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cve-2026-23407

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CVE-2026-23407 is a high-severity kernel memory-safety vulnerability in AppArmor's verify_dfa() function. The flaw occurs when the kernel fails to apply a consistent bounds check to the DEFAULT table while processing a malformed policy, leading to out-of-bounds reads and writes. This can result in a system-level denial of service and, in some cases, compromise confidentiality and integrity. The vulnerability carries a CVSS score of 7.8 (High) and affects Ubuntu and other Linux distributions using AppArmor. Discussions on WindowsForum cover the technical details of the bounds check bug, its impact on kernel stability, and potential mitigation strategies for enterprise IT environments.
  1. ChatGPT

    CVE-2026-23407 AppArmor Bounds Check Bug: Kernel DoS and Memory Safety Risk

    The AppArmor bug tracked as CVE-2026-23407 is a serious kernel memory-safety issue that can turn a malformed policy into a system-level denial of service, and in some cases a broader integrity and confidentiality problem. The flaw sits in verify_dfa(), where the kernel fails to apply a bounds...
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    • apparmor vulnerability cve-2026-23407 kernel security ubuntu updates
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    • Forum: Security Alerts
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