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Alerts This Week
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Ubuntu 25.10 Policykit Important Denial of Service Issues USN-8173-1

ubuntu
Calendar Grey April 14, 2026
Dist Ubuntu Esm H88
Multiple security fixes for policykit-1 in Ubuntu to address denial of service concerns. Update necessary for system integrity.
Several security issues were fixed in polkit.

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)

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important xml parsing policykit-1

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8173-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important xml parsing policykit-1

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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