● Ubuntu USN · September 2026

Ubuntu Linux Security Advisory: September 2026 Kernel & Subsystem Triage

Triage of Ubuntu's September 2026 kernel rollups addressing critical io_uring memory corruption, eBPF verifier bounds, and network packet handling vulnerabilities.

Kernel CVEs Fixed

In-The-Wild Exploit

7.8

CVSS io_uring Flaw

High

Server Patch Urgency

Triage Exécutif et Verdict de Risque

Canonical released coordinated Ubuntu Security Notices (USN) across 24.04 LTS and 22.04 LTS addressing 34 kernel security issues. The critical highlight is CVE-2024-0582 in the io_uring subsystem, an actively targeted use-after-free flaw that allows unprivileged local attackers to elevate privileges to root.

Matrice de Triage des Vulnérabilités

Identifiant CVE	Sous-système / Composant	Impact	CVSS	Exploitation Active ?
CVE-2024-0582	io_uring / Ring Buffer	Use-After-Free / LPE	7.8 High	YES (In-The-Wild)
CVE-2024-41090	eBPF Verifier	Bounds Check Bypass	7.1 High	No
CVE-2024-41091	Bluetooth L2CAP	Null Pointer Dereference	6.5 Medium	No
CVE-2024-41092	Ext4 Filesystem	Out-of-Bounds Read	5.5 Medium	No

ANALYSE DE CODE DÉTAILLÉE

Deep Dive: Linux Kernel io_uring Privilege Escalation Teardown →

Inspect the exact C diff from fs/io_uring.c showing how registering an existing ring buffer caused a premature reference drop and slab-use-after-free.

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