Grub2: net: out-of-bounds write in grub_net_search_config_file()

Summary

A flaw was found in grub2. During the network boot process, when trying to search for the configuration file, grub copies data from a user controlled environment variable into an internal buffer using the grub_strcpy() function. During this step, it fails to consider the environment variable length when allocating the internal buffer, resulting in an out-of-bounds write. If correctly exploited, this issue may result in remote code execution through the same network segment grub is searching for the boot information, which can be used to by-pass secure boot protections.

Timeline

1. Feb 19, 2025, 6:23 PM UTCCVE published
2. Sep 19, 2025, 3:55 AM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: total

3. Oct 13, 2026, 2:21 AM UTCRecord last updated

Affected versions

• grub2

  through 2.12

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• grub2

  Version range not reported

• openshift/ose-rhel-coreos-8

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• openshift/ose-rhel-coreos-9

  Version range not reported

• grub2

  Version range not reported

References 19