CVE-2018-18386

kernel: Type confusion in drivers/tty/n_tty.c allows for a denial of service

Severity Score

3.3

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

drivers/tty/n_tty.c in the Linux kernel before 4.14.11 allows local attackers (who are able to access pseudo terminals) to hang/block further usage of any pseudo terminal devices due to an EXTPROC versus ICANON confusion in TIOCINQ.

drivers/tty/n_tty.c en el kernel de Linux en versiones anteriores a la 4.14.11 permite que atacantes locales (que pueden acceder a los pseudoterminales) bloqueen el uso de dispositivos pseudoterminal debido a una confusión EXTPROC versus ICANON en TIOCINQ.

A security flaw was found in the Linux kernel in drivers/tty/n_tty.c which allows local attackers (ones who are able to access pseudo terminals) to lock them up and block further usage of any pseudo terminal devices due to an EXTPROC versus ICANON confusion in TIOCINQ handler.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-10-16 CVE Reserved
2018-10-17 CVE Published
2023-03-08 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-704: Incorrect Type Conversion or Cast
CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')

CAPEC

References (9)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=966031f340185eddd05affcf72b740549f056348	2019-04-23
https://bugzilla.suse.com/show_bug.cgi?id=1094825	2019-04-23
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.11	2019-04-23
https://github.com/torvalds/linux/commit/966031f340185eddd05affcf72b740549f056348	2019-04-23

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2019:0831	2019-04-23
https://usn.ubuntu.com/3849-1	2019-04-23
https://usn.ubuntu.com/3849-2	2019-04-23
https://access.redhat.com/security/cve/CVE-2018-18386	2019-04-23
https://bugzilla.redhat.com/show_bug.cgi?id=1640598	2019-04-23

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				< 4.14.11 Search vendor "Linux" for product "Linux Kernel" and version " < 4.14.11"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		esm		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected