REDHAT-BUG-2346121: Integer Overflow

First published: Mon Feb 17 2025(Updated: )

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 buffers size, however it misses to properly check for integer overflows. A maliciously crafted filesystem may lead some of those buffer size calculation 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 a out-of-bounds writes when calling grub_disk_read() function. This flaw may be leveraged to corrupt grub's internal critical data and may result in arbitrary code execution by-passing secure boot protections.

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• collector/redhat-bugzilla
• source/Red Hat
• alias/CVE-2025-0686
• agent/weakness
• agent/severity
• agent/last-modified-date
• agent/type
• agent/source
• agent/references
• agent/description
• agent/first-publish-date
• agent/event
• agent/tags
• agent/softwarecombine
• agent/guess-ai
• agent/software-canonical-lookup
• vendor/gnu
• canonical/ubuntu grub (gnu grand unified bootloader)