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CVE-2025-21867 is a use-after-free vulnerability in the Linux kernel's BPF/XDP test-run functionality. When bpf_prog_test_run_xdp() passes an invalid user_data length to bpf_test_init(), the resulting socket-buffer data can lack a complete Ethernet header. Subsequent processing in eth_skb_pkt_type() accesses that data, triggering a use-after-free detected by KMSAN. The fix rejects user_data lengths smaller than ETH_HLEN and removes an unnecessary user_size-versus-size check.
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A use-after-free vulnerability in the Linux kernel's BPF/XDP test-run functionality. An invalid user_data value passed through bpf_prog_test_run_xdp() allows eth_skb_pkt_type() to access packet data that lacks an Ethernet header. The fix rejects user_data values smaller than ETH_HLEN. The advisory assigns CVSS v3 severity 7.8, with local access and low privileges required and potentially high confidentiality, integrity, and availability impacts.
A high-severity local Linux kernel use-after-free vulnerability in the BPF/XDP test-run path. Malformed BPF test input can cause Ethernet-header access to invalid or freed skb data; the referenced fix validates the user_data length in bpf_test_init().
A Linux kernel BPF test_run use-after-free issue in eth_skb_pkt_type().
A Linux kernel BPF test_run use-after-free vulnerability in eth_skb_pkt_type(), addressed by the Red Hat Enterprise Linux 10 kernel security update.
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