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Published: 2026-03-27 Description Description Severity Notes A vulnerability was discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes. What should I do? We recommend upgrading your Container-Optimized OS (COS) node to cos-125-19216-220-57 , which includes a fix for this vulnerability. For upgrade instructions, see one of the following: If you manage Container-Optimized OS VMs directly, then you should recreate your VMs by using the updated images. For more information, see Creating a VM from a public image . If you use Container-Optimized OS through a managed service (such as GKE, Dataflow, or Cloud SQL), then refer to the specific upgrade instructions for that service. Note: Fixes are in progress for Container-Optimized OS milestones 117 and 121. What vulnerabilities are being addressed? The CrackArmor vulnerability in AppArmor, CVE-2026-23268, allows unprivileged users to bypass kernel protections, escalate to root, and break local container isolation. High CVE-2026-23268

CVE-2026-23268 is a vulnerability in the Linux kernel's AppArmor Linux Security Module (LSM) that permits an unprivileged local attacker to load, replace, and remove AppArmor profiles by exploiting a confused deputy attack. The attacker opens the apparmorfs interface and passes the file descriptor to a privileged process, which then performs writes on the attacker's behalf. This requires a privileged target process that can be manipulated to write to the interface. Successful exploitation grants full policy management capabilities, enabling actions such as removing confinement, causing denial of service by denying execution, bypassing unprivileged user namespace restrictions, or exploiting kernel bugs for local privilege escalation. The vulnerability cannot be mitigated by simply changing file permissions due to legitimate non-root policy loading needs. Multiple versions of the linux-azure kernel are affected. Ubuntu has released patches addressing this issue in their linux-raspi and linux-oem kernel packages. The vulnerability has a CVSS v3.1 score of 7.8 (high severity).

Detailed information about UBUNTU-CVE-2026-23268 affecting null linux-azure. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-23268 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux azure: In the Linux kernel, the following vulnerability has been resolved: apparmor: fix unprivileged local user can do privileged policy management An… (CVE-2026-23268)

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