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Ubuntu 25.04 Security Advisory USN-7635-1 Critical GnuTLS DoS Issue

ubuntu
Calendar Grey July 14, 2025
Dist Ubuntu Esm H88
Multiple GnuTLS vulnerabilities addressed in Ubuntu through essential updates required for safeguarding the system.
Several security issues were fixed in GnuTLS.

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. (CVE-2025-32988)

It was discovered that GnuTLS incorrectly handled parsing the Certificate

Transparency (CT) Signed Certificate Timestamp (SCT) extension. A remote

attacker could use this issue to cause GnuTLS to crash, resulting in a

denial of service, or possibly obtain sensitive information.

(CVE-2025-32989)

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 parsin...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical remote attack Ubuntu gnutls

Update Instructions

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

Ubuntu 25.04
  libgnutls30t64                  3.8.9-2ubuntu3.1

Ubuntu 24.04 LTS
  libgnutls30t64                  3.8.3-1.1ubuntu3.4

Ubuntu 22.04 LTS
  libgnutls30                     3.7.3-4ubuntu1.7

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

References

https://ubuntu.com/security/notices/USN-7635-1

CVE-2025-32988, CVE-2025-32989, CVE-2025-32990, CVE-2025-6395

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7635-1

Topics%20covered

Topics Covered

security advisory denial of service critical remote attack Ubuntu gnutls

Package Information

https://launchpad.net/ubuntu/+source/gnutls28/3.8.9-2ubuntu3.1
https://launchpad.net/ubuntu/+source/gnutls28/3.8.3-1.1ubuntu3.4
https://launchpad.net/ubuntu/+source/gnutls28/3.7.3-4ubuntu1.7

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