CVE-2025-9820 — Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function

Affected: gnutls, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat RHEL-8 based Middleware Containers, Red Hat Ceph Storage 8, Red Hat Discovery 2, Red Hat Hardened Images, Red Hat Insights proxy 1.5, Red Hat Update Infrastructure 5 and 4 more

A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.

USN-8043-1 — gnutls28 vulnerabilities

Affected: Ubuntu:22.04:LTS: gnutls28, Ubuntu:24.04:LTS: gnutls28, Ubuntu:25.10: gnutls28

Tim Scheckenbach discovered that GnuTLS incorrectly handled malicious certificates containing a large number of name constraints and subject alternative names. A remote attacker could possibly use this issue to cause GnuTLS to consume resources, resulting in a denial of service. (CVE-2025-14831)

Luigino Camastra discovered that GnuTLS incorrectly handled certain PKCS11 token labels. A remote attacker could use this issue to cause GnuTLS to crash, resulting in a denial of service, or possibly execute arbitrary code. The default compiler options for affected releases should reduce the vulnerability to a denial of service. (CVE-2025-9820)

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CVE-2025-9820 — Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function

USN-8043-1 — gnutls28 vulnerabilities