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.
References
Configurations
Configuration 1 (hide)
|
History
14 Jul 2026, 20:05
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | NVD-CWE-noinfo | |
| References | () https://git.kernel.org/stable/c/0cab5d077dd1efd2bd1a47271acc35894f945b4f - Patch | |
| References | () https://git.kernel.org/stable/c/2b5c3c040d020e3ab3b9a8887031202d96843b1e - Patch | |
| References | () https://git.kernel.org/stable/c/49e41b60ccd1bdbe9e218420f716dd5f9a2f9c71 - Patch | |
| References | () https://git.kernel.org/stable/c/8a5e840babc5c0fbd10c73728a13192347771ec6 - Patch | |
| References | () https://git.kernel.org/stable/c/ba758fdf1399f310b30098b6faa3fd043de47dd2 - Patch | |
| References | () https://git.kernel.org/stable/c/cb3beef35ab5e0c1afca9fd7648c6ae499786377 - Patch | |
| References | () https://git.kernel.org/stable/c/cc1ff87bce1ccd38410ab10960f576dcd17db679 - Patch | |
| References | () https://git.kernel.org/stable/c/fcca1df05322bb04e344dd1178b54b76a08eb7c3 - Patch | |
| CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| First Time |
Linux linux Kernel
Linux |
28 Jun 2026, 08:16
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
24 Jun 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-06-24 17:17
Updated : 2026-07-14 20:05
NVD link : CVE-2026-53003
Mitre link : CVE-2026-53003
CVE.ORG link : CVE-2026-53003
JSON object : View
Products Affected
linux
- linux_kernel
CWE