About Elevation of Privilege vulnerability - Linux Kernel "Dirty Frag" (CVE-2026-43284, CVE-2026-43500) vulnerability. According to information from researcher Hyunwoo Kim (@v4bel), Dirty Frag is a vulnerability (a class of vulnerabilities) that allows a local unprivileged attacker to obtain root privileges on most Linux distributions by combining the xfrm-ESP Page-Cache Write vulnerability (CVE-2026-43284) and the RxRPC Page-Cache Write vulnerability (CVE-2026-43500).

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As the researcher reports, the xfrm-ESP Page-Cache Write vulnerability in the Dirty Frag chain shares the same sink as Copy Fail. However, it is triggered regardless of whether the algif_aead module is available. Even on systems where the publicly known Copy Fail mitigation is applied, Linux remains vulnerable to Dirty Frag.

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