{"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": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/batman-adv/mesh-interface.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "58799078afebd5115e052bf69ad6697f9759dd6f", "status": "affected", "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "versionType": "git"}, {"lessThan": "38cd10b0aeec755d89f78722a2b83f4088ff0cb0", "status": "affected", "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "versionType": "git"}, {"lessThan": "811fea37620f2097955d95ce81cfdba03fd30f1b", "status": "affected", "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "versionType": "git"}, {"lessThan": "e6640923afee619d9fa82b07394dc9498e202304", "status": "affected", "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "versionType": "git"}, {"lessThan": "6b4f521e01257387906f8b969ad3450d8208d4e2", "status": "affected", "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "versionType": "git"}, {"lessThan": "9e16b6751a8206de0b865d99bb02771e6751d12d", "status": "affected", "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "versionType": "git"}, {"lessThan": "dbeb4145d9778f922f459935da9a027750765a69", "status": "affected", "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "versionType": "git"}, {"lessThan": "49df66b7993c80b80c7eb9a84ba5b3410c8296a0", "status": "affected", "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/batman-adv/mesh-interface.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.38"}, {"lessThan": "2.6.38", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-72232", "lastModified": "2026-08-17T06:18:24.530", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T06:21:50.137", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/38cd10b0aeec755d89f78722a2b83f4088ff0cb0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/49df66b7993c80b80c7eb9a84ba5b3410c8296a0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/58799078afebd5115e052bf69ad6697f9759dd6f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6b4f521e01257387906f8b969ad3450d8208d4e2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/811fea37620f2097955d95ce81cfdba03fd30f1b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9e16b6751a8206de0b865d99bb02771e6751d12d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/dbeb4145d9778f922f459935da9a027750765a69"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e6640923afee619d9fa82b07394dc9498e202304"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: batman-adv: ensure minimal ethernet header on TX", "id": "2516493", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516493"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in the `batman-adv` component of the Linux kernel. A local user with extended Berkeley Packet Filter (eBPF) traffic control (TC) hook access could exploit this by attaching a TC filter that truncates a packet and redirects it to a `batman-adv` interface. The `batadv_interface_tx()` function then attempts to read beyond the allocated buffer for the Ethernet header, potentially leading to an out-of-bounds read. This could result in information disclosure or a denial of service."], "name": "CVE-2026-72232", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-72232\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-72232\nhttps://lore.kernel.org/linux-cve-announce/2026081549-CVE-2026-72232-a293@gregkh/T"], "threat_severity": "Moderate"}