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Rewterz Threat Advisory – CVE-2018-16871 – Linux Kernel “nfsd4_verify_copy()” Vulnerability

Severity

Medium

Analysis Summary

An error within the “nfsd4_verify_copy()” function (fs/nfsd/nfs4proc.c) can be exploited to trigger a NULL pointer deference and subsequently crash the NFS server.

Impact

Denial of Service

Affected Vendors

Linux

Affected Products

  • Linux Kernel 4.9.x
  • Linux Kernel 4.14.x
  • Linux Kernel 4.19.x

Remediation

Update to a fixed version.

Versions 4.19.x:

Update to version 4.19.3 or later.

Versions 4.14.x:

Update to version 4.14.82 or later.

Versions 4.9.x:

Update to version 4.9.138 or later.

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