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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": []}