SB20260502148 - Improper input validation in Linux kernel rxrpc

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Main Vulnerability Database SB20260502148

SB20260502148 - Improper input validation in Linux kernel rxrpc

Published: May 2, 2026

Security Bulletin ID SB20260502148
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-31696)

CWE-ID: CWE-20 - Improper input validation

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


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper input validation in rxrpc_preparse() when parsing non-XDR key payloads. A local user can provide a crafted key payload with an oversized ticket length to cause a denial of service.

The issue is triggered later when the key is read via rxrpc_read(), causing the token size calculation to exceed AFSTOKEN_LENGTH_MAX and hit a WARN_ON().


Remediation

Install update from vendor's website.

References