CVE-2026-36499

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "A missing upper-bound check in the udpif_set_threads() function of Open vSwitch v3.6.90 allows an attacker with OVSDB write access to request an excessive number of handler or revalidation threads. This can cause a denial of service (DoS) via resource exhaustion."}, {"lang": "es", "value": "Una comprobaci\u00f3n de l\u00edmite superior faltante en la funci\u00f3n udpif_set_threads() de Open vSwitch v3.6.90 permite a un atacante con acceso de escritura a OVSDB solicitar un n\u00famero excesivo de hilos gestores o de revalidaci\u00f3n. Esto puede causar una denegaci\u00f3n de servicio (DoS) por agotamiento de recursos."}], "id": "CVE-2026-36499", "lastModified": "2026-07-22T20:10:00.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-36499", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-04T18:42:14.770294Z", "version": "2.0.3"}}]}, "published": "2026-06-04T19:16:28.563", "references": [{"source": "cve@mitre.org", "url": "https://github.com/majdlatah/OVS-Other-Config-Bug"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/majdlatah/OVS-Other-Config-Bug"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "openvswitch: Open vSwitch: Denial of service via resource exhaustion due to missing upper-bound check", "id": "2484881", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2484881"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in Open vSwitch. A missing upper-bound check in udpif_set_threads() allows an attacker with OVSDB write access to request an excessive number of handler or revalidation threads, causing resource exhaustion and denial of service. Reported against Open vSwitch v3.6.90; affects deployments where OVSDB is writable by untrusted parties."], "mitigation": {"lang": "en:us", "value": "Restrict OVSDB write access to trusted administrators only. Do not expose OVSDB management interfaces to untrusted networks."}, "name": "CVE-2026-36499", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.5", "product_name": "Fast Datapath for RHEL 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.6", "product_name": "Fast Datapath for RHEL 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch", "product_name": "Fast Datapath for RHEL 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.10", "product_name": "Fast Datapath for RHEL 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.11", "product_name": "Fast Datapath for RHEL 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.12", "product_name": "Fast Datapath for RHEL 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.13", "product_name": "Fast Datapath for RHEL 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.11", "product_name": "Fast Datapath for RHEL 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.12", "product_name": "Fast Datapath for RHEL 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.13", "product_name": "Fast Datapath for RHEL 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.15", "product_name": "Fast Datapath for RHEL 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.16", "product_name": "Fast Datapath for RHEL 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.17", "product_name": "Fast Datapath for RHEL 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.1", "product_name": "Fast Datapath for RHEL 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch2.17", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.0", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.1", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.2", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.3", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.4", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.5", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9::fastdatapath", "fix_state": "Under investigation", "package_name": "openvswitch3.6", "product_name": "Fast Datapath for RHEL 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Under investigation", "package_name": "openvswitch", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Under investigation", "package_name": "openvswitch2.17", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Under investigation", "package_name": "openvswitch3.0", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Under investigation", "package_name": "openvswitch3.1", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-06-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-36499\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-36499\nhttp://open.com\nhttps://github.com/majdlatah/OVS-Other-Config-Bug"], "statement": "Open vSwitch is vulnerable to denial of service via resource exhaustion in udpif_set_threads() due to a missing upper-bound check on thread counts. An attacker with high privileges (OVSDB write access) can configure excessive handler or revalidation threads to exhaust system resources. CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H (4.4). Affects FDP, OpenShift OVS RPMs, RHEL-7 ELS, and Fedora openvswitch packages.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "3.6.90"}}], "enrichment": {"confidence": 100.0, "confidence_source": "manual", "scores": [{"score": 100.0, "source": "manual"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "openvswitch", "vendor": "redhat"}], "created": "2026-06-04T19:30:21.820935+00:00", "title": "Open vSwitch Thread Allocation Exploit Causing Denial of Service", "updated": "2026-06-05T10:10:59.353796+00:00", "vendors": ["redhat", "redhat$PRODUCT$openvswitch"]}