Linux Kernel Shared Memory Page resource consumption

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel. The impacted element is an unknown function of the component Shared Memory Page Handler. This manipulation causes resource consumption. The identification of this vulnerability is CVE-2021-3669. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel (Operating System) (the affected version is unknown). Affected by this vulnerability is an unknown code of the component Shared Memory Page 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. The summary by CVE is:

A flaw was found in the Linux kernel. Measuring usage of the shared memory does not scale with large shared memory segment counts which could lead to resource exhaustion and DoS.

The weakness was shared 08/26/2022. It is possible to read the advisory at access.redhat.com. This vulnerability is known as CVE-2021-3669 since 07/29/2021. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/05/2025). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 208245 (Debian dla-3912 : ata-modules-5.10.0-29-armmp-di - security update), which helps to determine the existence of the flaw in a target environment.

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 Tenable (208245). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

License

• open-source

Website

• Vendor: https://www.kernel.org/

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

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