RHSA-2026:24347
Vulnerability from csaf_redhat - Published: 2026-06-08 03:17 - Updated: 2026-07-20 23:28Summary
Red Hat Security Advisory: frr security update
Severity
Important
Notes
Topic: An update for frr is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. 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: FRRouting is free software that manages TCP/IP based routing protocols. It supports BGP4, OSPFv2, OSPFv3, ISIS, RIP, RIPng, PIM, NHRP, PBR, EIGRP and BFD.
Security Fix(es):
* frr: denial of service via crafted FlowSpec component (CVE-2026-37457)
* frr: denial of service via crafted BGP UPDATE message (CVE-2026-37459)
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.
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 FRRouting (FRR). A remote attacker can exploit an off-by-one out-of-bounds write vulnerability in the `bgp_flowspec_op_decode()` function by supplying a specially crafted FlowSpec component. This issue can lead to a Denial of Service (DoS).
7.5 (High)
Affected products
Fixed
14 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.aarch64 | — |
Vendor Fix
fix
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| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.ppc64le | — |
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fix
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| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
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| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.src | — |
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| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.ppc64le | — |
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fix
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| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
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| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-10.2.Z:frr-selinux-0:10.4.4-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in FRRouting (FRR). An unauthenticated remote attacker can exploit an integer underflow vulnerability by supplying a specially crafted BGP (Border Gateway Protocol) UPDATE message. This issue can lead to a Denial of Service (DoS).
7.5 (High)
Affected products
Fixed
14 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.src | — |
Vendor Fix
fix
Workaround
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|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-selinux-0:10.4.4-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in FRRouting (FRR). Missing input validation in the `rfapiRibBi2Ri()` function allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted BGP (Border Gateway Protocol) UPDATE message. This vulnerability can disrupt network services managed by FRR.
7.5 (High)
Affected products
Fixed
14 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-0:10.4.4-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debuginfo-0:10.4.4-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-debugsource-0:10.4.4-1.el10_2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:frr-selinux-0:10.4.4-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
23 references
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "frr: denial of service via crafted BGP UPDATE message"
},
{
"cve": "CVE-2026-37460",
"cwe": {
"id": "CWE-1286",
"name": "Improper Validation of Syntactic Correctness of Input"
},
"discovery_date": "2026-06-03T15:02:19.957289+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2484385"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in FRRouting (FRR). Missing input validation in the `rfapiRibBi2Ri()` function allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted BGP (Border Gateway Protocol) UPDATE message. This vulnerability can disrupt network services managed by FRR.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "frr: FRRouting: Denial of Service via crafted BGP UPDATE message",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important flaw in FRRouting (FRR) allows a remote, unauthenticated attacker to trigger a denial of service by sending a specially crafted BGP UPDATE message. This can lead to the disruption of network services managed by FRR instances configured to handle BGP traffic. The vulnerability does not require complex attack vectors or user interaction, making it a significant availability risk for affected systems.",
"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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]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-37460"
},
{
"category": "external",
"summary": "RHBZ#2484385",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484385"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-37460",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-37460"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-37460",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-37460"
},
{
"category": "external",
"summary": "https://github.com/FRRouting/frr",
"url": "https://github.com/FRRouting/frr"
},
{
"category": "external",
"summary": "https://github.com/FRRouting/frr/commit/7676cad65114aa23adde58",
"url": "https://github.com/FRRouting/frr/commit/7676cad65114aa23adde58"
},
{
"category": "external",
"summary": "https://github.com/FRRouting/frr/pull/21098%2C",
"url": "https://github.com/FRRouting/frr/pull/21098%2C"
}
],
"release_date": "2026-06-03T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-08T03:17:56+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:24347"
},
{
"category": "workaround",
"details": "To mitigate this issue, restrict access to FRRouting\u0027s BGP services to only trusted peers and networks. Implement firewall rules to limit inbound connections to BGP port 179 (TCP) to known, legitimate BGP neighbors. If BGP is not actively used, consider disabling the BGP daemon within FRR to eliminate the attack surface. Warning: Modifying firewall rules or FRR configuration may impact network connectivity and requires careful planning and testing. A restart of the FRR service may be required for changes to take effect.",
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],
"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"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "frr: FRRouting: Denial of Service via crafted BGP UPDATE message"
}
]
}
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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.
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