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Graph/0002afb7-34a4-4e30-8348-47f50b77ccd9

Domainunvalidated

Font Rendering

0002afb7-34a4-4e30-8348-47f50b77ccd9

Font Rendering

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Updated5/2/2026

PageRank0.0000

Effectiveness0.000

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3 linked nodes

PERTAIN_TOReport

GRUB2 CVE-2022-2601 - Heap Overflow in PF2 Font Glyph Loading via Integer Overflow

PERTAIN_TOProblem

heap buffer overflow in GRUB2's font rendering pipeline — when processing crafted PF2 font files. Outcome: enabling arbitrary code execution in the bootloader.

PERTAIN_TOSolution

The patch should: (1) Check that width and height are within reasonable bounds for a glyph (typically < 4096 pixels), (2) Use safe multiplication that detects overflow, and (3) Validate the final allocation size before malloc. — The GRUB2 header files already include <grub/safemath.h> which provides grub_mul() and grub_add() for safe arithmetic. Tension: The vulnerability is in the core font loading path. Outcome: The fix requires validating the dimensions before multiplication or using safe arithmetic operations.

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