{
  "threat_severity" : "Important",
  "public_date" : "2026-08-05T23:59:00Z",
  "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"
  },
  "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" : "verified"
  },
  "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.", "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." ],
  "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.",
  "acknowledgement" : "This issue was discovered by Pavel Valena (Red Hat).",
  "affected_release" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "release_date" : "2026-08-13T00:00:00Z",
    "advisory" : "RHSA-2026:54576",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10.2",
    "package" : "dracut-0:107-9.el10_2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 10.0 Extended Update Support",
    "release_date" : "2026-08-20T00:00:00Z",
    "advisory" : "RHSA-2026:57580",
    "cpe" : "cpe:/o:redhat:enterprise_linux_eus:10.0",
    "package" : "dracut-0:105-4.el10_0.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
    "release_date" : "2026-09-01T00:00:00Z",
    "advisory" : "RHSA-2026:62269",
    "cpe" : "cpe:/o:redhat:rhel_els:7",
    "package" : "dracut-0:033-577.el7_9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "release_date" : "2026-08-13T00:00:00Z",
    "advisory" : "RHSA-2026:54575",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8",
    "package" : "dracut-0:049-246.git20260728.el8_10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
    "release_date" : "2026-08-31T00:00:00Z",
    "advisory" : "RHSA-2026:61252",
    "cpe" : "cpe:/o:redhat:rhel_tus:8.8",
    "package" : "dracut-0:049-223.git20230119.el8_8.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
    "release_date" : "2026-08-31T00:00:00Z",
    "advisory" : "RHSA-2026:61252",
    "cpe" : "cpe:/o:redhat:rhel_e4s:8.8",
    "package" : "dracut-0:049-223.git20230119.el8_8.1"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-08-13T00:00:00Z",
    "advisory" : "RHSA-2026:54571",
    "cpe" : "cpe:/a:redhat:enterprise_linux:9",
    "package" : "dracut-0:057-120.git20260728.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "release_date" : "2026-08-13T00:00:00Z",
    "advisory" : "RHSA-2026:54571",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9",
    "package" : "dracut-0:057-120.git20260728.el9_8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions",
    "release_date" : "2026-08-20T00:00:00Z",
    "advisory" : "RHSA-2026:57775",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.2",
    "package" : "dracut-0:057-25.git20250717.el9_2.2"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions",
    "release_date" : "2026-08-20T00:00:00Z",
    "advisory" : "RHSA-2026:57785",
    "cpe" : "cpe:/a:redhat:rhel_e4s:9.4",
    "package" : "dracut-0:057-54.git20250423.el9_4.3"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9.6 Extended Update Support",
    "release_date" : "2026-08-20T00:00:00Z",
    "advisory" : "RHSA-2026:57772",
    "cpe" : "cpe:/a:redhat:rhel_eus:9.6",
    "package" : "dracut-0:057-89.git20250311.el9_6.1"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4.20",
    "release_date" : "2026-09-01T00:00:00Z",
    "advisory" : "RHSA-2026:60445",
    "cpe" : "cpe:/a:redhat:openshift:4.20::el9",
    "package" : "rhcos-4.20.9.6.202608260604-0"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4.21",
    "release_date" : "2026-09-08T00:00:00Z",
    "advisory" : "RHSA-2026:63041",
    "cpe" : "cpe:/a:redhat:openshift:4.21::el9",
    "package" : "rhcos-4.21.9.6.202609021100-0"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4.22",
    "release_date" : "2026-09-01T00:00:00Z",
    "advisory" : "RHSA-2026:60440",
    "cpe" : "cpe:/a:redhat:openshift:4.22::el9",
    "package" : "rhcos-4.22.9.8.202608251819-0"
  } ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Out of support scope",
    "package_name" : "dracut",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Hardened Images",
    "fix_state" : "Not affected",
    "package_name" : "dracut",
    "cpe" : "cpe:/a:redhat:hummingbird:1"
  }, {
    "product_name" : "Red Hat OpenShift Container Platform 4",
    "fix_state" : "Affected",
    "package_name" : "openshift/ose-rhel-coreos-9",
    "cpe" : "cpe:/a:redhat:openshift:4"
  } ],
  "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" ],
  "name" : "CVE-2026-15816",
  "mitigation" : {
    "value" : "Restrict DHCP server access on networks used for network boot (DHCP snooping, dedicated/trusted provisioning VLANs) until a fix is available.",
    "lang" : "en:us"
  },
  "csaw" : false
}