{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-15816", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-07-15T11:41:57.564Z", "datePublished": "2026-08-07T10:33:33.612Z", "dateUpdated": "2026-08-07T10:33:33.612Z"}, "containers": {"cna": {"title": "Dracut: dracut: root code execution via unescaped error message written to sourced emergency hook script in die()", "metrics": [{"other": {"content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in dracut. The die() error-handling function writes its message into a shell script under the initramfs emergency-hook directory without properly shell-quoting it. When the message contains data derived from the DHCP ROOT_PATH option, an attacker on the adjacent network who controls a rogue DHCP server can inject a command-substitution sequence that executes as root the next time dracut sources its emergency hook scripts during standard boot-failure handling."}], "affected": [{"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "dracut", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:10"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 6", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "dracut", "defaultStatus": "unknown", "cpes": ["cpe:/o:redhat:enterprise_linux:6"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "dracut", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:7"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 8", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "dracut", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:8"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 9", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "dracut", "defaultStatus": "affected", "cpes": ["cpe:/o:redhat:enterprise_linux:9"]}, {"vendor": "Red Hat", "product": "Red Hat Hardened Images", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "dracut", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:hummingbird:1"]}, {"vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "rhcos", "defaultStatus": "affected", "cpes": ["cpe:/a:redhat:openshift:4"]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-15816", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459963"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500889", "name": "RHBZ#2500889", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://github.com/dracutdevs/dracut/blob/master/modules.d/40network/netroot.sh"}, {"url": "https://github.com/dracutdevs/dracut/blob/master/modules.d/99base/dracut-lib.sh"}], "datePublic": "2026-08-05T23:59:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-78", "description": "Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')", "workarounds": [{"lang": "en", "value": "Restrict DHCP server access on networks used for network boot (DHCP snooping, dedicated/trusted provisioning VLANs) until a fix is available."}], "timeline": [{"lang": "en", "time": "2026-06-10T19:21:21.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-08-05T23:59:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "This issue was discovered by Pavel Valena (Red Hat)."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-08-07T10:33:33.612Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}}}

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{"acknowledgement": "This issue was discovered by Pavel Valena (Red Hat).", "bugzilla": {"description": "dracut: dracut: root code execution via unescaped error message written to sourced emergency hook script in die()", "id": "2500889", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2500889"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-78", "details": ["A flaw was found in dracut. The die() error-handling function writes its message into a shell script under the initramfs emergency-hook directory without properly shell-quoting it. When the message contains data derived from the DHCP ROOT_PATH option, an attacker on the adjacent network who controls a rogue DHCP server can inject a command-substitution sequence that executes as root the next time dracut sources its emergency hook scripts during standard boot-failure handling."], "mitigation": {"lang": "en:us", "value": "Restrict DHCP server access on networks used for network boot (DHCP snooping, dedicated/trusted provisioning VLANs) until a fix is available."}, "name": "CVE-2026-15816", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "dracut", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "dracut", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "dracut", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "dracut", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "dracut", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "dracut", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-05T23:59:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-15816\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-15816\nhttps://bugzilla.redhat.com/show_bug.cgi?id=2459963\nhttps://github.com/dracutdevs/dracut/blob/master/modules.d/40network/netroot.sh\nhttps://github.com/dracutdevs/dracut/blob/master/modules.d/99base/dracut-lib.sh"], "statement": "Red Hat Product Security rates this flaw's impact as Important. Exploitation requires an attacker-controlled or spoofed DHCP server on the same network segment as a system performing network boot (root=dhcp/netroot=dhcp), and for the DHCP-supplied ROOT_PATH value to fail dracut's netroot handler resolution -- both fully within an adjacent-network attacker's control. Reaching the point where the poisoned hook script is actually sourced depends on dracut's boot-failure handling reinvoking the emergency shell mechanism, which occurs by default when the netroot handler cannot be resolved. This is a separate code path from CVE-2026-6893, which patched modules.d/35network-legacy/dhclient-script.sh but did not modify dracut-lib.sh's die() function. Systems that do not perform network/PXE boot, or that do not rely on DHCP-supplied ROOT_PATH values, are not exposed to this issue.", "threat_severity": "Important"}

{"created": "2026-08-07T12:30:05.021909+00:00", "updated": "2026-08-07T12:30:05.021924+00:00", "vendors": []}