{"id":"CVE-2025-0686","details":"A flaw was found in grub2. When performing a symlink lookup from a romfs filesystem, grub's romfs filesystem module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for integer overflows. A maliciously crafted filesystem may lead some of those buffer size calculations to overflow, causing it to perform a grub_malloc() operation with a smaller size than expected. As a result, the grub_romfs_read_symlink() may cause out-of-bounds writes when the calling grub_disk_read() function. This issue may be leveraged to corrupt grub's internal critical data and can result in arbitrary code execution by-passing secure boot protections.","modified":"2026-04-10T05:20:20.275188Z","published":"2025-03-03T18:15:30.930Z","related":["SUSE-SU-2025:01961-1","SUSE-SU-2025:0586-1","SUSE-SU-2025:0587-1","SUSE-SU-2025:0588-1","SUSE-SU-2025:0607-1","SUSE-SU-2025:0629-1","SUSE-SU-2025:20511-1","SUSE-SU-2025:20863-1","openSUSE-SU-2025:14822-1"],"references":[{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2025-0686"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2346121"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"0"},{"last_affected":"2.12"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-0686.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"}]}