CVE-2018-18397

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CVE-2018-18397

Summary:

Details: 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.

References: https://access.redhat.com/errata/RHSA-2019:0324, https://usn.ubuntu.com/3903-1/, https://usn.ubuntu.com/3903-2/, https://access.redhat.com/errata/RHBA-2019:0327, https://access.redhat.com/errata/RHSA-2019:0163, https://access.redhat.com/errata/RHSA-2019:0831, https://usn.ubuntu.com/3901-1/, https://usn.ubuntu.com/3901-2/, https://access.redhat.com/errata/RHSA-2019:0202, https://bugs.chromium.org/p/project-zero/issues/detail?id=1700, https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.87, https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.7, https://github.com/torvalds/linux/commit/29ec90660d68bbdd69507c1c8b4e33aa299278b1, http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=29ec90660d68bbdd69507c1c8b4e33aa299278b1