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AWS Security Bulletins

Dirty Frag and other issues in Amazon Linux kernels

Bulletin ID: 2026-027-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 2026/05/07 19:45 PM PDT Description: Amazon is aware of a class of issues in the Linux kernel related to the original issue (CVE-2026-31431). The issues commonly referred to as "DirtyFrag" are present in a number of loadable modules, including xfrm_user/esp4/esp6 and ipcomp4/ipcomp6. On systems that allow unprivileged users to create sockets directly or through CAP_NET_ADMIN, or allow the creation of unprivileged user namespaces (user+net), an actor may gain access to kernel memory and thus escalate their privileges. Please refer to the article below for the most up-to-date and complete information related to this AWS Security Bulletin.

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Scope

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Vulnerabilities

CVEs named in this advisory

CVE-2026-31431View CVSS, KEV, EPSS, and threat context
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