CVE-2018-20836

kernel: race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c leads to use-after-free

Severity Score

8.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

An issue was discovered in the Linux kernel before 4.20. There is a race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c, leading to a use-after-free.

Fue descubierto un fallo en el kernel de Linux anterior a 4.20. Hay una condición de carrera en smp_task_timedout() y smp_task_done() en drivers/scsi/libsas/sas_expander.c, permitiendo el uso después de liberación de memoria.

A flaw was found in the Linux kernel’s implementation of the SAS expander subsystem, where a race condition exists in the smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c. An attacker could abuse this flaw to corrupt memory and escalate privileges.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-05-07 CVE Reserved
2019-05-07 CVE Published
2024-08-05 CVE Updated
2024-11-06 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-416: Use After Free

CAPEC

References (16)

URL	Tag	Source
http://www.securityfocus.com/bid/108196	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html	Mailing List
https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html	Mailing List
https://seclists.org/bugtraq/2019/Aug/13	Mailing List
https://seclists.org/bugtraq/2019/Aug/18	Mailing List
https://security.netapp.com/advisory/ntap-20190719-0003	Third Party Advisory
https://support.f5.com/csp/article/K11225249	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd6f2b905905fb42671009dc0e27c310a16ae	2022-11-03
https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16ae	2022-11-03

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html	2022-11-03
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html	2022-11-03
https://usn.ubuntu.com/4076-1	2022-11-03
https://www.debian.org/security/2019/dsa-4495	2022-11-03
https://www.debian.org/security/2019/dsa-4497	2022-11-03
https://access.redhat.com/security/cve/CVE-2018-20836	2021-01-05
https://bugzilla.redhat.com/show_bug.cgi?id=1707796	2021-01-05

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"				< 3.16.72 Search vendor "Linux" for product "Linux Kernel" and version " < 3.16.72"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.17 < 3.18.140 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.17 < 3.18.140"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 3.19 < 4.4.180 Search vendor "Linux" for product "Linux Kernel" and version " >= 3.19 < 4.4.180"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.5 < 4.9.175 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.5 < 4.9.175"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.10 < 4.14.118 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.10 < 4.14.118"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				>= 4.15 < 4.19.42 Search vendor "Linux" for product "Linux Kernel" and version " >= 4.15 < 4.19.42"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		esm		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				8.0 Search vendor "Debian" for product "Debian Linux" and version "8.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
F5 Search vendor "F5"		Traffix Signaling Delivery Controller Search vendor "F5" for product "Traffix Signaling Delivery Controller"				5.0.0 Search vendor "F5" for product "Traffix Signaling Delivery Controller" and version "5.0.0"		-		Affected
F5 Search vendor "F5"		Traffix Signaling Delivery Controller Search vendor "F5" for product "Traffix Signaling Delivery Controller"				5.1.0 Search vendor "F5" for product "Traffix Signaling Delivery Controller" and version "5.1.0"		-		Affected
Netapp Search vendor "Netapp"		Active Iq Unified Manager Search vendor "Netapp" for product "Active Iq Unified Manager"				>= 9.5 Search vendor "Netapp" for product "Active Iq Unified Manager" and version " >= 9.5"		vmware_vsphere		Affected
Netapp Search vendor "Netapp"		Snapprotect Search vendor "Netapp" for product "Snapprotect"				-		-		Affected
Netapp Search vendor "Netapp"		Solidfire \& Hci Management Node Search vendor "Netapp" for product "Solidfire \& Hci Management Node"				-		-		Affected
Netapp Search vendor "Netapp"		Solidfire \& Hci Storage Node Search vendor "Netapp" for product "Solidfire \& Hci Storage Node"				-		-		Affected
Netapp Search vendor "Netapp"		Storage Replication Adapter For Clustered Data Ontap Search vendor "Netapp" for product "Storage Replication Adapter For Clustered Data Ontap"				-		vmware_vsphere		Affected
Netapp Search vendor "Netapp"		Vasa Provider For Clustered Data Ontap Search vendor "Netapp" for product "Vasa Provider For Clustered Data Ontap"				>= 7.2 Search vendor "Netapp" for product "Vasa Provider For Clustered Data Ontap" and version " >= 7.2"		-		Affected
Netapp Search vendor "Netapp"		Virtual Storage Console Search vendor "Netapp" for product "Virtual Storage Console"				>= 7.2 Search vendor "Netapp" for product "Virtual Storage Console" and version " >= 7.2"		vmware_vsphere		Affected
Netapp Search vendor "Netapp"		Hci Compute Node Search vendor "Netapp" for product "Hci Compute Node"				-		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.0 Search vendor "Opensuse" for product "Leap" and version "15.0"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		Affected