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Ubuntu 25.10 : CRaC JDK 21 vulnerabilities (USN-8003-1)

medium Nessus Plugin ID 297656

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Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 25.10 host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8003-1 advisory.

 It was discovered that the RMI component of CRaC JDK 21 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 21 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 21 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 21 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/2026-01-20

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8003-1

Plugin Details

Severity: Medium

ID: 297656

File Name: ubuntu_USN-8003-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2/3/2026

Updated: 2/3/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2026-21932

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-21925

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac-jre, cpe:/o:canonical:ubuntu_linux:25.10, p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac-jre-zero, p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac-demo, p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac-jdk-headless, p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac-source, p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac-jdk, p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac-jre-headless, p-cpe:/a:canonical:ubuntu_linux:openjdk-21-crac-testsupport

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/2/2026

Vulnerability Publication Date: 1/20/2026

Reference Information

CVE: CVE-2026-21925, CVE-2026-21932, CVE-2026-21933, CVE-2026-21945

USN: 8003-1