RHSA-2026:66287
Vulnerability from csaf_redhat - Published: 2026-09-10 01:41 - Updated: 2026-09-10 17:23Summary
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:
polkit:
* polkit-127-5.1.hum1 (aarch64, x86_64)
* polkit-devel-127-5.1.hum1 (aarch64, x86_64)
* polkit-docs-127-5.1.hum1 (noarch)
* polkit-libs-127-5.1.hum1 (aarch64, x86_64)
* polkit-127-5.1.hum1.src (src)
Security Fix(es):
polkit:
* CVE-2026-85498
* CVE-2026-4897
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 polkit. A local user can exploit this by providing a specially crafted, excessively long input to the `polkit-agent-helper-1` setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system.
5.5 (Medium)
Affected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:polkit-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:polkit-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:polkit-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:polkit-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
No description is available for this CVE.
CWE-125 - Out-of-bounds ReadAffected products
Fixed
4 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:polkit-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:polkit-main@noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:polkit-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:polkit-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Low
References
14 references
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"text": "This update includes the following RPMs:\n\npolkit:\n * polkit-127-5.1.hum1 (aarch64, x86_64)\n * polkit-devel-127-5.1.hum1 (aarch64, x86_64)\n * polkit-docs-127-5.1.hum1 (noarch)\n * polkit-libs-127-5.1.hum1 (aarch64, x86_64)\n * polkit-127-5.1.hum1.src (src)\n\nSecurity Fix(es):\n\npolkit:\n * CVE-2026-85498\n * CVE-2026-4897",
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"vulnerabilities": [
{
"cve": "CVE-2026-4897",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-03-26T14:24:01.176000+00:00",
"ids": [
{
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"text": "2451739"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in polkit. A local user can exploit this by providing a specially crafted, excessively long input to the `polkit-agent-helper-1` setuid binary via standard input (stdin). This unbounded input can lead to an out-of-memory (OOM) condition, resulting in a Denial of Service (DoS) for the system.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "polkit: Polkit: Denial of Service via unbounded input processing through standard input",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A moderate severity issue, a denial of service flaw exists in polkit where a local attacker can exhaust system memory. This vulnerability arises from the `polkit-agent-helper-1` setuid binary processing excessively long input via standard input without size limitations, leading to an out-of-memory condition.",
"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:polkit-main@aarch64",
"Red Hat Hardened Images:polkit-main@noarch",
"Red Hat Hardened Images:polkit-main@src",
"Red Hat Hardened Images:polkit-main@x86_64"
]
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},
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451739"
},
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"summary": "https://www.cve.org/CVERecord?id=CVE-2026-4897",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-4897"
},
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}
],
"release_date": "2026-03-26T12:34:00+00:00",
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"date": "2026-09-10T01:41:30+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:polkit-main@aarch64",
"Red Hat Hardened Images:polkit-main@noarch",
"Red Hat Hardened Images:polkit-main@src",
"Red Hat Hardened Images:polkit-main@x86_64"
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"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:polkit-main@aarch64",
"Red Hat Hardened Images:polkit-main@noarch",
"Red Hat Hardened Images:polkit-main@src",
"Red Hat Hardened Images:polkit-main@x86_64"
]
}
],
"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": [
"Red Hat Hardened Images:polkit-main@aarch64",
"Red Hat Hardened Images:polkit-main@noarch",
"Red Hat Hardened Images:polkit-main@src",
"Red Hat Hardened Images:polkit-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "polkit: Polkit: Denial of Service via unbounded input processing through standard input"
},
{
"acknowledgments": [
{
"names": [
"Juthawong Naisanguansee"
]
}
],
"cve": "CVE-2026-85498",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-09-04T00:40:47.865000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2528347"
}
],
"notes": [
{
"category": "description",
"text": "No description is available for this CVE.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "polkit: Regression in CVE-2026-4897 fix (polkit read_cookie()) - stack buffer underflow",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue is classified as Low severity because there is no observable effect of the one byte out-of-bounds read. No information disclosure or affect to integrity has been demonstrated.",
"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:polkit-main@aarch64",
"Red Hat Hardened Images:polkit-main@noarch",
"Red Hat Hardened Images:polkit-main@src",
"Red Hat Hardened Images:polkit-main@x86_64"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-85498"
},
{
"category": "external",
"summary": "RHBZ#2528347",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2528347"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-85498",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-85498"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-85498",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-85498"
}
],
"release_date": "2026-09-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-10T01:41:30+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:polkit-main@aarch64",
"Red Hat Hardened Images:polkit-main@noarch",
"Red Hat Hardened Images:polkit-main@src",
"Red Hat Hardened Images:polkit-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:66287"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the criteria for a mitigation as defined by the Red Hat Product Security team. This flaw remains subject to future review as new information becomes available. Exposure is limited: the defect is reachable only by a local/adjacent low-privileged user interacting with the polkit authentication agent and results at most in a crash (availability) of the affected process.",
"product_ids": [
"Red Hat Hardened Images:polkit-main@aarch64",
"Red Hat Hardened Images:polkit-main@noarch",
"Red Hat Hardened Images:polkit-main@src",
"Red Hat Hardened Images:polkit-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "ADJACENT_NETWORK",
"availabilityImpact": "LOW",
"baseScore": 3.5,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:polkit-main@aarch64",
"Red Hat Hardened Images:polkit-main@noarch",
"Red Hat Hardened Images:polkit-main@src",
"Red Hat Hardened Images:polkit-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "polkit: Regression in CVE-2026-4897 fix (polkit read_cookie()) - stack buffer underflow"
}
]
}
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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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