CVE-2025-68362

/// Technical description

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

wifi: rtl818x: rtl8187: Fix potential buffer underflow in rtl8187_rx_cb()

The rtl8187_rx_cb() calculates the rx descriptor header address

by subtracting its size from the skb tail pointer.

However, it does not validate if the received packet

(skb->len from urb->actual_length) is large enough to contain this

header.

If a truncated packet is received, this will lead to a buffer

underflow, reading memory before the start of the skb data area,

and causing a kernel panic.

Add length checks for both rtl8187 and rtl8187b descriptor headers

before attempting to access them, dropping the packet cleanly if the

check fails.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References