Linux Kernel up to 5.18.14 dsa_port_reset_vlan_filtering null pointer dereference

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 5.18.14. This affects the function dsa_port_reset_vlan_filtering. Performing a manipulation results in null pointer dereference. This vulnerability is cataloged as CVE-2022-49582. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Linux Kernel up to 5.18.14. This affects the function dsa_port_reset_vlan_filtering. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: net: dsa: fix NULL pointer dereference in dsa_port_reset_vlan_filtering The "ds" iterator variable used in dsa_port_reset_vlan_filtering() -> dsa_switch_for_each_port() overwrites the "dp" received as argument, which is later used to call dsa_port_vlan_filtering() proper. As a result, switches which do enter that code path (the ones with vlan_filtering_is_global=true) will dereference an invalid dp in dsa_port_reset_vlan_filtering() after leaving a VLAN-aware bridge. Use a dedicated "other_dp" iterator variable to avoid this from happening.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2022-49582 since 02/26/2025. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 246640 (Linux Distros Unpatched Vulnerability : CVE-2022-49582), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.18.15 eliminates this vulnerability. Applying the patch 3240e12fe203a3a79b9814e83327106b770ed7b0/1699b4d502eda3c7ea4070debad3ee570b5091b1 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 (246640). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.18.0
• 5.18.1
• 5.18.2
• 5.18.3
• 5.18.4
• 5.18.5
• 5.18.6
• 5.18.7
• 5.18.8
• 5.18.9
• 5.18.10
• 5.18.11
• 5.18.12
• 5.18.13
• 5.18.14

License

• open-source

Website

• Vendor: https://www.kernel.org/

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If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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