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
0
*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.
It was discovered that a race condition existed in the Serial Attached SCSI implementation in the Linux kernel. A local attacker could possibly use this to cause a denial of service or execute arbitrary code. It was discovered that the ext4 file system implementation in the Linux kernel did not properly zero out memory in some situations. A local attacker could use this to expose sensitive information. Various other issues were also addressed.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* 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
- 2025-03-30 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 |
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| https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html | Mailing List |
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| https://seclists.org/bugtraq/2019/Aug/13 | Mailing List |
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| https://seclists.org/bugtraq/2019/Aug/18 | Mailing List |
|
| https://security.netapp.com/advisory/ntap-20190719-0003 | Third Party Advisory |
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| https://support.f5.com/csp/article/K11225249 | Third Party Advisory |
| URL | Date | SRC |
|---|
| 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
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| 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
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| 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
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| 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
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| 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
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| 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
| ||||||