CVE-2018-1093: Linux Kernel

Medium severity, CVSS 5.5. EPSS: 1.9% chance of exploitation in the next 30 days.

The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux kernel through 4.15.15 allows attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image because balloc.c and ialloc.c do not validate bitmap block numbers.

Affected products

• Linux Linux Kernel: up to and including 4.15.15

Published 2018-04-02. Last modified 2026-06-17.