CVE-2018-18397

Medium

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.

Package Linux Kernel
Published 2018-12-12
Last modified 2024-11-21
CVSS version 3.0
Patch available
Awaiting data

CVSS 3.0 score

5.5

out of 10
Medium
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None
Vector string
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Weakness type

CWE-863

CVE-2018-18397 is classified as CWE-863

See CWE-863 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2018-18397 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

4 patch commits total View all on NVD

Frequently asked questions

  • What is CVE-2018-18397?

    CVE-2018-18397 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . CVE-2018-18397 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • What is the CVSS score for CVE-2018-18397?

    CVE-2018-18397 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.0). The vector string is CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N .

  • Is there a patch available for CVE-2018-18397?

    No patch is currently available for CVE-2018-18397. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

  • Is CVE-2018-18397 actively exploited?

    No — CVE-2018-18397 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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