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Vulnerability record · CVE-2018-16871 · published 30 July 2019

CVE-2018-16871: Linux kernel null pointer dereference vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 2.7% · top 14.6% CWE-476 · NULL pointer dereference
7.5CVSS 3.1 base score, v2 5.0
2.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
20Affected product versions listed by NVD
14References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

20 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2019:2696 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2730 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0740 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16871 Issue TrackingThird Party Advisory
https://security.netapp.com/advisory/ntap-20211004-0002/ Third Party Advisory
https://support.f5.com/csp/article/K18657134 Third Party Advisory
https://support.f5.com/csp/article/K18657134?utm_source=f5support&amp%3Butm_medium=RSS
https://access.redhat.com/errata/RHSA-2019:2696 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2730 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0740 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16871 Issue TrackingThird Party Advisory
https://security.netapp.com/advisory/ntap-20211004-0002/ Third Party Advisory
https://support.f5.com/csp/article/K18657134 Third Party Advisory
https://support.f5.com/csp/article/K18657134?utm_source=f5support&amp%3Butm_medium=RSS

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Source: NIST National Vulnerability Database (record CVE-2018-16871), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.