What is CVE-2018-1066?

CVE-2018-1066 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2018-03-02.

How severe is CVE-2018-1066?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Linux Kernel

CVE-2018-1066

The Linux kernel before version 4.11 is vulnerable to a NULL pointer dereference in fs/cifs/cifsencrypt.c:setup_ntlmv2_rsp() that allows an attacker controlling a CIFS server to kernel panic a client that has this server mounted, because an empty TargetInfo field in an NTLMSSP setup negotiation response is mishandled during session recovery.

Published 2018-03-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.034 (88.6th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 88.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.034 · newest: 0.034 · change: 0.000

Affected products

Linux Kernel
Canonical Ubuntu Linux — versions 12.04, 14.04
Debian Linux — versions 8.0, 9.0
Linux Kernel 4.11 — versions Linux kernel 4.11

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

lists.debian.org/debian-lts-announce/2018/07/msg00015.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2018/dsa-4187 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2018/07/msg00016.html (mailing-list, Mailing List, Third Party Advisory)
github.com/torvalds/linux/commit/cabfb3680f78981d26c078a26e5c748531257ebb (Patch, Third Party Advisory)
www.debian.org/security/2018/dsa-4188 (vendor-advisory, Third Party Advisory)
usn.ubuntu.com/3880-1/ (vendor-advisory, Third Party Advisory)
bugzilla.redhat.com/show_bug.cgi (Third Party Advisory, Issue Tracking)
usn.ubuntu.com/3880-2/ (vendor-advisory, Third Party Advisory)
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Vendor Advisory)
patchwork.kernel.org/patch/10187633/ (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2018-1066?: CVE-2018-1066 is a medium-severity vulnerability in Linux Kernel, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2018-03-02.
How severe is CVE-2018-1066?: Medium severity. CVSS v3 base score is 6.5 out of 10.