{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72232", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.913Z", "datePublished": "2026-08-15T05:54:22.864Z", "dateUpdated": "2026-08-17T05:41:49.683Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:41:49.683Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/mesh-interface.c" ], "versions": [ { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "58799078afebd5115e052bf69ad6697f9759dd6f", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "38cd10b0aeec755d89f78722a2b83f4088ff0cb0", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "811fea37620f2097955d95ce81cfdba03fd30f1b", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "e6640923afee619d9fa82b07394dc9498e202304", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "6b4f521e01257387906f8b969ad3450d8208d4e2", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "9e16b6751a8206de0b865d99bb02771e6751d12d", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "dbeb4145d9778f922f459935da9a027750765a69", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "49df66b7993c80b80c7eb9a84ba5b3410c8296a0", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/mesh-interface.c" ], "versions": [ { "version": "2.6.38", "status": "affected" }, { "version": "0", "lessThan": "2.6.38", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }