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 resource consumption vulnerability. The CWE definition for the vulnerability is 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. 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).

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

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3

License

• open-source

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