CVE-2018-18397
Medium
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.
SeverityMedium
CVSS5.5
Exploit probability—
Product
Linux Kernel
PublishedDec 12, 2018
First seenDec 12, 2018
How to fix
Update
- linux linux_kernel4.19.7 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | v < 4.19.7 | 4.19.7 |
| redhat openshift_container_platform | 3.11 | — |
| redhat virtualization_host | 4.0 | — |
| redhat enterprise_linux_desktop | 7.0 | — |
| redhat enterprise_linux_server | 7.0 | — |
| redhat enterprise_linux_server_aus | 7.4, 7.6 | — |
| redhat enterprise_linux_server_eus | 7.4, 7.5, 7.6 | — |
| redhat enterprise_linux_server_tus | 7.4, 7.6 | — |
| redhat enterprise_linux_workstation | 7.0 | — |
| canonical ubuntu_linux | 14.04, 16.04, 18.04, 18.10 | — |
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