Vulnerability Details : CVE-2018-20836
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.
Vulnerability category: Memory Corruption
Exploit prediction scoring system (EPSS) score for CVE-2018-20836
Probability of exploitation activity in the next 30 days: 0.82%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 80 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2018-20836
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
---|---|---|---|---|---|
9.3
|
HIGH | AV:N/AC:M/Au:N/C:C/I:C/A:C |
8.6
|
10.0
|
NIST |
8.1
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2
|
5.9
|
NIST |
CWE ids for CVE-2018-20836
-
The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.Assigned by: nvd@nist.gov (Primary)
-
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-20836
-
https://www.debian.org/security/2019/dsa-4495
Debian -- Security Information -- DSA-4495-1 linuxThird Party Advisory
-
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b90cd6f2b905905fb42671009dc0e27c310a16ae
kernel/git/torvalds/linux.git - Linux kernel source treePatch;Vendor Advisory
-
https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html
[SECURITY] [DLA 1884-1] linux security updateMailing List;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20190719-0003/
May 2019 Linux Kernel Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
-
https://github.com/torvalds/linux/commit/b90cd6f2b905905fb42671009dc0e27c310a16ae
scsi: libsas: fix a race condition when smp task timeout · torvalds/linux@b90cd6f · GitHubPatch;Vendor Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00025.html
[security-announce] openSUSE-SU-2019:1757-1: important: Security updateMailing List;Third Party Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00014.html
[security-announce] openSUSE-SU-2019:1716-1: important: Security updateMailing List;Third Party Advisory
-
https://www.debian.org/security/2019/dsa-4497
Debian -- Security Information -- DSA-4497-1 linuxThird Party Advisory
-
https://usn.ubuntu.com/4076-1/
USN-4076-1: Linux kernel vulnerabilities | Ubuntu security noticesThird Party Advisory
-
https://support.f5.com/csp/article/K11225249
Third Party Advisory
-
https://seclists.org/bugtraq/2019/Aug/13
Bugtraq: [SECURITY] [DSA 4495-1] linux security updateMailing List;Third Party Advisory
-
http://www.securityfocus.com/bid/108196
Linux Kernel CVE-2018-20836 Race Condition VulnerabilityThird Party Advisory;VDB Entry
-
https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html
[SECURITY] [DLA 1885-1] linux-4.9 security updateMailing List;Third Party Advisory
-
https://seclists.org/bugtraq/2019/Aug/18
Bugtraq: [SECURITY] [DSA 4497-1] linux security updateMailing List;Third Party Advisory
Products affected by CVE-2018-20836
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:a:f5:traffix_signaling_delivery_controller:5.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:f5:traffix_signaling_delivery_controller:5.0.0:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
- cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:virtual_storage_console:*:*:*:*:*:vmware_vsphere:*:*
- cpe:2.3:h:netapp:hci_compute_node:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:vmware_vsphere:*:*
- cpe:2.3:a:netapp:storage_replication_adapter_for_clustered_data_ontap:-:*:*:*:*:vmware_vsphere:*:*
- cpe:2.3:a:netapp:vasa_provider_for_clustered_data_ontap:*:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:snapprotect:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:solidfire_\&_hci_storage_node:-:*:*:*:*:*:*:*