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CVE-2024-41091 is a missing frame-length validation vulnerability in the Linux kernel TUN networking implementation. The tun_xdp_one() path accepts Ethernet frames shorter than ETH_HLEN, allowing eth_type_trans() to access an incomplete Ethernet header and potentially forwarding a corrupted socket buffer to downstream networking components. Subsequent processing can access data beyond the actual frame length or encounter inconsistent header-length metadata. In affected KVM configurations, a guest using virtio-net can send an undersized frame that reaches mlx5_core and triggers a host kernel panic. The fix rejects frames shorter than the Ethernet header size, matching the validation already performed by tun_get_user() for IFF_TAP.
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A Linux kernel TUN/TAP vulnerability caused by missing validation of Ethernet frame lengths in tun_xdp_one(). Frames shorter than the Ethernet header can cause out-of-bounds access or inconsistent packet metadata. The listed CVSS v3 score is 7.1, indicating local exploitation requiring low privileges, with potential confidentiality and availability impacts.
Linux kernel virtio-net TUN and mlx5_core short-frame denial-of-service flaw.
Linux kernel virtio-net TUN and mlx5_core short-frame denial-of-service flaw.
Linux kernel virtio-net TUN short-frame denial-of-service flaw involving mlx5_core.
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Cross-references every affected SKU, including bundled OEM variants.
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