CVE-2025-24528: 
Kerberos vulnerability analysis and mitigation

CVE-2025-24528 is a security vulnerability discovered in MIT krb5 release 1.7 and later versions. The flaw affects the Kerberos authentication system when incremental propagation is enabled. The vulnerability was disclosed in January 2025 and affects multiple versions of the krb5 package across various Linux distributions (Ubuntu Security, Red Hat Portal).

The vulnerability occurs in the kadmind service when incremental propagation is enabled. The issue specifically involves an overflow condition when calculating the ulog block size, which can lead to writing beyond the end of the mapped region for the iprop log file. The vulnerability has been assigned a Moderate severity rating by Red Hat, indicating a significant but not critical security impact (Red Hat Advisory).

When successfully exploited, this vulnerability allows an authenticated attacker to cause the kadmind service to write beyond the end of the mapped region for the iprop log file. The primary impact is likely to result in a process crash, potentially affecting the availability of the Kerberos authentication service (Debian LTS).

A fix has been released and is available through various distribution channels. Debian has addressed the issue in version 1.18.3-6+deb11u6 for Debian 11 (Bullseye). Red Hat has released updated packages for affected versions of Red Hat Enterprise Linux. Users are recommended to upgrade their krb5 packages to the latest available versions (Debian LTS, Red Hat Advisory).