CVE-2018-1094: Canonical Ubuntu Linux

Medium severity, CVSS 5.5. EPSS: 2.1% chance of exploitation in the next 30 days.

The ext4_fill_super function in fs/ext4/super.c in the Linux kernel through 4.15.15 does not always initialize the crc32c checksum driver, which allows attackers to cause a denial of service (ext4_xattr_inode_hash NULL pointer dereference and system crash) via a crafted ext4 image.

Affected products

• Canonical Ubuntu Linux: version 16.04 only; version 18.04 only
• Linux Linux Kernel: up to and including 4.15.15
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server: version 7.0 only
• Red Hat Enterprise Linux Workstation: version 7.0 only

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