CVE-2026-56117

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Attackers can connect to the control socket and send a privileged command such as -x, causing control_recvdata() to free the client object while the same READ+HANGUP event subsequently reaches control_hangup() with the stale pointer, resulting in a use-after-free condition exploitable in deployments using --disable-privsep or where privsep initialization has failed with the control socket operating in mode 0666."}, {"lang": "es", "value": "dhcpcd hasta la versi\u00f3n 10.3.2, corregido en el commit 78ea09e, contiene una vulnerabilidad de uso despu\u00e9s de liberaci\u00f3n (use-after-free) en el heap en el manejo del socket de control dentro de src/control.c que permite a atacantes locales sin privilegios desencadenar corrupci\u00f3n de memoria cuando la separaci\u00f3n de privilegios est\u00e1 deshabilitada. Los atacantes pueden conectarse al socket de control y enviar un comando privilegiado como -x, lo que provoca que control_recvdata() libere el objeto cliente mientras que el mismo evento READ+HANGUP llega posteriormente a control_hangup() con el puntero obsoleto, lo que resulta en una condici\u00f3n de uso despu\u00e9s de liberaci\u00f3n (use-after-free) explotable en implementaciones que utilizan --disable-privsep o donde la inicializaci\u00f3n de privsep ha fallado con el socket de control operando en modo 0666."}], "id": "CVE-2026-56117", "lastModified": "2026-10-25T23:10:00.167", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "disclosure@vulncheck.com", "type": "Secondary"}, {"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "disclosure@vulncheck.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-56117", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-06-24T13:43:04.591782Z", "version": "2.0.3"}}]}, "published": "2026-06-23T17:17:09.540", "references": [{"source": "disclosure@vulncheck.com", "tags": ["Patch"], "url": "https://github.com/NetworkConfiguration/dhcpcd/commit/78ea09ed1633a583dbcde6e7bab9df4639ec8a34"}, {"source": "disclosure@vulncheck.com", "tags": ["Third Party Advisory"], "url": "https://www.vulncheck.com/advisories/dhcpcd-heap-use-after-free-via-control-socket-handling"}], "sourceIdentifier": "disclosure@vulncheck.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "disclosure@vulncheck.com", "type": "Secondary"}]}

{"bugzilla": {"description": "dhcpcd: dhcpcd: Local heap use-after-free vulnerability leads to denial of service.", "id": "2491845", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2491845"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in dhcpcd. A heap use-after-free vulnerability in the control socket handling allows a local unprivileged attacker to trigger memory corruption. This occurs when privilege separation is disabled, enabling the attacker to send a privileged command to the control socket. Successful exploitation can lead to a denial of service."], "mitigation": {"lang": "en:us", "value": "Ensure that the `dhcpcd` service is configured to run with privilege separation enabled. If `dhcpcd` is running with privilege separation disabled (e.g., via `--disable-privsep`), re-enable it to prevent local unprivileged attackers from exploiting this vulnerability. If privilege separation cannot be enabled, restrict access to the system running `dhcpcd` or disable the `dhcpcd` service if it is not critical for network operations. If the `dhcpcd` service is reconfigured, a restart may be required for changes to take effect."}, "name": "CVE-2026-56117", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "dhcpcd", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-06-23T16:14:31Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-56117\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-56117\nhttps://github.com/NetworkConfiguration/dhcpcd/commit/78ea09ed1633a583dbcde6e7bab9df4639ec8a34\nhttps://www.vulncheck.com/advisories/dhcpcd-heap-use-after-free-via-control-socket-handling"], "threat_severity": "Moderate"}

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