Userfaultfd Access Control Vulnerability

CVE-2018-18397 · LOW Severity

AV:L/AC:L/AU:N/C:N/I:P/A:N

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.

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