What is CVE-2018-1094?

CVE-2018-1094 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2018-04-02.

How severe is CVE-2018-1094?

Medium severity. CVSS v3 base score is 5.5 out of 10.

NULL pointer dereference in Linux Kernel

CVE-2018-1094

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.

Published 2018-04-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.021 (80.8th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 80.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: -0.000

Affected products

Linux Kernel
Canonical Ubuntu Linux — versions 16.04, 18.04
Red Hat Enterprise Linux Desktop — versions 7.0
Red Hat Enterprise Linux Server — versions 7.0
Red Hat Enterprise Linux Workstation — versions 7.0
Linux Kernel Through Version 4.15 — versions Linux kernel through version 4.15

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
access.redhat.com/errata/RHSA-2018:3083 (vendor-advisory, Third Party Advisory)
git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/ (Third Party Advisory)
openwall.com/lists/oss-security/2018/03/29/1 (Mailing List, Third Party Advisory)
usn.ubuntu.com/3695-1/ (vendor-advisory, Third Party Advisory)
git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git/commit/ (Patch)
usn.ubuntu.com/3695-2/ (vendor-advisory, Third Party Advisory)
bugzilla.kernel.org/show_bug.cgi (Exploit, Issue Tracking)
access.redhat.com/errata/RHSA-2018:2948 (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2018:3096 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2018-1094?: CVE-2018-1094 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2018-04-02.
How severe is CVE-2018-1094?: Medium severity. CVSS v3 base score is 5.5 out of 10.