Linux Kernel up to 5.5.3 Journal Size fs/ext4/block_validity.c resource consumption

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CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.4$0-$5k0.00

A vulnerability classified as problematic was found in Linux Kernel up to 5.5.3 (Operating System). This vulnerability affects an unknown part of the file fs/ext4/block_validity.c of the component Journal Size Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-400. As an impact it is known to affect availability. CVE summarizes:

ext4_protect_reserved_inode in fs/ext4/block_validity.c in the Linux kernel through 5.5.3 allows attackers to cause a denial of service (soft lockup) via a crafted journal size.

The weakness was disclosed 02/14/2020. This vulnerability was named CVE-2020-8992 since 02/14/2020. The exploitation appears to be easy. Local access is required to approach this attack. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 02/14/2020). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

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

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VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.4

VulDB Base Score: 3.3
VulDB Temp Score: 3.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
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Exploitinginfoedit

Class: Denial of service
CWE: CWE-400
ATT&CK: T1499

Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

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Current Price Estimation: 🔍

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Recommended: no mitigation known
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Timelineinfoedit

02/14/2020 🔍
02/14/2020 +0 days 🔍
02/14/2020 +0 days 🔍
02/14/2020 +0 days 🔍

Sourcesinfoedit

Vendor: https://www.kernel.org/

Status: Not defined

CVE: CVE-2020-8992 (🔍)

Entryinfoedit

Created: 02/14/2020 09:55 AM
Changes: (18) software_type vulnerability_cwe vulnerability_cvss2_nvd_av vulnerability_cvss2_nvd_ac vulnerability_cvss2_nvd_au vulnerability_cvss2_nvd_ci vulnerability_cvss2_nvd_ii vulnerability_cvss2_nvd_ai vulnerability_cvss3_nvd_av vulnerability_cvss3_nvd_ac vulnerability_cvss3_nvd_pr vulnerability_cvss3_nvd_ui vulnerability_cvss3_nvd_s vulnerability_cvss3_nvd_c vulnerability_cvss3_nvd_i vulnerability_cvss3_nvd_a source_cve_assigned source_cve_nvd_summary
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