CVE-2026-53003 pppoe: drop PFC frames

In the Linux kernel, the following vulnerability has been resolved: pppoe: drop PFC frames RFC 2516 Section 7 states that Protocol Field Compression PFC is NOT RECOMMENDED for PPPoE. In practice, pppd does not support negotiating PFC for PPPoE sessions, and the current PPPoE driver assumes an...

CVE-2026-53003

The CVE-2026-53003 issue affects the Linux kernel PPPoE stack. A misbehaving peer can send a compressed Protocol Field (PFC) frame, causing the PPP payload to shift by one byte and creating a 4-byte misalignment in the network header, which may trigger unaligned access exceptions on some architec...