7.5

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
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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6
Version < cb3beef35ab5e0c1afca9fd7648c6ae499786377
Status affected
Version 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6
Version < ba758fdf1399f310b30098b6faa3fd043de47dd2
Status affected
Version 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6
Version < fcca1df05322bb04e344dd1178b54b76a08eb7c3
Status affected
Version 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6
Version < 8a5e840babc5c0fbd10c73728a13192347771ec6
Status affected
Version 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6
Version < 49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71
Status affected
Version 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6
Version < 0cab5d077dd1efd2bd1a47271acc35894f945b4f
Status affected
Version 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6
Version < 2b5c3c040d020e3ab3b9a8887031202d96843b1e
Status affected
Version 7fb1b8ca8fa1ee34ffc328f17f78da68c7cc04e6
Version < cc1ff87bce1ccd38410ab10960f576dcd17db679
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 5.0
Status affected
Version 0
Version < 5.0
Status unaffected
Version <= 5.10.*
Version 5.10.258
Status unaffected
Version <= 5.15.*
Version 5.15.209
Status unaffected
Version <= 6.1.*
Version 6.1.175
Status unaffected
Version <= 6.6.*
Version 6.6.141
Status unaffected
Version <= 6.12.*
Version 6.12.91
Status unaffected
Version <= 6.18.*
Version 6.18.33
Status unaffected
Version <= 7.0.*
Version 7.0.10
Status unaffected
Version <= *
Version 7.1
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.51% 0.395
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
416baaa9-dc9f-4396-8d5f-8c081fb06d67 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Es wurden noch keine Informationen zu CWE veröffentlicht.
https://git.kernel.org/stable/c/cb3beef35ab5e0c1afca9fd7648c6ae499786377
https://git.kernel.org/stable/c/ba758fdf1399f310b30098b6faa3fd043de47dd2
https://git.kernel.org/stable/c/fcca1df05322bb04e344dd1178b54b76a08eb7c3
https://git.kernel.org/stable/c/8a5e840babc5c0fbd10c73728a13192347771ec6
https://git.kernel.org/stable/c/49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71
https://git.kernel.org/stable/c/0cab5d077dd1efd2bd1a47271acc35894f945b4f
https://git.kernel.org/stable/c/2b5c3c040d020e3ab3b9a8887031202d96843b1e
https://git.kernel.org/stable/c/cc1ff87bce1ccd38410ab10960f576dcd17db679