CVE-2026-4892

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{"bugzilla": {"description": "dnsmasq: DHCPv6 CLID buffer overflow in helper process", "id": "2458518", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458518"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-122", "details": ["A heap buffer overflow was discovered in dnsmasq's DHCP script helper process. When processing DHCPv6 client identifiers (CLIDs), the helper hex-encodes the raw CLID bytes into a fixed-size buffer without length validation. Since DHCPv6 CLIDs can be up to 65,535 bytes, a crafted DHCPv6 packet can overflow the buffer with attacker-controlled content. The helper process runs with root privileges."], "name": "CVE-2026-4892", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "dnsmasq", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Will not fix", "package_name": "dnsmasq", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "dnsmasq", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "dnsmasq", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "dnsmasq", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-05-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4892\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4892"], "statement": "Red Hat rates this as Important. The overflow occurs in a root-privileged helper process with attacker-controlled content, and the `--dhcp-script` option is enabled by default in libvirt virtual network configurations, which affects RHEL systems using virt-manager, virt-install, or cockpit-machines. Exploitation requires the attacker to send crafted DHCPv6 packets from within the virtual network, meaning a malicious VM guest could potentially exploit this for host-level code execution as root.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "2.93"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "dnsmasq", "source": "cna", "vendor": "dnsmasq"}, "product": "dnsmasq", "vendor": "dnsmasq"}], "created": "2026-05-11T18:45:25.408425+00:00", "title": "Heap Out-of-Bounds Write in dnsmasq DHCPv6 Allows Root Privileges", "updated": "2026-05-11T20:45:26.031966+00:00", "vendors": ["dnsmasq", "dnsmasq$PRODUCT$dnsmasq"], "weaknesses": ["CWE-122"]}