high 7.5

CVE-2018-16871 json

A flaw was found in the Linux kernel's NFS implementation, all versions 3.x and all versions 4.x up to 4.20.

published 2019-07-30 7y ago modified 2026-06-17 4mo ago also EUVD-2018-8662

cvss: 7.5; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.7%; EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits: 0; none known

A flaw was found in the Linux kernel's NFS implementation, all versions 3.x and all versions 4.x up to 4.20. An attacker, who is able to mount an exported NFS filesystem, is able to trigger a null pointer dereference by using an invalid NFS sequence. This can panic the machine and deny access to the NFS server. Any outstanding disk writes to the NFS server will be lost.

Patch / fix

distros 5

debian ubuntu red hat suse opensuse

linux Debian 14, Debian 13, Debian 12 4.18.20-1

debian advisories DEBIAN-CVE-2018-16871

linux Ubuntu 18.04 LTS 4.15.0-46.49
linux-aws Ubuntu 18.04 LTS 4.15.0-1033.35
linux-gcp Ubuntu 16.04 LTS 4.15.0-1028.29~16.04.1
linux-gcp Ubuntu 18.04 LTS 4.15.0-1028.29
linux-hwe Ubuntu 16.04 LTS 4.15.0-46.49~16.04.1
linux-hwe Ubuntu 18.04 LTS 4.18.0-14.15~18.04.1
linux-kvm Ubuntu 18.04 LTS 4.15.0-1030.30
linux-oem Ubuntu 18.04 LTS 4.15.0-1034.39

ubuntu advisories UBUNTU-CVE-2018-16871

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

kernel-alt RHEL 7 4.14.0-115.18.1.el7a
perf RHEL 7 4.14.0-115.18.1.el7a
kernel RHEL 7 4.14.0-115.18.1.el7a
python-perf RHEL 7 4.14.0-115.18.1.el7a
kernel-tools RHEL 7 4.14.0-115.18.1.el7a
kernel-tools-libs RHEL 7 4.14.0-115.18.1.el7a
kernel-bootwrapper RHEL 7 4.14.0-115.18.1.el7a
kernel-abi-whitelists RHEL 7 4.14.0-115.18.1.el7a

red hat advisories RHSA-2020:0740 RHSA-2020:1567 RHSA-2020:1769 RHSA-2019:2730 RHSA-2019:2696 RHSA-2019:1891

kernel-rt SLE Real Time 12 SP4 4.12.14-8.3.1
kernel-syms-rt SLE Real Time 12 SP4 4.12.14-8.3.1
kernel-rt_debug SLE Real Time 12 SP4 4.12.14-8.3.1
kernel-source-rt SLE Real Time 12 SP4 4.12.14-8.3.1
kernel-source-rt Real Time Module 15 SP1 4.12.14-14.8.1
kernel-rt Real Time Module 15 SP1 4.12.14-14.8.1
kernel-syms-rt Real Time Module 15 SP1 4.12.14-14.8.1
kernel-rt_debug Real Time Module 15 SP1 4.12.14-14.8.1

suse advisories SUSE-SU-2019:3252-1 SUSE-SU-2019:3246-1 SUSE-SU-2019:3223-1 SUSE-SU-2019:2450-1 SUSE-SU-2019:2430-1 SUSE-SU-2019:2069-1

kernel-syms openSUSE Leap 15.1 4.12.14-lp151.28.10.1
kernel-obs-qa openSUSE Leap 15.1 4.12.14-lp151.28.10.1
kernel-source openSUSE Leap 15.1 4.12.14-lp151.28.10.1
kernel-default openSUSE Leap 15.1 4.12.14-lp151.28.10.1
kernel-vanilla openSUSE Leap 15.1 4.12.14-lp151.28.10.1
kernel-kvmsmall openSUSE Leap 15.1 4.12.14-lp151.28.10.1
kernel-obs-build openSUSE Leap 15.1 4.12.14-lp151.28.10.1
kernel-syms openSUSE Leap 15.0 4.12.14-lp150.12.67.1

