{"api_version":"1","generated_at":"2026-08-20T20:21:01+00:00","cve":"CVE-2026-72232","urls":{"html":"https://cve.report/CVE-2026-72232","api":"https://cve.report/api/cve/CVE-2026-72232.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72232","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72232"},"summary":{"title":"batman-adv: ensure minimal ethernet header on TX","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: ensure minimal ethernet header on TX\n\nAs documented in commit 8bd67ebb50c0 (\"net: bridge: xmit: make sure we have\nat least eth header len bytes\"), it is possible by for a local user with\neBPF TC hook access to attach a tc filter which truncates the packet and\nredirects to an batadv interface. But the code assumes that at least\nETH_HLEN bytes are available and thus might read outside of the available\nbuffer.\n\nThe batadv_interface_tx() must therefore always check itself if enough data\nis available for the ethernet header and don't rely on min_header_len.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:50","updated_at":"2026-08-17 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the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: ensure minimal ethernet header on TX\n\nAs documented in commit 8bd67ebb50c0 (\"net: bridge: xmit: make sure we have\nat least eth header len bytes\"), it is possible by for a local user with\neBPF TC hook access to attach a tc filter which truncates the packet and\nredirects to an batadv interface. But the code assumes that at least\nETH_HLEN bytes are available and thus might read outside of the available\nbuffer.\n\nThe batadv_interface_tx() must therefore always check itself if enough data\nis available for the ethernet header and don't rely on min_header_len."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - Reachable only via local ndo_start_xmit on a batadv netdev after a TC/eBPF program (bpf_redirect/bpf_clone_redirect or mirred) truncates an skb below ETH_HLEN; there is no credible remote or adjacent path without local TC/BPF control.\nAC:L - An attacker with CAP_NET_ADMIN can reliably attach a TC clsact filter, shrink the skb (e.g. bpf_skb_adjust_room), and redirect to bat0; no race or victim state beyond attacker-controlled namespace setup is required.\nPR:L - Exploitation requires CAP_NET_ADMIN to attach TC/BPF programs and create/use a batadv interface; this capability is obtainable by unprivileged users inside user/network namespaces (unshare -Urn), not only init-namespace root.\nUI:N - No victim interaction is needed; the attacker triggers the bug by installing the TC filter and transmitting or test-running the crafted skb themselves.\nS:U - Impact remains within the kernel/network stack security authority (memory disclosure, mesh state corruption, crash); it does not by itself cross a VM, container, or IOMMU boundary.\nC:H - Missing ETH_HLEN validation causes an out-of-bounds read of up to 12 bytes past skb->tail via eth_hdr(), exposing adjacent slab/uninitialized kernel memory and enabling heap grooming for further exploitation.\nI:H - OOB-read ethernet header fields drive batadv_tt_local_add, DAT/ARP snooping, and mesh forwarding decisions, corrupting translation/routing state; kernel OOB reads are also commonly chained into arbitrary write primitives.\nA:H - Reading beyond the skb buffer can trigger kernel oops/panic (as seen in the analogous bridge/bpf_redirect syzbot reports) and enables repeated, attacker-controlled crashes on mesh nodes running batman-adv."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:41:49.683Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/58799078afebd5115e052bf69ad6697f9759dd6f"},{"url":"https://git.kernel.org/stable/c/38cd10b0aeec755d89f78722a2b83f4088ff0cb0"},{"url":"https://git.kernel.org/stable/c/811fea37620f2097955d95ce81cfdba03fd30f1b"},{"url":"https://git.kernel.org/stable/c/e6640923afee619d9fa82b07394dc9498e202304"},{"url":"https://git.kernel.org/stable/c/6b4f521e01257387906f8b969ad3450d8208d4e2"},{"url":"https://git.kernel.org/stable/c/9e16b6751a8206de0b865d99bb02771e6751d12d"},{"url":"https://git.kernel.org/stable/c/dbeb4145d9778f922f459935da9a027750765a69"},{"url":"https://git.kernel.org/stable/c/49df66b7993c80b80c7eb9a84ba5b3410c8296a0"}],"title":"batman-adv: ensure minimal ethernet header on TX","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72232","datePublished":"2026-08-15T05:54:22.864Z","dateReserved":"2026-08-09T03:40:39.913Z","dateUpdated":"2026-08-17T05:41:49.683Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:50","lastModifiedDate":"2026-08-17 06:18:24","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72232","Ordinal":"1","Title":"batman-adv: ensure minimal ethernet header on TX","CVE":"CVE-2026-72232","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72232","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: ensure minimal ethernet header on TX\n\nAs documented in commit 8bd67ebb50c0 (\"net: bridge: xmit: make sure we have\nat least eth header len bytes\"), it is possible by for a local user with\neBPF TC hook access to attach a tc filter which truncates the packet and\nredirects to an batadv interface. But the code assumes that at least\nETH_HLEN bytes are available and thus might read outside of the available\nbuffer.\n\nThe batadv_interface_tx() must therefore always check itself if enough data\nis available for the ethernet header and don't rely on min_header_len.","Type":"Description","Title":"batman-adv: ensure minimal ethernet header on TX"}]}}}