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CVE-2018-7191

21
FAUCET Score

CVE-2018-7191 is a denial-of-service vulnerability affecting the Linux kernel before version 4.13.14, specifically within the tun subsystem. A local attacker can trigger a NULL pointer dereference and system panic by providing a specially crafted device name containing a '/' character during an ioctl(TUNSETIFF) call. This vulnerability has a CVSS score of 5.5 (Medium), indicating a low attack complexity and requiring local privileges, with the primary impact being system availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.13.14CPE matchmatch criteria
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.5MEDIUM

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
0.65%
Probability of exploitation in next 30 days
EPSS Percentile
47.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0065 is in the 95th percentile among its peer group of 15,938 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

github_advisorypatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-rt-0:3.10.0-1127.rt56.1093.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: kernel-0:3.10.0-1127.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.6 Extended Update SupportFixed in: kernel-0:3.10.0-957.56.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.7 Extended Update SupportFixed in: kernel-0:3.10.0-1062.26.1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4.2 for Red Hat Enterprise Linux 7.6 EUSFixed in: kernel-0:3.10.0-957.56.1.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: kernel

Vendor Advisories (1)

redhatCVE-2018-7191Moderate

kernel: denial of service via ioctl call in network tun handling

Jan 17, 2018

References

lists.opensuse.org / opensuse-security-announce/2019-05/msg00071.html
lists.opensuse.org / opensuse-security-announce/2019-06/msg00039.html
lists.opensuse.org / opensuse-security-announce/2019-06/msg00048.html
bugs.launchpad.net / ubuntu/+source/linux/+bug/1743792
ExploitThird Party Advisory
bugs.launchpad.net / ubuntu/+source/linux/+bug/1748846
PatchThird Party Advisory
cdn.kernel.org / pub/linux/kernel/v4.x/ChangeLog-4.13.14
Release NotesVendor Advisory
github.com / torvalds/linux/commit/0ad646c81b2182f7fa67ec0c8c825e0ee165696d
PatchThird Party Advisory
github.com / torvalds/linux/commit/5c25f65fd1e42685f7ccd80e0621829c105785d9
PatchThird Party Advisory
git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
PatchThird Party AdvisoryVendor Advisory
git.kernel.org / cgit/linux/kernel/git/torvalds/linux.git/commit
PatchVendor Advisory
securityfocus.com / bid/108380