Published: 12/12/2018 Updated: 24/08/2020

CVSS v2 Base Score: 2.1 | Impact Score: 2.9 | Exploitability Score: 3.9

CVSS v3 Base Score: 5.5 | Impact Score: 3.6 | Exploitability Score: 1.8

VMScore: 187

Vector: AV:L/AC:L/Au:N/C:N/I:P/A:N

The userfaultfd implementation in the Linux kernel prior to 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.

Vulnerable Product	Search on Vulmon	Subscribe to Product
linux linux kernel
redhat enterprise linux server aus 7.4
redhat enterprise linux server eus 7.4
redhat enterprise linux server eus 7.6
redhat enterprise linux server tus 7.4
redhat enterprise linux server tus 7.6
redhat enterprise linux workstation 7.0
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 7.6
redhat enterprise linux server eus 7.5
canonical ubuntu linux 16.04
canonical ubuntu linux 18.04
canonical ubuntu linux 18.10
canonical ubuntu linux 14.04

Synopsis Moderate: kernel security and bug fix update Type/Severity Security Advisory: Moderate Topic An update for kernel is now available for Red Hat Enterprise Linux 75 Extended Update SupportRed Hat Product Security has rated this update as having a security impact of Moderate A Common Vulnerability ...

Synopsis Important: kernel security, bug fix, and enhancement update Type/Severity Security Advisory: Important Topic An update for kernel is now available for Red Hat Enterprise Linux 7Red Hat Product Security has rated this update as having a security impact of Important A Common Vulnerability Scoring S ...

Synopsis Moderate: kernel security and bug fix update Type/Severity Security Advisory: Moderate Topic An update for kernel is now available for Red Hat Enterprise Linux 74 Extended Update SupportRed Hat Product Security has rated this update as having a security impact of Moderate A Common Vulnerability ...

Synopsis Important: kernel-alt security and bug fix update Type/Severity Security Advisory: Important Topic An update for kernel-alt is now available for Red Hat Enterprise Linux 7Red Hat Product Security has rated this update as having a security impact of Important A Common Vulnerability Scoring System ...

Several security issues were fixed in the Linux kernel ...

A flaw was found in the Linux kernel with files on tmpfs and hugetlbfs An attacker is able to bypass file permissions on filesystems mounted with tmpfs/hugetlbs to modify a file and possibly disrupt normal system behavior At this time there is an understanding there is no crash or privilege escalation but the impact of modifications on these file ...

Linux userfaultfd bypasses tmpfs file permissions ...

CWE-863 https://github.com/torvalds/linux/commit/29ec90660d68bbdd69507c1c8b4e33aa299278b1 https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.7 https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.87 https://bugs.chromium.org/p/project-zero/issues/detail?id=1700 http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=29ec90660d68bbdd69507c1c8b4e33aa299278b1 https://access.redhat.com/errata/RHSA-2019:0202 https://access.redhat.com/errata/RHSA-2019:0163 https://access.redhat.com/errata/RHSA-2019:0324 https://usn.ubuntu.com/3901-2/https://usn.ubuntu.com/3901-1/https://usn.ubuntu.com/3903-2/https://usn.ubuntu.com/3903-1/https://access.redhat.com/errata/RHSA-2019:0831 https://access.redhat.com/errata/RHBA-2019:0327 https://nvd.nist.gov https://access.redhat.com/errata/RHSA-2019:0202 https://usn.ubuntu.com/3901-1/

CVE-2018-18397

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