UBUNTU-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.
02 / AFFECTED SOFTWARE
Affected packages
8 explicit affected versions
3 explicit affected versions
31 explicit affected versions
26 explicit affected versions
46 explicit affected versions
2 explicit affected versions
25 explicit affected versions
19 explicit affected versions
22 explicit affected versions
18 explicit affected versions
3 explicit affected versions
3 explicit affected versions
19 explicit affected versions
16 explicit affected versions
2 explicit affected versions
21 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://lore.kernel.org/lkml/[email protected]/
- https://ubuntu.com/security/CVE-2018-18397
- https://ubuntu.com/security/notices/USN-3901-1
- https://ubuntu.com/security/notices/USN-3901-2
- https://ubuntu.com/security/notices/USN-3903-1
- https://ubuntu.com/security/notices/USN-3903-2
- https://www.cve.org/CVERecord?id=CVE-2018-18397