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Out-of-bounds Write


Severity High
Score 8.6/10


A buffer overflow was found in "grub_font_construct_glyph()" in grub2. A malicious crafted pf2 font can lead to an overflow when calculating the "max_glyph_size" value, allocating a smaller than-needed buffer for the "glyph". This further leads to a buffer overflow and a heap-based out-of-bounds write. An attacker may use this vulnerability to circumvent the secure boot mechanism.

  • LOW
  • HIGH
  • NONE
  • HIGH
  • HIGH

CWE-787 - Out-of-Bounds Write

Out-of-bounds write vulnerability is a memory access bug that allows software to write data past the end or before the beginning of the intended buffer. This may result in the corruption of data, a crash, or arbitrary code execution.

Advisory Timeline

  • Published