opensuse advisories openSUSE-SU-2019:1757-1 openSUSE-SU-2019:1716-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16871 updated 2026-11-05 cvss 7.5

kernel: nfs: NULL pointer dereference due to an anomalized NFS message sequence

Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-193.el8, kernel-debuginfo-common-aarch64 4.18.0-193.el8, kernel-debuginfo-common-ppc64le 4.18.0-193.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-193.el8, kernel 4.18.0-193.el8, bpftool 4.18.0-193.el8, kernel-core 4.18.0-193.el8, kernel-tools 4.18.0-193.el8, python3-perf 4.18.0-193.el8, +15 more
fixed: vendor fix RHSA-2020:1769
Red Hat Enterprise Linux Client (v. 7) perf 3.10.0-957.27.2.el7, kernel 3.10.0-957.27.2.el7, bpftool 3.10.0-957.27.2.el7, python-perf 3.10.0-957.27.2.el7, kernel-tools 3.10.0-957.27.2.el7, kernel-tools-libs 3.10.0-957.27.2.el7, +2 more Red Hat Enterprise Linux Client Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-957.27.2.el7 Red Hat Enterprise Linux ComputeNode (v. 7) perf 3.10.0-957.27.2.el7, kernel 3.10.0-957.27.2.el7, bpftool 3.10.0-957.27.2.el7, python-perf 3.10.0-957.27.2.el7, kernel-tools 3.10.0-957.27.2.el7, kernel-tools-libs 3.10.0-957.27.2.el7, +2 more
fixed: vendor fix RHSA-2019:1873
Red Hat Enterprise Linux ComputeNode EUS (v. 7.4) perf 3.10.0-693.58.1.el7, kernel 3.10.0-693.58.1.el7, python-perf 3.10.0-693.58.1.el7, kernel-tools 3.10.0-693.58.1.el7, kernel-tools-libs 3.10.0-693.58.1.el7, kernel-abi-whitelists 3.10.0-693.58.1.el7, +1 more
fixed: vendor fix RHSA-2019:2696
Red Hat Enterprise Linux ComputeNode Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-957.27.2.el7
fixed: vendor fix RHSA-2019:1873
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.4) kernel-debuginfo-common-x86_64 3.10.0-693.58.1.el7
fixed: vendor fix RHSA-2019:2696
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) perf 4.14.0-115.18.1.el7a, kernel 4.14.0-115.18.1.el7a, kernel-alt 4.14.0-115.18.1.el7a, python-perf 4.14.0-115.18.1.el7a, kernel-tools 4.14.0-115.18.1.el7a, kernel-tools-libs 4.14.0-115.18.1.el7a, +3 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) kernel-debuginfo-common-ppc64le 4.14.0-115.18.1.el7a
fixed: vendor fix RHSA-2020:0740
Red Hat Enterprise Linux for Real Time for NFV (v. 7) kernel-rt 3.10.0-957.27.2.rt56.940.el7, kernel-rt-kvm 3.10.0-957.27.2.rt56.940.el7, kernel-rt-trace 3.10.0-957.27.2.rt56.940.el7, kernel-rt-debug-kvm 3.10.0-957.27.2.rt56.940.el7, kernel-rt-trace-kvm 3.10.0-957.27.2.rt56.940.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-957.27.2.rt56.940.el7
fixed: vendor fix RHSA-2019:1891
Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-193.rt13.51.el8, kernel-rt-core 4.18.0-193.rt13.51.el8, kernel-rt-modules 4.18.0-193.rt13.51.el8, kernel-rt-debug-core 4.18.0-193.rt13.51.el8, kernel-rt-debug-modules 4.18.0-193.rt13.51.el8, kernel-rt-modules-extra 4.18.0-193.rt13.51.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-193.rt13.51.el8, kernel-rt-kvm 4.18.0-193.rt13.51.el8, kernel-rt-core 4.18.0-193.rt13.51.el8, kernel-rt-modules 4.18.0-193.rt13.51.el8, kernel-rt-debug-kvm 4.18.0-193.rt13.51.el8, kernel-rt-debug-core 4.18.0-193.rt13.51.el8, +4 more
fixed: vendor fix RHSA-2020:1567

