BlackTreeLifecycle intelligence
Evidence-linked product lifecycle intelligenceSUPPORT · SECURITY · RETIREMENT
← Lifecycle catalogue
UBUNTU SECURITY NOTICECANONICALVERIFIED

PUBLISHER UPDATE · USN-8852-1

USN-8852-1 release notes and known issues

USN-8852-1: OpenVPN vulnerabilities

Scope: Ubuntu. This update record adds version, fix and known-issue context. Its publication date is not a lifecycle boundary.

Summary

It was discovered that OpenVPN had a use-after-free vulnerability in its TLS session handling. An attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-84471) It was discovered that OpenVPN incorrectly handled retransmissions of ACK packet IDs, which could trigger a timeout integer overflow. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-84732)

Improvements and security content

  • It was discovered that OpenVPN had a use-after-free vulnerability in its TLS session handling. An attacker could possibly use this issue to cause OpenVPN to crash, resulting in a denial of service, or execute arbitrary code. (CVE-2026-84471) It was discovered that OpenVPN incorrectly handled retransmissions of ACK packet IDs, which could trigger a timeout integer overflow. A remote attacker could possibly use this issue to cause a denial of service. (CVE-2026-84732)

Known issues

Publisher statement

Not stated. The verified publisher record does not contain a known-issues statement.

Affected products and versions

Products

  • Ubuntu

Affected versions

  • See the official publisher source for applicability.

Fixed versions or updates

  • No fixed version is stated in this record.

Recommended action

Review the official publisher document before deployment.

Related vulnerabilities

BlackTree CVE Intelligence
CVE-2026-84471Open CVE report →CVE-2026-84732Open CVE report →

These links connect the publisher update to related Lifecycle records without treating the update publication date as an end-of-support date.

Ubuntu 24.04 LTSOpen lifecycle record →

Official publisher evidence

CANONICALVERIFIED

USN-8852-1: OpenVPN vulnerabilities

Checked 1 Oct 2026. BlackTree preserves the last verified facts if a later source check is temporarily unavailable.

Open the official publisher source