Strix
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CVE-2018-18397

UnknownEPSS 0.51%

Last modified

CVE-2018-18397 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

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 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.

Metrics

EPSS Probability
0.51%

39.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
LinuxLinux Kernel< 4.19.7
RedhatOpenshift Container Platform3.11
RedhatVirtualization Host4.0
RedhatEnterprise Linux Desktop7.0
RedhatEnterprise Linux Server7.0
RedhatEnterprise Linux Server Aus7.4
RedhatEnterprise Linux Server Aus7.6
RedhatEnterprise Linux Server Eus7.4
RedhatEnterprise Linux Server Eus7.5
RedhatEnterprise Linux Server Eus7.6
RedhatEnterprise Linux Server Tus7.4
RedhatEnterprise Linux Server Tus7.6
RedhatEnterprise Linux Workstation7.0
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux16.04
CanonicalUbuntu Linux18.04
CanonicalUbuntu Linux18.10

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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 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.
How severe is CVE-2018-18397?
Severity scoring for CVE-2018-18397 is pending analysis. The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.
How do I fix CVE-2018-18397?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-18397?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST