LiveActive security incident?Get immediate response
CVE Record

CVE-2018-1000028: Linux kernel version after commit bdcf0a423ea1 - 4.15-rc4+, 4.14.8+, 4.9.76+, 4.4.111+ contains a Incorrect...

Linux kernel version after commit bdcf0a423ea1 - 4.15-rc4+, 4.14.8+, 4.9.76+, 4.4.111+ contains a Incorrect Access Control vulnerability in NFS server (nfsd) that can result in remote users reading or writing files they should not be able to via NFS. This attack appear to be exploitable via NFS server must export a filesystem with the "rootsquash" options enabled. This vulnerability appears to have been fixed in after commit 1995266727fa.

UnknownCVSS not scoredNot KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This flaw affects Linux NFS servers in specific kernel ranges. If a vulnerable server exports a filesystem with rootsquash enabled, remote NFS users may read or write files they should not be allowed to access. Treat exposed NFS shares as potentially serious, especially where they contain sensitive or operational files.

Executive priority

Prioritize if NFS is used for sensitive data, shared application storage, or administrative workflows. Business risk comes from unauthorized remote file read or write through a trusted file-sharing service. Systems without nfsd or rootsquash exports are less likely to be exposed.

Technical view

CVE-2018-1000028 is an incorrect access control issue in Linux kernel nfsd introduced after commit bdcf0a423ea1 and affecting listed 4.15-rc4+, 4.14.8+, 4.9.76+, and 4.4.111+ ranges. The condition described requires an NFS export using rootsquash. The source states it was fixed after upstream commit 1995266727fa8143897e89b55f5d3c79aa828420.

Likely exposure

Exposure is most likely on Linux systems running the kernel NFS server and exporting filesystems with rootsquash enabled. The CVE data does not identify specific distributions, packages, or CPEs, so teams must map kernel builds and vendor backports locally.

Exploitation context

The source bundle does not report active exploitation, and the CVE is not flagged in KEV. The described attack context is remote NFS access to an exported filesystem with rootsquash enabled, potentially allowing unauthorized file reads or writes through NFS access control failure.

Researcher notes

Evidence is limited to the CVE description and upstream kernel fix reference. No CVSS, CWE, distro package list, CPEs, or public exploitation evidence is provided. Pay close attention to vendor backports because distribution kernel version strings may not directly match upstream ranges.

Mitigation direction

  • Apply vendor or kernel updates that include the referenced upstream fix.
  • Identify NFS exports using rootsquash and prioritize those servers for remediation.
  • Restrict NFS access to trusted networks and clients while remediation is pending.
  • Review vendor advisories for distribution-specific patched kernel versions.
  • Monitor sensitive NFS shares for unexpected file changes or access patterns.

Validation and detection

  • Inventory Linux hosts running nfsd and record kernel versions.
  • Review NFS export configuration for rootsquash-enabled filesystems.
  • Confirm installed kernels include the upstream fix or vendor backport.
  • Check vendor security advisories for distro-specific applicability.
  • Validate NFS permissions with authorized regression tests after patching.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2018-1000028 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.