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DirtyAH6 is a Linux kernel XFRM/AHv6 vulnerability in routing-header processing. Before calculating or verifying an AH integrity check value, AH6 rearranges IPv6 Routing Header addresses through ipv6_rearrange_rthdr(). The function assumed that segments_left did not exceed the number of addresses encoded by the header-length field. That invariant is not enforced for raw IPv6 HDRINCL packets. A crafted routing header can declare one address while supplying a much larger segments_left value, causing address-pointer arithmetic to move before the routing-header address area and an oversized memmove() operation to access memory out of bounds. The upstream correction validates segments_left before modifying the header or calculating address pointers, and returns malformed-header errors through the existing AH6 input and output error paths.
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A Linux local privilege-escalation (local root) vulnerability referred to as DirtyAH6.
A vulnerability addressed by the referenced Oracle Linux security update; no technical vulnerability details are provided.
A vulnerability referenced by the Oracle Linux ELSA-2026-500330 update for affected Oracle Linux kernel-uek packages. No technical vulnerability details or CVSS score are provided in the content.
An out-of-bounds memory-access vulnerability in the Linux kernel XFRM AH6 processing path. Malformed raw IPv6 HDRINCL routing headers can provide a segments_left value larger than the number of addresses denoted by hdrlen, causing unsafe pointer arithmetic and an oversized memmove() operation.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.