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[USN-8173-1] polkit vulnerabilities

Posted on 14 April 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8173-1
April 14, 2026

policykit-1 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in polkit.

Software Description:
- policykit-1: framework for managing administrative policies and privileges

Details:

It was discovered that polkit incorrectly handled nested elements in XML
policy files. If an administrator were tricked into installing a malicious
policy file, a remote attacker could possibly use this issue to cause
polkit to crash, resulting in a denial of service. (CVE-2025-7519)

Pavel Kohout discovered that the polkit polkit-agent-helper-1 utility
incorrectly handled long input. A local attacker could possibly use this
issue to cause polkit to crash, resulting in a denial of service.
(CVE-2026-4897)

Update instructions:

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

Ubuntu 25.10
polkitd 126-2ubuntu0.1

Ubuntu 24.04 LTS
policykit-1 124-2ubuntu1.24.04.3

Ubuntu 22.04 LTS
policykit-1 0.105-33ubuntu0.1

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

References:
https://ubuntu.com/security/notices/USN-8173-1
CVE-2025-7519, CVE-2026-4897

Package Information:
https://launchpad.net/ubuntu/+source/policykit-1/126-2ubuntu0.1
https://launchpad.net/ubuntu/+source/policykit-1/124-2ubuntu1.24.04.3
https://launchpad.net/ubuntu/+source/policykit-1/0.105-33ubuntu0.1

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