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Off By !: Exploiting a Use-after-Free in the Linux Kernel

Oliver Sieber published a write-up about CVE-2026-23111 in nftables, which they found in early 2025 and other researchers patched upstream in February 2026. The article describes exploiting this UAF on Debian and Ubuntu.
Exodus Intelligence Off By !: Exploiting a Use-after-Free in the Linux Kernel - Exodus Intelligence By Oliver Sieber Overview In this blog post, we discuss a use-after-free vulnerability that we found in the nftables subsystem of the Linux kernel in early 2025. This vulnerability was patched upstream on 5 February 2026 and assigned CVE-2026-23111. This…
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