RHSA-2026:97486
Vulnerability from csaf_redhat - Published: 2026-11-10 20:32 - Updated: 2026-11-10 20:35Summary
Red Hat Security Advisory: dhcp security, bug fix, and enhancement update
Severity
Low
Notes
Topic: An update for dhcp is now available for Red Hat Enterprise Linux 9.
Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows individual devices on an IP network to get their own network configuration information, including an IP address, a subnet mask, and a broadcast address. The dhcp packages provide a relay agent and ISC DHCP service required to enable and administer DHCP on a network.
Security Fix(es):
* dhcp-server: dhcp-server: Persistent denial of service due to buffer overflow via OMAPI (CVE-2026-18103)
Bug Fix(es) and Enhancement(s):
* dhcpd dies constantly with "Error allocating fallback interface: invalid argument" (JIRA:RHEL-151420)
* Attempt to free pointer that is inside a structure in get_hw_addr2 (JIRA:RHEL-235872)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes linked from the References section.
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 dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the `print_hw_addr()` function. Successful exploitation leads to a persistent denial of service (DoS), causing the `dhcpd` service to crash and preventing it from restarting without manual intervention.
4.9 (Medium)
Affected products
Fixed
34 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-12:4.4.2-22.b1.el9.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-client-12:4.4.2-22.b1.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-client-12:4.4.2-22.b1.el9.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-client-12:4.4.2-22.b1.el9.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-client-12:4.4.2-22.b1.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-client-debuginfo-12:4.4.2-22.b1.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-client-debuginfo-12:4.4.2-22.b1.el9.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-client-debuginfo-12:4.4.2-22.b1.el9.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-client-debuginfo-12:4.4.2-22.b1.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-common-12:4.4.2-22.b1.el9.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-debuginfo-12:4.4.2-22.b1.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-debuginfo-12:4.4.2-22.b1.el9.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-debuginfo-12:4.4.2-22.b1.el9.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-debuginfo-12:4.4.2-22.b1.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-debugsource-12:4.4.2-22.b1.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-debugsource-12:4.4.2-22.b1.el9.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-debugsource-12:4.4.2-22.b1.el9.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-debugsource-12:4.4.2-22.b1.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-relay-12:4.4.2-22.b1.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-relay-12:4.4.2-22.b1.el9.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-relay-12:4.4.2-22.b1.el9.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-relay-12:4.4.2-22.b1.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-relay-debuginfo-12:4.4.2-22.b1.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-relay-debuginfo-12:4.4.2-22.b1.el9.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-relay-debuginfo-12:4.4.2-22.b1.el9.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-relay-debuginfo-12:4.4.2-22.b1.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-server-12:4.4.2-22.b1.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-server-12:4.4.2-22.b1.el9.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-server-12:4.4.2-22.b1.el9.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-server-12:4.4.2-22.b1.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-server-debuginfo-12:4.4.2-22.b1.el9.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-server-debuginfo-12:4.4.2-22.b1.el9.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-server-debuginfo-12:4.4.2-22.b1.el9.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.9.0.GA:dhcp-server-debuginfo-12:4.4.2-22.b1.el9.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Low
References
9 references
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"organization": "Red Hat",
"summary": "This issue was discovered by Red Hat."
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"cve": "CVE-2026-18103",
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"name": "Buffer Copy without Checking Size of Input"
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"ids": [
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"text": "2508081"
}
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{
"category": "description",
"text": "A flaw was found in dhcp-server. A remote attacker with network access to the OMAPI (Open Management Application Programming Interface) port, especially if not secured with TSIG (Transaction Signature) key authentication, could send a specially crafted lease creation request. This request, containing an overly long InfiniBand MAC address, triggers a buffer overflow in the `print_hw_addr()` function. Successful exploitation leads to a persistent denial of service (DoS), causing the `dhcpd` service to crash and preventing it from restarting without manual intervention.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "dhcp-server: dhcp-server: Persistent denial of service due to buffer overflow via OMAPI",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw has Moderate impact. A buffer overflow in the `dhcpd` service, exploitable via the OMAPI port (7911), can lead to a persistent denial of service. Exploitation requires network access to the OMAPI port, and if TSIG key authentication is not configured, no further credentials are needed. Successful exploitation crashes the `dhcpd` service, preventing its restart without manual intervention.",
"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"
}
],
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"details": "Low"
}
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"title": "dhcp-server: dhcp-server: Persistent denial of service due to buffer overflow via OMAPI"
}
]
}
Loading…
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.