SB20260727371 - Improper input validation in Linux kernel rxrpc
Published: July 27, 2026
Security Bulletin ID
SB20260727371
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-2026-64208)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 8.7 [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]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in the AF_RXRPC RxGK packet handling and crypto/krb5 length-check logic when processing secured DATA packets. A remote attacker can send a specially crafted short packet to cause a denial of service.
Remediation
Install update from vendor's website.