
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
busybox:
* busybox-1.37.0-8.1.hum1 (aarch64, x86_64)
* busybox-petitboot-1.37.0-8.1.hum1 (aarch64, x86_64)
* busybox-shared-1.37.0-8.1.hum1 (aarch64, x86_64)
* busybox-1.37.0-8.1.hum1.src (src)
Security Fix(es):
busybox:
* CVE-2026-38753
* CVE-2026-38754
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 Busybox. A use-after-free vulnerability in the awk_sub() function allows a remote attacker to cause a Denial of Service (DoS) by supplying a specially crafted AWK script. This can lead to the unavailability of the Busybox service.
7.5 (High)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:busybox-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:busybox-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:busybox-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in Busybox. This vulnerability, a heap overflow, exists within the `ifsbreakup()` function. A remote attacker could exploit this by providing specially crafted input, leading to a Denial of Service (DoS) condition. This means the affected system or application could become unavailable or unresponsive.
7.5 (High)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:busybox-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:busybox-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:busybox-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
17 references
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"text": "This update includes the following RPMs:\n\nbusybox:\n * busybox-1.37.0-8.1.hum1 (aarch64, x86_64)\n * busybox-petitboot-1.37.0-8.1.hum1 (aarch64, x86_64)\n * busybox-shared-1.37.0-8.1.hum1 (aarch64, x86_64)\n * busybox-1.37.0-8.1.hum1.src (src)\n\nSecurity Fix(es):\n\nbusybox:\n * CVE-2026-38753\n * CVE-2026-38754",
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"vulnerabilities": [
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"cve": "CVE-2026-38753",
"cwe": {
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"name": "Use After Free"
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"discovery_date": "2026-07-15T21:03:04.648506+00:00",
"ids": [
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"notes": [
{
"category": "description",
"text": "A flaw was found in Busybox. A use-after-free vulnerability in the awk_sub() function allows a remote attacker to cause a Denial of Service (DoS) by supplying a specially crafted AWK script. This can lead to the unavailability of the Busybox service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "busybox: Busybox: Denial of Service via crafted AWK script in awk_sub() function",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "BusyBox provides a single-binary implementation of many common UNIX utilities. A use-after-free flaw in the awk applet\u0027s awk_sub() function (a dangling repl pointer after as_regex()) allows a crafted AWK program to crash the busybox process, resulting in a denial of service. Exploitation requires supplying the malicious AWK script to busybox awk; busybox does not accept AWK programs over the network, so this is a local attack vector. Red Hat rates the impact of this flaw as Moderate.",
"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:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
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"url": "https://access.redhat.com/security/cve/CVE-2026-38753"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501183"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-38753"
},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-38753"
},
{
"category": "external",
"summary": "http://busybox.com",
"url": "http://busybox.com"
},
{
"category": "external",
"summary": "https://lists.busybox.net/pipermail/busybox/2026-June/092352.html",
"url": "https://lists.busybox.net/pipermail/busybox/2026-June/092352.html"
}
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"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": [
"Red Hat Hardened Images:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
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"url": "https://access.redhat.com/errata/RHSA-2026:41130"
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{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the criteria for vulnerability selection or Red Hat Product Security recommendation. Avoid processing untrusted AWK scripts with the busybox awk applet.",
"product_ids": [
"Red Hat Hardened Images:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
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"scores": [
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "busybox: Busybox: Denial of Service via crafted AWK script in awk_sub() function"
},
{
"cve": "CVE-2026-38754",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
"discovery_date": "2026-07-15T22:03:50.311044+00:00",
"ids": [
{
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"text": "2501210"
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"notes": [
{
"category": "description",
"text": "A flaw was found in Busybox. This vulnerability, a heap overflow, exists within the `ifsbreakup()` function. A remote attacker could exploit this by providing specially crafted input, leading to a Denial of Service (DoS) condition. This means the affected system or application could become unavailable or unresponsive.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "busybox: Busybox: Denial of Service via heap overflow in ifsbreakup() function",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "BusyBox is affected by a heap-based buffer overflow in the ash shell\u0027s ifsbreakup() function that can cause the shell to crash, resulting in a denial of service. The flaw is present only in BusyBox version 1.38.0. Red Hat has reviewed the versions of BusyBox shipped across its supported product portfolio and confirmed that current releases ship versions that predate 1.38.0 and do not contain the affected code. Where Red Hat does ship an affected version, a fix is being tracked and will be delivered through the standard update process.",
"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:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-38754"
},
{
"category": "external",
"summary": "RHBZ#2501210",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501210"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-38754",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-38754"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-38754",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-38754"
},
{
"category": "external",
"summary": "https://lists.busybox.net/pipermail/busybox/2026-June/092353.html",
"url": "https://lists.busybox.net/pipermail/busybox/2026-June/092353.html"
}
],
"release_date": "2026-07-15T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-16T21:55:58+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": [
"Red Hat Hardened Images:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:41130"
},
{
"category": "workaround",
"details": "No mitigation is required for the vast majority of Red Hat products, as they do not ship the affected BusyBox version. For any product confirmed to ship the affected version, limiting the ash shell to trusted, non-adversarial script input reduces exposure until an update is available.",
"product_ids": [
"Red Hat Hardened Images:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "busybox: Busybox: Denial of Service via heap overflow in ifsbreakup() function"
}
]
}
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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.
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.
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