VLAN Protocol Helper Vulnerability in Linux Kernel

CVE-2023-53433

What is CVE-2023-53433?

A vulnerability has been identified in the Linux kernel that involves improper handling of VLAN protocol data. The issue arises from the misleading use of the pskb_may_pull() function instead of the appropriate skb_header_pointer(). This oversight has potential implications for network packet processing, particularly for users relying on the skb structure for data manipulation. The introduction of the vlan_get_protocol_and_depth() helper function clarifies the intent and addresses the reliance on the readiness of the MAC header, thus enhancing network security. The vulnerability was detected by syzbot, highlighting vulnerabilities that could lead to unexpected behavior in packet transmission and processing.

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