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UBUNTU SECURITY NOTICECANONICALVERIFIED

PUBLISHER UPDATE · USN-8850-1

USN-8850-1 release notes and known issues

USN-8850-1: Linux kernel (BlueField) vulnerabilities

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

Summary

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Network file system (NFS) server daemon; - OCFS2 file system; - IPv6 networking; - Netfilter; - SCTP protocol; (CVE-2025-38724, CVE-2026-53043, CVE-2026-53131, CVE-2026-53221, CVE-2026-53224, CVE-2026-53225, CVE-2026-53246, CVE-2026-53309)

Improvements and security content

  • Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Network file system (NFS) server daemon; - OCFS2 file system; - IPv6 networking; - Netfilter; - SCTP protocol; (CVE-2025-38724, CVE-2026-53043, CVE-2026-53131, CVE-2026-53221, CVE-2026-53224, CVE-2026-53225, CVE-2026-53246, CVE-2026-53309)

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-2025-38724Open CVE report →CVE-2026-53043Open CVE report →CVE-2026-53131Open CVE report →CVE-2026-53221Open CVE report →CVE-2026-53224Open CVE report →CVE-2026-53225Open CVE report →CVE-2026-53246Open CVE report →CVE-2026-53309Open 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-8850-1: Linux kernel (BlueField) vulnerabilities

Checked 30 Sep 2026. BlackTree preserves the last verified facts if a later source check is temporarily unavailable.

Open the official publisher source