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CVE-2025-38166 is a Linux kernel vulnerability in the interaction between BPF sockmap and kernel TLS (kTLS). A BPF program executing bpf_msg_push_data() during bpf_exec_tx_verdict() can increase msg_pl->sg.size by inserting data outside the original message iterator. When cork_bytes is set and the remaining scatter-gather size is below that threshold, the affected code returns -ENOSPC and attempts to roll back to non-zero-copy processing. The rollback resets msg->msg_iter but uses the enlarged scatter-gather size to calculate the iterator reversion, potentially exceeding the iterator's actual size and triggering a kernel BUG and panic in iov_iter_revert().
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A Linux kernel BPF sockmap vulnerability can trigger a kernel panic during kernel TLS message processing. When a BPF program expands message data and enables corking, incorrect rollback handling can revert the message iterator beyond its actual size. The advisory rates this as a local, low-privilege denial-of-service vulnerability with high availability impact and a CVSS v3 score of 5.5.
A Linux kernel availability vulnerability in the BPF, sockmap, and kTLS send path that can trigger a kernel panic due to incorrect message-iterator rollback handling after BPF data pushes.
Linux kernel BPF vulnerability that can trigger a kTLS panic when used with sockmap.
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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.
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