MEDIUM

CVE-2018-7191

CVSS v3

5.5

MEDIUM

EPSS Score

0.7 %

exploit probability, as of 2026-10-18

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2018-7191 Red Hat Product Security438 products fixed · 27 known affected
kernel: denial of service via ioctl call in network tun handling
kernel.src as a component of Red Hat Enterprise Linux 5 · kernel as a component of Red Hat Enterprise Linux 6 · kernel-abi-whitelists as a component of Red Hat Enterprise Linux 6
RHSA-2020:2851 Red Hat Product Security111 products fixed
Red Hat Security Advisory: kernel security and bug fix update
RHSA-2020:2522 Red Hat Product Security120 products fixed
Red Hat Security Advisory: kernel security and bug fix update
RHSA-2020:1070 Red Hat Product Security33 products fixed
Red Hat Security Advisory: kernel-rt security and bug fix update
RHSA-2020:1016 Red Hat Product Security174 products fixed
Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Full record on NVD

Description

In the tun subsystem in the Linux kernel before 4.13.14, dev_get_valid_name is not called before register_netdevice. This allows local users to cause a denial of service (NULL pointer dereference and panic) via an ioctl(TUNSETIFF) call with a dev name containing a / character. This is similar to CVE-2013-4343.

Technical details

Published: 2019-05-17

Frequently asked questions

What is CVE-2018-7191?

Is CVE-2018-7191 actively exploited?

Active exploitation of CVE-2018-7191 has not been confirmed. Its EPSS score was 0.7% on 2026-10-18, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-7191?

CVE-2018-7191 has a CVSS v3 base score of 5.5 (MEDIUM severity).

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