SB20260625174 - Improper input validation in Linux kernel PPPoE frame handling

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Main Vulnerability Database SB20260625174

SB20260625174 - Improper input validation in Linux kernel PPPoE frame handling

Published: June 25, 2026

Security Bulletin ID SB20260625174
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-53003)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper input validation in the PPPoE frame handling in the Linux kernel when processing PPPoE frames with a compressed protocol field. A remote attacker can send a specially crafted PPPoE frame to cause a denial of service.

The issue can trigger unaligned access exceptions on some architectures because the PPP payload becomes shifted by one byte and the network header becomes 4-byte misaligned.


Remediation

Install update from vendor's website.

References