CVE-2018-7191

Severity: medium (CVSS 5.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-05-17 · updated 2026-06-17
Weakness: CWE-476

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.

Affected products

Linux kernel: before 4.13.14 — fixed in 4.13.14

How to fix

Upgrade to a fixed version: Linux kernel 4.13.14. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00071.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00039.html
http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00048.html
http://www.securityfocus.com/bid/108380
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1743792
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1748846
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.14
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ad646c81b2182f7fa67ec0c8c825e0ee165696d
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5c25f65fd1e42685f7ccd80e0621829c105785d9
https://github.com/torvalds/linux/commit/0ad646c81b2182f7fa67ec0c8c825e0ee165696d
https://github.com/torvalds/linux/commit/5c25f65fd1e42685f7ccd80e0621829c105785d9
http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00071.html

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