CVE-2023-53125

In the Linux kernel, the following vulnerability has been resolved:

net: usb: smsc75xx: Limit packet length to skb->len

Packet length retrieved from skb data may be larger than the actual socket buffer length (up to 9026 bytes). In such case the cloned skb passed up the network stack will leak kernel memory contents.

The vulnerability in SMSC LAN75XX based USB 2.0 gigabit ethernet devices driver arises because the driver fails to properly validate packet length fields when receiving network frames. Specifically, the code used size values that could exceed the actual skb->len, leading to a situation where kernel memory beyond the buffer is copied into the outgoing skb. If the driver is active, a remote attacker on the same network can send oversized Ethernet frames to trigger this bug, resulting in leakage of uninitialized kernel memory (CIA: HNN, Confidentiality: High).

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

To mitigate this issue, prevent module smsc75xx from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.