{"id":"CVE-2025-0678","title":"A flaw was found in grub2","summary":"A flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs module uses user-controlled parameters from the filesystem geometry to determine the internal buffer size, however, it improperly checks for intege…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-190","CWE-190"],"vendor":"gnu","product":"grub2","affected":["grub2 <= 2.12","openshift_container_platform = 4.0","enterprise_linux = 7.0","enterprise_linux = 8.0","enterprise_linux = 9.0"],"published":"2025-03-03","updated":"2026-06-26","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-0678","references":[{"url":"https://access.redhat.com/security/cve/CVE-2025-0678","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2346118","label":"secalert@redhat.com"},{"url":"https://lists.gnu.org/archive/html/grub-devel/2025-02/msg00024.html","label":"secalert@redhat.com"}],"tags":["nvd"],"epss":0.00284,"epssPercentile":0.21177,"ingestedAt":"2026-06-26T16:43:13.410Z","slug":"CVE-2025-0678","body":"## Overview\n\nA flaw was found in grub2. When reading data from a squash4 filesystem, grub's squash4 fs 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 direct_read() will perform a heap based out-of-bounds write during data reading. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution, by-passing secure boot protections.\n\n## Affected\n\n- `grub2 <= 2.12`\n- `openshift_container_platform = 4.0`\n- `enterprise_linux = 7.0`\n- `enterprise_linux = 8.0`\n- `enterprise_linux = 9.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}