CVE-2026-40223

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{"bugzilla": {"description": "systemd: systemd: Local unprivileged user can cause Denial of Service", "id": "2457318", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2457318"}, "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-617", "details": ["A flaw was found in systemd, a core component of Linux operating systems. A local user, without special privileges, can exploit this vulnerability. By manipulating a specific systemd unit configuration where delegation is enabled and the user is not set, the user can trigger an internal error, leading to a Denial of Service (DoS). This means the affected system may become unresponsive or crash, impacting its availability."], "name": "CVE-2026-40223", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "NetworkManager", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "rpm-ostree", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "NetworkManager", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "NetworkManager", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "systemd", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "systemd", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "NetworkManager", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "systemd", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-04-10T15:10:56Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-40223\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-40223\nhttps://github.com/systemd/systemd/security/advisories/GHSA-x4h8-rrrg-q78f"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[258,260)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "systemd", "source": "cna", "vendor": "systemd"}, "product": "systemd", "vendor": "systemd"}], "analysis": {"en": {"generated_at": "2026-04-13T13:23:29.561734+00:00", "value": {"mitigation_remediation": ["Upgrade systemd to version 260 or newer.", "Remove or modify any units that use Delegate=yes with an unset User.", "Restart systemd to apply the changes.", "Monitor systemd logs for assertion crash events."], "summary": {"action": "Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The affected product is systemd, version 258 and 259. Any system running those releases that has a unit configured with Delegate=yes and an unset User can be impacted. The issue does not affect later versions such as 260 or newer.", "description_and_impact": "The vulnerability allows a local unprivileged user to trigger an assertion in systemd 258 before 260 when a running unit contains Delegate=yes and User unset, causing systemd to crash and the system to become unavailable. This results in a denial\u2011of\u2011service condition for all services that rely on systemd.", "risk_and_exploitability": "CVSS score of 4.7 indicates a moderate severity, and the EPSS score is below 1\u202f%, meaning the likelihood of exploitation is very low. The vulnerability is not listed in CISA\u2019s KEV catalog. It requires local, unprivileged access and the presence of a specific unit configuration; an attacker would create or modify a unit with Delegate=yes and empty User to trigger the crash. No remote exploitation vector exists."}}}}, "created": "2026-04-13T12:44:51.917162+00:00", "updated": "2026-04-13T14:27:08.600352+00:00", "vendors": ["systemd", "systemd$PRODUCT$systemd"]}