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Improper Input Validation Affecting kernel package, versions <0:3.10.0-957.5.1.el7

Severity

 Recommended
high

Based on Red Hat Enterprise Linux security rating

    Threat Intelligence

    Exploit Maturity
    Mature
    EPSS
    0.04% (12th percentile)

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  • Snyk ID SNYK-RHEL7-KERNEL-4880955
  • published 26 Jul 2021
  • disclosed 26 Nov 2018
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Introduced: 26 Nov 2018

CVE-2018-18397 Open this link in a new tab
CWE-20 Open this link in a new tab

How to fix?

Upgrade RHEL:7 kernel to version 0:3.10.0-957.5.1.el7 or higher.
This issue was patched in RHSA-2019:0163.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by RHEL. See How to fix? for RHEL:7 relevant fixed versions and status.

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 file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.