Ubuntu alert USN-7997-1 (openjdk-17-crac)

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noreply+usn-bot@canonical.com
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ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-7997-1] CRaC JDK 17 vulnerabilities
Date:
             
 
Tue, 03 Feb 2026 12:14:35 +0000
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<E1vnFIh-0007Z7-Kc@lists.ubuntu.com>
==========================================================================
Ubuntu Security Notice USN-7997-1
February 02, 2026

openjdk-17-crac vulnerabilities
==========================================================================

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

- Ubuntu 25.10

Summary:

Several security issues were fixed in CRaC JDK 17.

Software Description:
- openjdk-17-crac: Open Source Java implementation with Coordinated Restore at Checkpoints

Details:

It was discovered that the RMI component of CRaC JDK 17 would establish
RMI TCP endpoint connections to a remote host without setting an
endpoint identification algorithm. An unauthenticated remote attacker
could possibly use this issue to steal sensitive information.
(CVE-2026-21925)

Mingijung discovered that the AWT and JavaFX componenets of CRaC JDK 17
could run programs if Desktop.browse() was supplied a filename as a
URI. An unauthenticated remote attacker could possibly use this issue
to execute arbitrary code. (CVE-2026-21932)

Zhihui Chen discovered that the Networking component of CRaC JDK 17
was suceptible to a CRLF injection vulnerability via the HttpServer
class. An unauthenticated remote attacker could possibly use this
issue to modify files or leak sensitive information. (CVE-2026-21933)

Ireneusz Pastusiak discovered that the Security component of CRaC JDK
17 failed to verify provided URIs point to a legitimate source when
AIA is enabled. An unauthenticated remote attacker could possibly
use this issue to redirect users to malicious hosts.
(CVE-2026-21945)

In addition to security fixes, the updated packages contain bug fixes,
new features, and possibly incompatible changes.

Please see the following for more information:
https://openjdk.org/groups/vulnerability/advisories/2026-...

Update instructions:

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

Ubuntu 25.10
  openjdk-17-crac-jdk             17.0.18+8-0ubuntu1~25.10
  openjdk-17-crac-jdk-headless    17.0.18+8-0ubuntu1~25.10
  openjdk-17-crac-jre             17.0.18+8-0ubuntu1~25.10
  openjdk-17-crac-jre-headless    17.0.18+8-0ubuntu1~25.10
  openjdk-17-crac-jre-zero        17.0.18+8-0ubuntu1~25.10

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart Java
applications to make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-7997-1
  CVE-2026-21925, CVE-2026-21932, CVE-2026-21933, CVE-2026-21945

Package Information:
  https://launchpad.net/ubuntu/+source/openjdk-17-crac/17.0...


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