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Fragnesia Local Privilege Escalation report via ESP-in-TCP in the Linux Kernel

Bulletin ID: 2026-029-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 05/13/2026 18:45 PM PDT This is an ongoing issue. Information is subject to change. Please refer to our Security Bulletin (ID: 2026-030-AWS) for the most updated patching information. Description: Amazon is aware of CVE-2026-46300, a report of an additional privilege escalation issue in the Linux kernel related to the DirtyFrag, copy.fail class of issues (CVE-2026-43284). The proof of concept uses a vector via the loadable module espintcp. Amazon Linux does not provide this module, and is not affected. As defense in depth we will include a correctness patch to the core networking code to harden against possible similar issues in network protocol implementations that rely on this behavior.

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Next step

What the vendor recommends

Please refer to our Security Bulletin (ID: 2026-030-AWS) for the most updated patching information.

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Vulnerabilities

CVEs named in this advisory

CVE-2026-46300View CVSS, KEV, EPSS, and threat contextCVE-2026-43284View CVSS, KEV, EPSS, and threat context
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