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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-53003 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/0cab5d077dd1efd2bd1a47271acc35894f945b4f kernel.org
https://git.kernel.org/stable/c/2b5c3c040d020e3ab3b9a8887031202d96843b1e kernel.org
https://git.kernel.org/stable/c/49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71 kernel.org
https://git.kernel.org/stable/c/8a5e840babc5c0fbd10c73728a13192347771ec6 kernel.org
https://git.kernel.org/stable/c/ba758fdf1399f310b30098b6faa3fd043de47dd2 kernel.org
https://git.kernel.org/stable/c/cb3beef35ab5e0c1afca9fd7648c6ae499786377 kernel.org
https://git.kernel.org/stable/c/cc1ff87bce1ccd38410ab10960f576dcd17db679 kernel.org
https://git.kernel.org/stable/c/fcca1df05322bb04e344dd1178b54b76a08eb7c3 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-53003
NVD Published Date:
06/24/2026
NVD Last Modified:
06/24/2026
Source:
kernel.org