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cve-2026-43036

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CVE-2026-43036 is a medium-severity Linux kernel networking vulnerability published on May 1, 2026, affecting TCPv4 GSO handling. The flaw allows an unsafe read of the IPv4 header field from PF_PACKET-injected traffic. The fix replaces a direct header dereference with skb_header_pointer() before checking frag_off. This CVE highlights how kernel security increasingly depends on whether old assumptions about packet layout still hold in modern fuzzed, virtualized, containerized, and offloaded networking stacks. Discussions on WindowsForum.com cover the technical details of the patch and its broader implications for kernel networking security.
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    CVE-2026-43036 Linux GSO TCPv4 frag_off Patch: Why Kernel Networking Assumptions Matter

    CVE-2026-43036 is a medium-severity Linux kernel networking flaw published on May 1, 2026, and modified by NVD on May 8, affecting multiple kernel release lines where TCPv4 GSO handling can read an unsafe IPv4 header field from PF_PACKET-injected traffic. The fix is small, almost boringly so...
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    • cve-2026-43036 linux kernel security pf_packet networking tcpv4 gso
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    • Forum: Security Alerts
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