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CVE-2018-18281· NVD / CVE Program· CNA mitre

Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks.

Since Linux kernel version 3.2, the mremap() syscall performs TLB flushes after dropping pagetable locks. If a syscall such as ftruncate() removes entries from the pagetables of a task that is in the middle of mremap(), a stale TLB entry can remain for a short time that permits access to a physical page after it has been released back to the page allocator and reused. This is fixed in the following kernel versions: 4.9.135, 4.14.78, 4.18.16, 4.19.

HighCVSS 7.8 · v3.0—No exploit Fix available
Published
Oct 30, 2018
Updated
Jun 16, 2026
EPSS
1.1% · 63th percentile
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Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

Affected systems

VendorProduct
linuxlinux kernel
canonicalubuntu linux
debiandebian linux

Affected versions

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

  • canonical ubuntu linux12.04
  • canonical ubuntu linux14.04
  • canonical ubuntu linux16.04
  • canonical ubuntu linux18.04
  • canonical ubuntu linux18.10
  • debian debian linux8.0
  • linux linux kernel4.18.17 and later · before 4.19
  • linux linux kernel4.14.79 and later · before 4.18.16
  • linux linux kernel4.9.136 and later · before 4.14.78
  • linux linux kernel3.2 and later · before 4.9.135

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 4.18.20-14.18.20-1
Debian:8linuxbefore 3.16.64-13.16.64-1
Debian:8linux-4.9before 4.9.144-3.1~deb8u14.9.144-3.1~deb8u1
Red Hat:enterprise_linux:7::clientbpftoolbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientbpftool-debuginfobefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernelbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-abi-whitelistsbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-debugbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-debug-debuginfobefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-debug-develbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-debuginfobefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-debuginfo-common-x86_64before 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-develbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-docbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-toolsbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-tools-debuginfobefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-tools-libsbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientkernel-tools-libs-develbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientperfbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientperf-debuginfobefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientpython-perfbefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::clientpython-perf-debuginfobefore 0:3.10.0-1062.el70:3.10.0-1062.el7
Red Hat:enterprise_linux:7::serverkernelbefore 0:4.14.0-115.7.1.el7a0:4.14.0-115.7.1.el7a
Red Hat:enterprise_linux:7::serverkernel-abi-whitelistsbefore 0:4.14.0-115.7.1.el7a0:4.14.0-115.7.1.el7a

+96

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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:linux4.18.20-1 · Debian:12Package registry (OSV)
debian:linux-4.94.9.144-3.1~deb8u1 · Debian:8Package registry (OSV)
red hat:kernel0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-abi-whitelists0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-alt0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-bootwrapper0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-debug0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-debug-debuginfo0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-debuginfo0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-devel0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-doc0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-headers0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
red hat:kernel-tools0:4.14.0-115.7.1.el7a · Red Hat:enterprise_linux:7::serverPackage registry (OSV)
suse:kernel-bigmem3.0.101-108.81.1 · SUSE:Linux Enterprise Server 11 SP4Package registry (OSV)
suse:kernel-default4.4.162-94.69.2 · SUSE:Linux Enterprise Desktop 12 SP3Package registry (OSV)
suse:kernel-docs4.4.162-94.69.2 · SUSE:Linux Enterprise Software Development Kit 12 SP3Package registry (OSV)
suse:kernel-ec23.0.101-108.81.1 · SUSE:Linux Enterprise Server 11 SP4Package registry (OSV)
suse:kernel-obs-build4.4.162-94.69.2 · SUSE:Linux Enterprise Software Development Kit 12 SP3Package registry (OSV)
suse:kernel-pae3.0.101-108.81.1 · SUSE:Linux Enterprise Server 11 SP4Package registry (OSV)
suse:kernel-ppc643.0.101-108.81.1 · SUSE:Linux Enterprise Server 11 SP4Package registry (OSV)
suse:kernel-source4.4.162-94.69.2 · SUSE:Linux Enterprise Desktop 12 SP3Package registry (OSV)
suse:kernel-syms4.4.162-94.69.2 · SUSE:Linux Enterprise Desktop 12 SP3Package registry (OSV)
suse:kernel-trace3.0.101-108.81.1 · SUSE:Linux Enterprise Server 11 SP4Package registry (OSV)
suse:kgraft-patch-SLE12-SP3_Update_211-4.5.2 · SUSE:Linux Enterprise Live Patching 12 SP3Package registry (OSV)
suse:lttng-modules2.7.1-8.6.1 · SUSE:Linux Enterprise Server 12 SP3Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

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.

No dated events beyond publication.

EPSS, last 120 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.

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

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-459 · Incomplete Cleanup

CVSS vector

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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.

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Change log

  1. Fix✗ → ✓

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References

All records