SB2026042587 - Improper input validation in Linux kernel rxrpc
Published: April 25, 2026 Updated: May 22, 2026
Security Bulletin ID
SB2026042587
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper input validation (CVE-ID: CVE-2026-31635)
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:P/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in rxgk_verify_response() when processing RESPONSE packets. A remote attacker can send a specially crafted packet with an oversized authenticator length to cause a denial of service.
Remediation
Install update from vendor's website.