F5 Networks BIG-IP : Linux kernel KVM subsystem vulnerability (K11186236)

Medium Nessus Plugin ID 132554


The remote device is missing a vendor-supplied security patch.


In the Linux kernel before 4.20.8, kvm_ioctl_create_device in virt/kvm/kvm_main.c mishandles reference counting because of a race condition, leading to a use-after-free. (CVE-2019-6974)



An attacker may use this vulnerability to cause a vCMP guest to crash,resulting in a denial-of-service orgain privileged access to the vCMP hypervisor host system. This vulnerability affects only hardware platforms that are vCMP-capable and are provisioned for vCMP. For a list of vCMP capable hardware platforms, refer to K14088: vCMP host and compatible guest version matrix.

BIG-IQ, Enterprise Manager, F5 iWorkflow, Traffix SDC

There is no impact; these F5 products are not affected by this vulnerability.


Upgrade to one of the non-vulnerable versions listed in the F5 Solution K11186236.

See Also



Plugin Details

Severity: Medium

ID: 132554

File Name: f5_bigip_SOL11186236.nasl

Version: 1.3

Type: local

Published: 2019/12/31

Updated: 2020/05/01

Dependencies: 76940

Configuration: Enable paranoid mode

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.8

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

Base Score: 8.1

Temporal Score: 7.3

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:f5:big-ip_access_policy_manager, cpe:/a:f5:big-ip_advanced_firewall_manager, cpe:/a:f5:big-ip_application_acceleration_manager, cpe:/a:f5:big-ip_application_security_manager, cpe:/a:f5:big-ip_application_visibility_and_reporting, cpe:/a:f5:big-ip_global_traffic_manager, cpe:/a:f5:big-ip_link_controller, cpe:/a:f5:big-ip_local_traffic_manager, cpe:/a:f5:big-ip_policy_enforcement_manager, cpe:/a:f5:big-ip_webaccelerator, cpe:/h:f5:big-ip

Required KB Items: Host/local_checks_enabled, Host/BIG-IP/hotfix, Host/BIG-IP/modules, Host/BIG-IP/version, Settings/ParanoidReport

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2019/04/19

Vulnerability Publication Date: 2019/02/15

Reference Information

CVE: CVE-2019-6974