show 8 more

Red Hat Enterprise Linux Realtime (v. 7) kernel-rt 3.10.0-957.27.2.rt56.940.el7, kernel-rt-trace 3.10.0-957.27.2.rt56.940.el7, kernel-rt-debuginfo-common-x86_64 3.10.0-957.27.2.rt56.940.el7
fixed: vendor fix RHSA-2019:1891
Red Hat Enterprise Linux Server (v. 7) perf 3.10.0-957.27.2.el7, kernel 3.10.0-957.27.2.el7, bpftool 3.10.0-957.27.2.el7, python-perf 3.10.0-957.27.2.el7, kernel-kdump 3.10.0-957.27.2.el7, kernel-tools 3.10.0-957.27.2.el7, +7 more
fixed: vendor fix RHSA-2019:1873
Red Hat Enterprise Linux Server EUS (v. 7.4) perf 3.10.0-693.58.1.el7, kernel 3.10.0-693.58.1.el7, python-perf 3.10.0-693.58.1.el7, kernel-kdump 3.10.0-693.58.1.el7, kernel-tools 3.10.0-693.58.1.el7, kernel-tools-libs 3.10.0-693.58.1.el7, +6 more
fixed: vendor fix RHSA-2019:2696
Red Hat Enterprise Linux Server Optional (v. 7) kernel-debuginfo-common-ppc64 3.10.0-957.27.2.el7, kernel-debuginfo-common-x86_64 3.10.0-957.27.2.el7, kernel-debuginfo-common-ppc64le 3.10.0-957.27.2.el7
fixed: vendor fix RHSA-2019:1873
Red Hat Enterprise Linux Server Optional EUS (v. 7.4) kernel-debuginfo-common-ppc64 3.10.0-693.58.1.el7, kernel-debuginfo-common-x86_64 3.10.0-693.58.1.el7, kernel-debuginfo-common-ppc64le 3.10.0-693.58.1.el7
fixed: vendor fix RHSA-2019:2696
Red Hat Enterprise Linux Workstation (v. 7) perf 3.10.0-957.27.2.el7, kernel 3.10.0-957.27.2.el7, bpftool 3.10.0-957.27.2.el7, python-perf 3.10.0-957.27.2.el7, kernel-tools 3.10.0-957.27.2.el7, kernel-tools-libs 3.10.0-957.27.2.el7, +2 more Red Hat Enterprise Linux Workstation Optional (v. 7) kernel-debuginfo-common-x86_64 3.10.0-957.27.2.el7
fixed: vendor fix RHSA-2019:1873
Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 3.10.0-693.58.1.rt56.652.el6rt, kernel-rt-trace 3.10.0-693.58.1.rt56.652.el6rt, kernel-rt-vanilla 3.10.0-693.58.1.rt56.652.el6rt, kernel-rt-firmware 3.10.0-693.58.1.rt56.652.el6rt, kernel-rt-debuginfo-common-x86_64 3.10.0-693.58.1.rt56.652.el6rt
fixed: vendor fix RHSA-2019:2730
Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.70% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.0	7.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

Red Hat kernel:

Classification

Weakness

CWE-476 NULL Pointer Dereference

Technology feeds

Linux kernel rss critical rss

References

access.redhat.com /errata/RHSA-2019:2696
vendor-advisory, third-party-advisory
access.redhat.com /errata/RHSA-2019:2730
vendor-advisory, third-party-advisory
access.redhat.com /errata/RHSA-2020:0740
vendor-advisory, third-party-advisory
bugzilla.redhat.com /show_bug.cgi?id=CVE-2018-16871
issue-tracking, third-party-advisory
support.f5.com /csp/article/K18657134
third-party-advisory
support.f5.com /csp/article/K18657134?utm_source=f5support&amp%3Butm_medium=RSS
security.netapp.com /advisory/ntap-20211004-0002/
third-party-advisory

Sources

CVE List CVE-2018-16871
NVD CVE-2018-16871

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

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