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CVE-2018-1120· NVD / CVE Program· CNA redhat

A flaw was found affecting the Linux kernel before version 4.17.

A flaw was found affecting the Linux kernel before version 4.17. By mmap()ing a FUSE-backed file onto a process's memory containing command line arguments (or environment strings), an attacker can cause utilities from psutils or procps (such as ps, w) or any other program which makes a read() call to the /proc/<pid>/cmdline (or /proc/<pid>/environ) files to block indefinitely (denial of service) or for some controlled time (as a synchronization primitive for other attacks).

MediumCVSS 5.3 · v3.0—Proof of concept Fix available
Published
Jun 20, 2018
Updated
Jun 16, 2026
EPSS
7.2% · 94th percentile
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Action score

23

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
2 / 30 · 7.2%

CNA vs NVD score

NVD
5.3
CNA · redhat
2.8
2.5 point gap

CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
linuxlinux kernel
redhatvirtualization host
redhatenterprise linux desktop
redhatenterprise linux server
redhatenterprise linux workstation
debiandebian linux
canonicalubuntu linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • debian debian linux8.0
  • linux linux kernelbefore 4.17
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux workstation7.0
  • redhat virtualization host4.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • [UNKNOWN] kernel

    • kernel 4.17affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 4.16.12-14.16.12-1
Debian:8linux-4.9before 4.9.110-1~deb8u14.9.110-1~deb8u1
Red Hat:enterprise_mrg:2:server:el6kernel-rtbefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-debugbefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-debug-debuginfobefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-debug-develbefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-debuginfobefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-debuginfo-common-x86_64before 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-develbefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-docbefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-firmwarebefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-tracebefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-trace-debuginfobefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-trace-develbefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-vanillabefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-vanilla-debuginfobefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:enterprise_mrg:2:server:el6kernel-rt-vanilla-develbefore 1:3.10.0-693.76.1.rt56.676.el6rt1:3.10.0-693.76.1.rt56.676.el6rt
Red Hat:rhel_aus:7.4::serverkernelbefore 0:3.10.0-693.76.1.el70:3.10.0-693.76.1.el7
Red Hat:rhel_aus:7.4::serverkernel-abi-whitelistsbefore 0:3.10.0-693.76.1.el70:3.10.0-693.76.1.el7
Red Hat:rhel_aus:7.4::serverkernel-debugbefore 0:3.10.0-693.76.1.el70:3.10.0-693.76.1.el7
Red Hat:rhel_aus:7.4::serverkernel-debug-debuginfobefore 0:3.10.0-693.76.1.el70:3.10.0-693.76.1.el7
Red Hat:rhel_aus:7.4::serverkernel-debug-develbefore 0:3.10.0-693.76.1.el70:3.10.0-693.76.1.el7
Red Hat:rhel_aus:7.4::serverkernel-debuginfobefore 0:3.10.0-693.76.1.el70:3.10.0-693.76.1.el7
Red Hat:rhel_aus:7.4::serverkernel-debuginfo-common-x86_64before 0:3.10.0-693.76.1.el70:3.10.0-693.76.1.el7

+37

Same product

linux: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux4.16.12-1 · Debian:12Package registry (OSV)
debian:linux-4.94.9.110-1~deb8u1 · Debian:8Package registry (OSV)
red hat:kernel0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-abi-whitelists0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-debug0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-debug-debuginfo0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-debug-devel0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-debuginfo0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-debuginfo-common-x86_640:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-devel0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-doc0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-tools0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-tools-debuginfo0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
red hat:kernel-tools-libs0:3.10.0-693.76.1.el7 · Red Hat:rhel_aus:7.4::serverPackage registry (OSV)
suse:kernel-azure4.4.170-4.22.1 · SUSE:Linux Enterprise Server 12 SP3Package registry (OSV)
suse:kernel-default4.12.14-25.3.1 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)
suse:kernel-docs4.12.14-25.3.1 · SUSE:Linux Enterprise Module for Development Tools 15Package registry (OSV)
suse:kernel-livepatch-SLE15_Update_11-1.3.1 · SUSE:Linux Enterprise Live Patching 15Package registry (OSV)
suse:kernel-obs-build4.12.14-25.3.1 · SUSE:Linux Enterprise Module for Development Tools 15Package registry (OSV)
suse:kernel-rt4.4.170-3.32.2 · SUSE:Linux Enterprise Real Time 12 SP3Package registry (OSV)
suse:kernel-source4.12.14-25.3.1 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)
suse:kernel-source-azure4.4.170-4.22.1 · SUSE:Linux Enterprise Server 12 SP3Package registry (OSV)
suse:kernel-syms4.12.14-25.3.1 · SUSE:Linux Enterprise Module for Development Tools 15Package registry (OSV)
suse:kernel-syms-azure4.4.170-4.22.1 · SUSE:Linux Enterprise Server 12 SP3Package registry (OSV)
suse:kernel-vanilla4.12.14-25.3.1 · SUSE:Linux Enterprise Module for Development Tools 15Package registry (OSV)
suse:kernel-zfcpdump4.12.14-25.3.1 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×2

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrylocal2018-05-30
Exploit-DB entrylocal2018-05-30

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-21 d
  2. Published
  3. TodaySep 30, 2026+3024 d
EPSS, last 120 days+1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records