CVE & CISA-KEV Catalog

CVE-2018-18281

HIGH
7.8
CVSS v3
NVD

Description

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.

CWE-459

How to fix

Remediation Available
linuxDebian
Fixed in:4.18.20-1CVE-2018-18281
Fixed in:4.18.20-1CVE-2018-18281
Fixed in:4.18.20-1CVE-2018-18281
Fixed in:4.18.20-1CVE-2018-18281
linuxUbuntu
Fixed in:3.13.0-165.215USN-3880-1
Fixed in:4.15.0-44.47USN-3871-1
linux-awsUbuntu
Fixed in:4.15.0-1032.34USN-3871-3
linux-aws-hweUbuntu
Fixed in:4.15.0-1032.34~16.04.1USN-3871-4
linux-azureUbuntu
Fixed in:4.15.0-1037.39~14.04.2USN-3871-5
Fixed in:4.15.0-1037.39~16.04.1USN-3871-5
Fixed in:4.15.0-1037.39USN-3871-5
linux-gcpUbuntu
Fixed in:4.15.0-1027.28~16.04.1USN-3871-4
Fixed in:4.15.0-1027.28USN-3871-3
linux-hweUbuntu
Fixed in:4.15.0-45.48~16.04.1USN-3871-4
linux-image-3.13.0-165-genericUbuntu
Fixed in:3.13.0-165.215USN-3880-1
linux-image-3.13.0-165-generic-lpaeUbuntu
Fixed in:3.13.0-165.215USN-3880-1
linux-image-3.13.0-165-lowlatencyUbuntu
Fixed in:3.13.0-165.215USN-3880-1
linux-image-3.13.0-165-powerpc-e500Ubuntu
Fixed in:3.13.0-165.215USN-3880-1
linux-image-3.13.0-165-powerpc-e500mcUbuntu
Fixed in:3.13.0-165.215USN-3880-1
linux-image-3.13.0-165-powerpc-smpUbuntu
Fixed in:3.13.0-165.215USN-3880-1
linux-image-3.13.0-165-powerpc64-embUbuntu
Fixed in:3.13.0-165.215USN-3880-1
linux-image-3.13.0-165-powerpc64-smpUbuntu
Fixed in:3.13.0-165.215USN-3880-1
linux-image-4.15.0-1027-gcpUbuntu
Fixed in:4.15.0-1027.28~16.04.1USN-3871-4
Fixed in:4.15.0-1027.28USN-3871-3
linux-image-4.15.0-1029-kvmUbuntu
Fixed in:4.15.0-1029.29USN-3871-3
linux-image-4.15.0-1031-raspi2Ubuntu
Fixed in:4.15.0-1031.33USN-3871-3
linux-image-4.15.0-1032-awsUbuntu
Fixed in:4.15.0-1032.34~16.04.1USN-3871-4
Fixed in:4.15.0-1032.34USN-3871-3
linux-image-4.15.0-1033-oemUbuntu
Fixed in:4.15.0-1033.38USN-3871-3
linux-image-4.15.0-1037-azureUbuntu
Fixed in:4.15.0-1037.39~14.04.2USN-3871-5
Fixed in:4.15.0-1037.39~16.04.1USN-3871-5
Fixed in:4.15.0-1037.39USN-3871-5
linux-image-4.15.0-44-genericUbuntu
Fixed in:4.15.0-44.47USN-3871-1
linux-image-4.15.0-44-generic-lpaeUbuntu
Fixed in:4.15.0-44.47USN-3871-1
linux-image-4.15.0-44-lowlatencyUbuntu
Fixed in:4.15.0-44.47USN-3871-1
linux-image-4.15.0-44-snapdragonUbuntu
Fixed in:4.15.0-44.47USN-3871-1
linux-image-4.15.0-45-genericUbuntu
Fixed in:4.15.0-45.48~16.04.1USN-3871-4
linux-image-4.15.0-45-generic-lpaeUbuntu
Fixed in:4.15.0-45.48~16.04.1USN-3871-4
linux-image-4.15.0-45-lowlatencyUbuntu
Fixed in:4.15.0-45.48~16.04.1USN-3871-4
linux-image-awsUbuntu
Fixed in:4.15.0.1032.31USN-3871-3
linux-image-aws-hweUbuntu
Fixed in:4.15.0.1032.33USN-3871-4
linux-image-azureUbuntu
Fixed in:4.15.0.1037.24USN-3871-5
Fixed in:4.15.0.1037.42USN-3871-5
Fixed in:4.15.0.1037.37USN-3871-5
linux-image-gcpUbuntu
Fixed in:4.15.0.1027.41USN-3871-4
Fixed in:4.15.0.1027.29USN-3871-3
linux-image-genericUbuntu
Fixed in:3.13.0.165.175USN-3880-1
Fixed in:4.15.0.44.46USN-3871-1
linux-image-generic-hwe-16.04Ubuntu
Fixed in:4.15.0.45.66USN-3871-4
linux-image-generic-lpaeUbuntu
Fixed in:3.13.0.165.175USN-3880-1
Fixed in:4.15.0.44.46USN-3871-1
linux-image-generic-lpae-hwe-16.04Ubuntu
Fixed in:4.15.0.45.66USN-3871-4
linux-image-gkeUbuntu
Fixed in:4.15.0.1027.41USN-3871-4
Fixed in:4.15.0.1027.29USN-3871-3
linux-image-kvmUbuntu
Fixed in:4.15.0.1029.29USN-3871-3
linux-image-lowlatencyUbuntu
Fixed in:3.13.0.165.175USN-3880-1
Fixed in:4.15.0.44.46USN-3871-1
linux-image-lowlatency-hwe-16.04Ubuntu
Fixed in:4.15.0.45.66USN-3871-4
linux-image-oemUbuntu
Fixed in:4.15.0.45.66USN-3871-4
Fixed in:4.15.0.1033.38USN-3871-3
linux-image-powerpc-e500Ubuntu
Fixed in:3.13.0.165.175USN-3880-1
linux-image-powerpc-e500mcUbuntu
Fixed in:3.13.0.165.175USN-3880-1
linux-image-powerpc-smpUbuntu
Fixed in:3.13.0.165.175USN-3880-1
linux-image-powerpc64-embUbuntu
Fixed in:3.13.0.165.175USN-3880-1
linux-image-powerpc64-smpUbuntu
Fixed in:3.13.0.165.175USN-3880-1
linux-image-raspi2Ubuntu
Fixed in:4.15.0.1031.29USN-3871-3
linux-image-snapdragonUbuntu
Fixed in:4.15.0.44.46USN-3871-1
linux-image-virtual-hwe-16.04Ubuntu
Fixed in:4.15.0.45.66USN-3871-4
linux-kvmUbuntu
Fixed in:4.15.0-1029.29USN-3871-3
linux-oemUbuntu
Fixed in:4.15.0-1033.38USN-3871-3
linux-raspi2Ubuntu
Fixed in:4.15.0-1031.33USN-3871-3

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

1.06%probability of exploitation in 30 days
60thpercentile

Moderate risk: more likely to be exploited than 60% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.