--- id: CVE-2026-15816 title: A flaw was found in dracut summary: >- 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 ROO… severity: high cvss: 7.5 cvssVector: 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H' cwe: - CWE-78 vendor: Red Hat product: dracut affected: - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - dracut (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - rhcos (all versions) - dracut - dracut - openshift/ose-rhel-coreos-9 (all versions) patched: - enterprise_linux_server_v_7_els - openshift_container_platform 4.20 - openshift_container_platform 4.21 - openshift_container_platform 4.22 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_9 - enterprise_linux_baseos_eus_v_10_0 - enterprise_linux_baseos_v_10 - enterprise_linux_baseos_v_8 - enterprise_linux_baseos_e4s_v_8_8 - enterprise_linux_baseos_tus_v_8_8 - enterprise_linux_baseos_e4s_v_9_2 - enterprise_linux_baseos_e4s_v_9_4 - enterprise_linux_baseos_eus_v_9_6 - enterprise_linux_baseos_v_9 published: '2026-08-07' updated: '2026-09-21' sourceUpdated: '2026-09-21T04:17:06.867' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15816' references: - url: 'https://access.redhat.com/errata/RHSA-2026:54571' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:54575' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:54576' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:57580' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:57772' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:57775' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:57785' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:60440' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:60445' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:61252' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:62269' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:62409' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:62549' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:63041' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:63044' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:65839' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:65851' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:66357' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69118' label: secalert@redhat.com - url: 'https://access.redhat.com/errata/RHSA-2026:69119' label: secalert@redhat.com - url: 'https://access.redhat.com/security/cve/CVE-2026-15816' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2459963' label: secalert@redhat.com - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2500889' label: secalert@redhat.com - url: >- https://github.com/dracutdevs/dracut/blob/master/modules.d/40network/netroot.sh label: secalert@redhat.com - url: >- https://github.com/dracutdevs/dracut/blob/master/modules.d/99base/dracut-lib.sh label: secalert@redhat.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-15816.json - url: 'https://www.cve.org/CVERecord?id=CVE-2026-15816' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-15816' tags: - nvd - cve.org - csaf - vex - red-hat ssvc: exploitation: none automatable: 'no' technicalImpact: total timestamp: '2026-08-07T14:32:54.964951Z' epss: 0.00371 epssPercentile: 0.28229 ingestedAt: '2026-08-24T13:03:32.601Z' --- ## Overview 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. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:62269** · Red Hat · fixed in: Red Hat Enterprise Linux Server (v. 7 ELS) · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:62269) - **RHSA-2026:60445** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.20 · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:60445) - **RHSA-2026:63041** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.21 · released 2026-09-08 · [advisory](https://access.redhat.com/errata/RHSA-2026:63041) - **RHSA-2026:60440** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-09-01 · [advisory](https://access.redhat.com/errata/RHSA-2026:60440) - **RHSA-2026:54576** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54576) - **RHSA-2026:54571** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9) · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54571) - **RHSA-2026:57580** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS EUS (v. 10.0) · released 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:57580) - **RHSA-2026:54575** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8) · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54575) - **RHSA-2026:61252** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS E4S (v.8.8), Red Hat Enterprise Linux BaseOS TUS (v.8.8) · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61252) - **RHSA-2026:57775** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS E4S (v.9.2) · released 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:57775) - **RHSA-2026:57785** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS E4S (v.9.4) · released 2026-08-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:57785) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat OpenShift Container Platform 4 · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-15816.json) - **RHSA-2026:63044** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.19 · released 2026-09-09 · [advisory](https://access.redhat.com/errata/RHSA-2026:63044) - **RHSA-2026:62549** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.16 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:62549) - **RHSA-2026:62409** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.14 · released 2026-09-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:62409) - **RHSA-2026:66357** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.22 · released 2026-09-15 · [advisory](https://access.redhat.com/errata/RHSA-2026:66357) - **RHSA-2026:65851** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.18 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:65851) - **RHSA-2026:65839** · Red Hat · fixed in: Red Hat OpenShift Container Platform 4.13 · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:65839)