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CVE-2025-21867 is a use-after-free vulnerability in the Linux kernel BPF program test-run path for XDP. An invalid user_data length supplied through bpf_prog_test_run_xdp() can reach bpf_test_init() without ensuring that it is at least the Ethernet-header length. Subsequent processing builds an skb and invokes eth_skb_pkt_type(), which accesses packet data that does not contain a complete Ethernet header. The upstream fix makes bpf_test_init() reject user_data values smaller than ETH_HLEN.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A use-after-free vulnerability in the Linux kernel BPF test_run path, specifically eth_skb_pkt_type().
Linux kernel BPF test_run use-after-free vulnerability in eth_skb_pkt_type().
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.