An integer overflow flaw was found in the BFS file system driver in grub2. When reading a file with an indirect extent map, grub2 fails to validate the number of extent entries to be read. A crafted or corrupted BFS filesystem may cause an integer overflow during the file reading, leading to a heap of bounds read. As a consequence, sensitive data may be leaked, or grub2 will crash.
Exploitability
AV:LAC:LPR:HUI:NScope
S:UImpact
C:HI:NA:H6/CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:HOther