CVE-2026-15816

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 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 Software

VendorProductVersion RangeStatus
Red HatRed Hat Enterprise Linux 100:107-9.el10_2 < *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:105-4.el10_0.1 < *unaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support0:033-577.el7_9 < *unaffected
Red HatRed Hat Enterprise Linux 80:049-246.git20260728.el8_10 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:049-138.git20220131.el8_4.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On0:049-138.git20220131.el8_4.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:049-203.git20220511.el8_6.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On0:049-203.git20220511.el8_6.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:049-223.git20230119.el8_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:049-223.git20230119.el8_8.1 < *unaffected
Red HatRed Hat Enterprise Linux 90:057-120.git20260728.el9_8 < *unaffected
Red HatRed Hat Enterprise Linux 90:057-120.git20260728.el9_8 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions0:057-25.git20250717.el9_2.2 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions0:057-54.git20250423.el9_4.3 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:057-89.git20250311.el9_6.1 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.13413.92.202609080414-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.14414.92.202609011250-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.16416.94.202609011112-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.18418.94.202609031320-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.194.19.9.6.202609021231-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.204.20.9.6.202608260604-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.214.21.9.6.202609021100-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.224.22.9.8.202608251819-0 < *unaffected
Red HatRed Hat OpenShift Container Platform 4.224.22.9.8.202609081748-0 < *unaffected

Weaknesses

  • CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Workarounds

Restrict DHCP server access on networks used for network boot (DHCP snooping, dedicated/trusted provisioning VLANs) until a fix is available.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References