Linux Kernel up to 4.8.10 Performance Monitor sys_regs.c access_pmu_evcntr input validation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.5$0-$5k0.00

A vulnerability classified as problematic was found in Linux Kernel up to 4.8.10 (Operating System). This vulnerability affects the function access_pmu_evcntr of the file arch/arm64/kvm/sys_regs.c of the component Performance Monitor. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. CVE summarizes:

The access_pmu_evcntr function in arch/arm64/kvm/sys_regs.c in the Linux kernel before 4.8.11 allows privileged KVM guest OS users to cause a denial of service (assertion failure and host OS crash) by accessing the Performance Monitors Cycle Count Register (PMCCNTR).

The bug was discovered 09/19/2017. The weakness was released 09/20/2017 as confirmed git commit (GIT Repository). The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2017-12168 since 08/01/2017. The exploitation appears to be easy. The attack needs to be approached locally. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available.

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k.

Upgrading to version 4.8.11 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be patching the affected component.

Entries connected to this vulnerability are available at VDB-81717, VDB-103402, VDB-108193 and VDB-125588.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.5

VulDB Base Score: 3.2
VulDB Temp Score: 3.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.0
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Local: Yes
Remote: No

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: 🔍

Upgrade: Kernel 4.8.11
Patch: git.kernel.org

Timelineinfo

08/01/2017 🔍
09/19/2017 +49 days 🔍
09/20/2017 +1 days 🔍
09/20/2017 +0 days 🔍
09/20/2017 +0 days 🔍
12/29/2022 +1926 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 9e3f7a29694049edd728e2400ab57ad7553e5aa9
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-12168 (🔍)
See also: 🔍

Entryinfo

Created: 09/20/2017 11:17 PM
Updated: 12/29/2022 02:31 PM
Changes: 09/20/2017 11:17 PM (64), 11/18/2019 07:39 AM (2), 12/29/2022 02:31 PM (4)
Complete: 🔍
Cache ID: 98:158:40

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