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Mageia 9 krb5 Important Message Integrity Issues 2026-0233

mageia
Calendar Grey June 27, 2026
Dist Mageia Esm H88
Multiple vulnerabilities in MIT Kerberos, including message tampering and remote crashes, threaten Mageia 9 systems.
Security update

Summary

Description: CVE-2025-3576, A vulnerability in the MIT Kerberos implementation allows GSSAPI-protected messages using RC4-HMAC-MD5 to be spoofed due to weaknesses in the MD5 checksum design. If RC4 is preferred over stronger encryption types, an attacker could exploit MD5 collisions to forge message integrity codes. This may lead to unauthorized message tampering. CVE-2026-40355, there is a NULL pointer dereference if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, causing the process to terminate in parse_nego_message. CVE-2026-40356, there is an integer underflow and resultant out-of-bounds read if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, possibly causing the process to terminate in parse_message.

References

- https://bugs.mageia.org/show_bug.cgi?id=34335

- https://ubuntu.com/security/notices/USN-7542-1

- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WUGJTUM4NLGGJ3R7BZDYAOOYNXCNHUIE/

- https://www.openwall.com/lists/oss-security/2026/04/27/8

- https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html

- https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/message/CGQDIGY7A2NYHA7RFMRH6ORESGTIUR7C/

- https://www.cve.org/CVERecord?id=CVE-2025-3576

- https://www.cve.org/CVERecord?id=CVE-2026-40355

- https://www.cve.org/CVERecord?id=CVE-2026-40356

Topics%20covered

Topics Covered

security advisory important crash network vulnerabilities Mageia message tampering

Resolution

SRPMS

- 9/core/krb5-1.20.1-1.5.mga9

Severity
important
Lowest
Low
Medium
High
Critical

Publication date: 27 Jun 2026
URL: https://advisories.mageia.org/MGASA-2026-0233.html
Type: security
CVE: CVE-2025-3576, CVE-2026-40355, CVE-2026-40356

Topics%20covered

Topics Covered

security advisory important crash network vulnerabilities Mageia message tampering

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