RHSA-2026:42074
Vulnerability from csaf_redhat - Published: 2026-07-20 15:17 - Updated: 2026-07-21 11:06Summary
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:
busybox:
* busybox-1.37.0-8.2.hum1 (aarch64, x86_64)
* busybox-petitboot-1.37.0-8.2.hum1 (aarch64, x86_64)
* busybox-shared-1.37.0-8.2.hum1 (aarch64, x86_64)
* busybox-1.37.0-8.2.hum1.src (src)
Security Fix(es):
busybox:
* CVE-2026-38752
* CVE-2026-38755
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. This vulnerability, a stack overflow in the evaluate() function, allows a remote attacker to cause a Denial of Service (DoS) by providing a specially crafted AWK script. A Denial of Service attack can make the affected system or application unavailable to legitimate users.
6.5 (Medium)
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. A heap overflow vulnerability in the `evalcommand()` function allows attackers to cause a Denial of Service (DoS) by supplying a specially crafted input. This can lead to the unavailability of the service.
5.5 (Medium)
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
References
18 references
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"ids": [
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"text": "2501204"
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"notes": [
{
"category": "description",
"text": "A flaw was found in BusyBox. This vulnerability, a stack overflow in the evaluate() function, allows a remote attacker to cause a Denial of Service (DoS) by providing a specially crafted AWK script. A Denial of Service attack can make the affected system or application unavailable to legitimate users.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "busybox: BusyBox: Denial of Service via crafted AWK script",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate flaw in BusyBox\u0027s AWK interpreter allows a denial of service. An attacker could provide a specially crafted AWK script, leading to a stack overflow and making the BusyBox instance unresponsive. This vulnerability primarily affects systems where BusyBox is configured to execute untrusted AWK scripts, limiting its broader impact.",
"title": "Statement"
},
{
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"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"
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],
"product_status": {
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"Red Hat Hardened Images:busybox-main@aarch64",
"Red Hat Hardened Images:busybox-main@src",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-38752"
},
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"category": "external",
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"url": "http://busybox.com"
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{
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"url": "https://lists.busybox.net/pipermail/busybox/2026-June/092351.html"
}
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{
"category": "vendor_fix",
"date": "2026-07-20T15:17:42+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:busybox-main@src",
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"details": "For systems utilizing BusyBox, limit exposure by avoiding the execution of untrusted AWK scripts. Ensure that BusyBox instances are not configured to process arbitrary or untrusted AWK script input, particularly in environments where BusyBox is used for critical system functions.",
"product_ids": [
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"scores": [
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 6.5,
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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}
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"threats": [
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"details": "Moderate"
}
],
"title": "busybox: BusyBox: Denial of Service via crafted AWK script"
},
{
"cve": "CVE-2026-38755",
"cwe": {
"id": "CWE-120",
"name": "Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)"
},
"discovery_date": "2026-07-15T22:01:48.825769+00:00",
"ids": [
{
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"notes": [
{
"category": "description",
"text": "A flaw was found in Busybox. A heap overflow vulnerability in the `evalcommand()` function allows attackers to cause a Denial of Service (DoS) by supplying a specially crafted input. This can lead to the unavailability of the service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "busybox: Busybox: Denial of Service via heap overflow in evalcommand() function",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate impact flaw in Busybox\u0027s `evalcommand()` function can lead to a Denial of Service. The vulnerability requires an attacker to supply specially crafted input, which typically implies existing local access or specific application interactions within the Busybox environment, thus limiting the direct exposure.",
"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": [
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-38755"
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2501194"
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-38755"
},
{
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-38755"
},
{
"category": "external",
"summary": "https://busybox.com",
"url": "https://busybox.com"
},
{
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"summary": "https://lists.busybox.net/pipermail/busybox/2026-June/092354.html",
"url": "https://lists.busybox.net/pipermail/busybox/2026-June/092354.html"
}
],
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{
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"date": "2026-07-20T15:17:42+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:busybox-main@src",
"Red Hat Hardened Images:busybox-main@x86_64"
],
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{
"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": [
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
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"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 heap overflow in evalcommand() 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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