What is CVE-2018-1095?

CVE-2018-1095 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-2018-1095?

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

NULL pointer dereference in Linux Kernel

CVE-2018-1095

The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl 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:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.014 (72.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.014 · change: -0.000

Affected products

Linux Kernel
Linux Kernel Through Version 4.15 — versions Linux kernel through version 4.15

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

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

Frequently asked questions

What is CVE-2018-1095?: CVE-2018-1095 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-2018-1095?: Medium severity. CVSS v3 base score is 5.5 out of 10.