CVE-2026-53003

pppoe: drop PFC frames

HIGH 7.5

En bref

Source
NVD
EPSS
EPSS 0.72 % · centile 54 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

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 shifted by one byte. This causes the network header to be 4-byte misaligned, which may trigger unaligned access exceptions on some architectures. To reduce the attack surface, drop PPPoE PFC frames. Introduce ppp_skb_is_compressed_proto() helper function to be used in both ppp_generic.c and pppoe.c to avoid open-coding.

Faiblesses (CWE)

  • CWE-20 — Validation d'entrée incorrecte

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLinux
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < cb3beef35ab5e0c1afca9fd7648c6ae499786377 ; affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < ba758fdf1399f310b30098b6faa3fd043de47dd2 ; affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < fcca1df05322bb04e344dd1178b54b76a08eb7c3 ; affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < 8a5e840babc5c0fbd10c73728a13192347771ec6 ; affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < 49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71 ; affected 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6 < 0cab5d077dd1efd2bd1a47271acc35894f945b4f
Linux · Linuxaffected 5.0 ; unaffected 0 < 5.0 ; unaffected 5.10.258 ≤ 5.10.* ; unaffected 5.15.209 ≤ 5.15.* ; unaffected 6.1.175 ≤ 6.1.* ; unaffected 6.6.141 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD