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[USN-7742-1] GnuTLS vulnerabilities

Posted on 10 September 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7742-1
September 09, 2025

gnutls28 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in GnuTLS.

Software Description:
- gnutls28: GNU TLS library

Details:

It was discovered that GnuTLS incorrectly handled exporting Subject
Alternative Name (SAN) entries containing an otherName. A remote attacker
could use this issue to cause GnuTLS to crash, resulting in a denial of
service, or possibly execute arbitrary code. This issue only affected
Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2025-32988)

It was discovered that the GnuTLS certtool utility incorrectly handled
parsing certain template files. An attacker could use this issue to cause
GnuTLS to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2025-32990)

Stefan Bühler discovered that GnuTLS incorrectly handled parsing certain
template files. An attacker could possibly use this issue to cause GnuTLS
to crash, resulting in a denial of service. This issue only affected
Ubuntu 20.04 LTS. (CVE-2025-6395)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.04 LTS
libgnutls30 3.6.13-2ubuntu1.12+esm1
Available with Ubuntu Pro

Ubuntu 18.04 LTS
libgnutls30 3.5.18-1ubuntu1.6+esm2
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libgnutls30 3.4.10-4ubuntu1.9+esm2
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7742-1
CVE-2025-32988, CVE-2025-32990, CVE-2025-6395

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