Linux Kernel 3.10/4.14/4.18 vfio Interface resource consumption

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel 3.10/4.14/4.18. This affects an unknown part of the component vfio Interface. Performing a manipulation results in resource consumption. This vulnerability is reported as CVE-2019-3882. The attack requires a local approach. No exploit exists.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel 3.10/4.14/4.18 (Operating System). This affects an unknown functionality of the component vfio Interface. The manipulation with an unknown input leads to a resource consumption vulnerability. CWE is classifying the issue as CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. This is going to have an impact on availability. The summary by CVE is:

A flaw was found in the Linux kernel's vfio interface implementation that permits violation of the user's locked memory limit. If a device is bound to a vfio driver, such as vfio-pci, and the local attacker is administratively granted ownership of the device, it may cause a system memory exhaustion and thus a denial of service (DoS). Versions 3.10, 4.14 and 4.18 are vulnerable.

The bug was discovered 04/03/2019. The weakness was disclosed 04/24/2019 by Alex as confirmed bug report (Bugzilla). The advisory is shared at bugzilla.redhat.com. This vulnerability is uniquely identified as CVE-2019-3882 since 01/03/2019. An attack has to be approached locally. The successful exploitation needs a authentication. Neither technical details nor an exploit are publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 21 days. During that time the estimated underground price was around $0-$5k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 277783 (Fedora Security Update for kernel-headers kernel-tools kernel (FEDORA-2019-65c6d11eba)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 106478†). The entries VDB-128716, VDB-132077, VDB-134461 and VDB-135170 are pretty similar. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 3.10
• 4.14
• 4.18

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion