CVE-2018-18397

Severity

21%

Complexity

39%

Confidentiality

48%

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.

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.

CVSS 3.0 Base Score 5.5. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N).

CVSS 2.0 Base Score 2.1. CVSS Attack Vector: local. CVSS Attack Complexity: low. CVSS Vector: (AV:L/AC:L/Au:N/C:N/I:P/A:N).

Overview

First reported 6 years ago

2018-12-12 10:29:00

Last updated 5 years ago

2019-10-03 00:03:00

Affected Software

Linux Kernel

Red Hat OpenShift Container Platform 3.11

3.11

Red Hat Virtualization Host 4.0

4.0

RedHat Enterprise Linux Desktop 7.0

7.0

RedHat Enterprise Linux Server 7.0

7.0

Red Hat Enterprise Linux Server Advanced mission critical Update Support (AUS) 7.4

7.4

Red Hat Enterprise Linux Server Advanced mission critical Update Support (AUS) 7.6

7.6

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.4

7.4

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.5

7.5

Red Hat Enterprise Linux Server Extended Update Support (EUS) 7.6

7.6

Red Hat Enterprise Linux Server TUS 7.4

7.4

Red Hat Enterprise Linux Server Telecommunications Update Service (TUS) 7.6

7.6

RedHat Enterprise Linux Workstation 7.0

7.0

Canonical Ubuntu Linux 14.04 LTS (Long-Term Support)

14.04

Canonical Ubuntu Linux 16.04 LTS (Long-Term Support)

16.04

Canonical Ubuntu Linux 18.04 LTS Edition

18.04

Canonical Ubuntu Linux 18.10

18.10

References

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=29ec90660d68bbdd69507c1c8b4e33aa299278b1

Patch, Third Party Advisory

RHBA-2019:0327

Third Party Advisory

RHSA-2019:0163

Third Party Advisory

RHSA-2019:0202

Third Party Advisory

RHSA-2019:0324

Third Party Advisory

RHSA-2019:0831

Third Party Advisory

https://bugs.chromium.org/p/project-zero/issues/detail?id=1700

Exploit, Issue Tracking, Third Party Advisory

https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.87

Patch, Vendor Advisory

https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.7

Patch, Vendor Advisory

https://github.com/torvalds/linux/commit/29ec90660d68bbdd69507c1c8b4e33aa299278b1

Patch, Third Party Advisory

USN-3901-1

Third Party Advisory

USN-3901-2

Third Party Advisory

USN-3903-1

Third Party Advisory

USN-3903-2

Third Party Advisory

Stay updated

ExploitPedia is constantly evolving. Sign up to receive a notification when we release additional functionality.

Get in touch

If you'd like to report a bug or have any suggestions for improvements then please do get in touch with us using this form. We will get back to you as soon as we can.