Linux Kernel up to 6.0.8 CAN Interface can_priv out-of-bounds

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.0.8. It has been rated as problematic. Impacted is the function can_priv of the component CAN Interface. The manipulation leads to out-of-bounds. This vulnerability is documented as CVE-2022-49844. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.0.8. It has been rated as problematic. This issue affects the function can_priv of the component CAN Interface. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: can: dev: fix skb drop check In commit a6d190f8c767 ("can: skb: drop tx skb if in listen only mode") the priv->ctrlmode element is read even on virtual CAN interfaces that do not create the struct can_priv at startup. This out-of-bounds read may lead to CAN frame drops for virtual CAN interfaces like vcan and vxcan. This patch mainly reverts the original commit and adds a new helper for CAN interface drivers that provide the required information in struct can_priv. [mkl: patch pch_can, too]

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2022-49844 since 05/01/2025. The exploitation is known to be easy. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 247760 (Linux Distros Unpatched Vulnerability : CVE-2022-49844), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.0.9 eliminates this vulnerability. Applying the patch 386c49fe31ee748e053860b3bac7794a933ac9ac/ae64438be1923e3c1102d90fd41db7afcfaf54cc is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (247760). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.0.0
• 6.0.1
• 6.0.2
• 6.0.3
• 6.0.4
• 6.0.5
• 6.0.6
• 6.0.7
• 6.0.8

License

• open-source

Website

• Vendor: https://www.kernel.org/

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