Linux Kernel Virtual Function mbochs.c mbochs_ioctl information disclosure

CVSS Meta Temp Score
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CTI Interest Score
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4.8$0-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Linux Kernel. The impacted element is the function mbochs_ioctl of the file samples/vfio-mdev/mbochs.c of the component Virtual Function Handler. Performing a manipulation results in information disclosure. This vulnerability is reported as CVE-2021-3736. The attack is possible to be carried out remotely. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel (Operating System) (affected version not known). This affects the function mbochs_ioctl of the file samples/vfio-mdev/mbochs.c of the component Virtual Function Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

A flaw was found in the Linux kernel. A memory leak problem was found in mbochs_ioctl in samples/vfio-mdev/mbochs.c in Virtual Function I/O (VFIO) Mediated devices. This flaw could allow a local attacker to leak internal kernel information.

The weakness was disclosed 08/24/2022. It is possible to read the advisory at access.redhat.com. This vulnerability is uniquely identified as CVE-2021-3736 since 08/26/2021. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Applying the patch de5494af4815a4c9328536c72741229b7de88e7f is able to eliminate this problem. The bugfix is ready for download at github.com.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: de5494af4815a4c9328536c72741229b7de88e7f

Timelineinfo

08/26/2021 🔍
08/24/2022 +363 days 🔍
08/24/2022 +0 days 🔍
09/25/2022 +32 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: de5494af4815a4c9328536c72741229b7de88e7f
Status: Confirmed

CVE: CVE-2021-3736 (🔍)
GCVE (CVE): GCVE-0-2021-3736
GCVE (VulDB): GCVE-100-207027

Entryinfo

Created: 08/24/2022 07:50
Updated: 09/25/2022 08:08
Changes: 08/24/2022 07:50 (43), 09/25/2022 08:02 (1), 09/25/2022 08:08 (11)
Complete: 🔍
Cache ID: 216::103

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