synced 9 MIN AGO
01 Record

CVE-2018-18397

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs

UnratedPUBLISHEDCNA: mitre
CNA base scoreUnratedNo CNA CVSS vector

02 Description

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs

03 Exploitation and scoring

Exploitation
Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision
Not assessed by CISA
EPSS probability
0.51% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 43.2% of scored records. A rank, not a probability.
NVD base score
5.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2018-12-12 07:00Z7 YR AGO
Last updated
2024-08-05 11:08Z2 YR AGO
Reserved
2018-10-16
Assigning CNA
mitre
Record state
PUBLISHED
Severity
Not rated by the issuing CNA
CNA CVSS vector
Not published by the issuing CNA
Weaknesses
  • CWE-863Incorrect AuthorizationClass
  • CWE-20Improper Input ValidationClass
Data version
5.1
Document digest
1f225a648a1de8d9b4ff520c87166b387f21d3253842f7e79a74a1d1d5d3861b

05 Affected products

VendorProductVersionsPlatforms
canonicalubuntu_linuxNot specified—
linuxlinux_kernelNot specified—
redhatenterprise_linuxNot specified—
redhatenterprise_linux_desktopNot specified—
redhatenterprise_linux_serverNot specified—
redhatenterprise_linux_server_ausNot specified—
redhatenterprise_linux_server_eusNot specified—
redhatenterprise_linux_server_tusNot specified—
redhatenterprise_linux_workstationNot specified—
redhatenterprise_mrgNot specified—
redhatopenshift_container_platformNot specified—
redhatrhel_eusNot specified—
redhatvirtualization_hostNot specified—

06 References

07 Fixed in

Debian 12

  • linux
    Fixed in 4.19.9-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • linux
    Fixed in 4.19.9-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • linux
    Fixed in 4.19.9-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 14.04 LTS

  • linux-azure
    Fixed in 4.15.0-1040.44~14.04.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 16.04 LTS

  • linux-aws-hwe
    Fixed in 4.15.0-1033.35~16.04.1
  • linux-azure
    Fixed in 4.15.0-1040.44
  • linux-gcp
    Fixed in 4.15.0-1028.29~16.04.1
  • linux-hwe
    Fixed in 4.15.0-46.49~16.04.1
  • linux-oracle
    Fixed in 4.15.0-1009.11~16.04.1

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 18.04 LTS

  • linux
    Fixed in 4.15.0-46.49
  • linux-aws
    Fixed in 4.15.0-1033.35
  • linux-azure
    Fixed in 4.18.0-1013.13~18.04.1
  • linux-gcp
    Fixed in 4.15.0-1028.29
  • linux-gcp-edge
    Fixed in 4.18.0-1007.8~18.04.1
  • linux-hwe
    Fixed in 4.18.0-16.17~18.04.1
  • linux-kvm
    Fixed in 4.15.0-1030.30
  • linux-oem
    Fixed in 4.15.0-1034.39
  • linux-oracle
    Fixed in 4.15.0-1009.11
  • linux-raspi2
    Fixed in 4.15.0-1032.34

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.