CVE-2026-53003

Vulnerability overview

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 uncompressed (2-byte) protocol field. However, the generic PPP layer function ppp_input() is not aware of the negotiation result, and still accepts PFC frames. If a peer with a broken implementation or an attacker sends a frame with a compressed (1-byte) protocol field, the subsequent PPP payload is...

Affected product and versions

Product

Linux Linux, linux kernel

Affected versions

>= 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < cb3beef35ab5e0c1afca9fd7648c6ae499786377, >= 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < ba758fdf1399f310b30098b6faa3fd043de47dd2, >= 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < fcca1df05322bb04e344dd1178b54b76a08eb7c3, >= 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < 8a5e840babc5c0fbd10c73728a13192347771ec6, >= 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < 49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71, >= 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < 0cab5d077dd1efd2bd1a47271acc35894f945b4f, >= 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < 2b5c3c040d020e3ab3b9a8887031202d96843b1e, >= 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < cc1ff87bce1ccd38410ab10960f576dcd17db679, >= 5.0, >= 5.0 < 5.10.258, >= 5.11 < 5.15.209, >= 5.16 < 6.1.175, >= 6.2 < 6.6.141, >= 6.7 < 6.12.91, >= 6.13 < 6.18.33, >= 6.19 < 7.0.10

Fixed versions

5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, 7.0.10

Technical data

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

Not available