{"api_version":"1","generated_at":"2026-08-25T08:07:25+00:00","cve":"CVE-2026-72226","urls":{"html":"https://cve.report/CVE-2026-72226","api":"https://cve.report/api/cve/CVE-2026-72226.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72226","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72226"},"summary":{"title":"batman-adv: tt: prevent TVLV OOB check overflow","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: prevent TVLV OOB check overflow\n\nA TT unicast TVLV contains the number of VLANs stored in it. This number is\nan u16 and gets multiplied by the size of the struct\nbatadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16\nused to store the tt_vlan_len. All additional safety checks to prevent\nout-of-bounds access of the TVLV buffer are invalid due to this overflow.\n\nUsing size_t prevents this overflow and ensures that the safety checks\ncompare against the actual buffer requirements.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:49","updated_at":"2026-08-17 06:18:23"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"9.8","severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/7319c0794f91be2734aac695794e7203606b49f8","name":"https://git.kernel.org/stable/c/7319c0794f91be2734aac695794e7203606b49f8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0de12a4c4847f571d82a9cd96bc633eded41d7c6","name":"https://git.kernel.org/stable/c/0de12a4c4847f571d82a9cd96bc633eded41d7c6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d6ff4764ff784ede25f5c83a6f5883a74c93a5ea","name":"https://git.kernel.org/stable/c/d6ff4764ff784ede25f5c83a6f5883a74c93a5ea","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7a581d9aaba8c82bd6177fa36b2588eea77f6e2b","name":"https://git.kernel.org/stable/c/7a581d9aaba8c82bd6177fa36b2588eea77f6e2b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6222b443686525cb5a9b6a9cecf23b2e2ab23e2a","name":"https://git.kernel.org/stable/c/6222b443686525cb5a9b6a9cecf23b2e2ab23e2a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/1898273c5dc8148267ef9f97cd2517a2822350e7","name":"https://git.kernel.org/stable/c/1898273c5dc8148267ef9f97cd2517a2822350e7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/604bd5042fbcd1ab9f7cd98fd847ec017aeede8a","name":"https://git.kernel.org/stable/c/604bd5042fbcd1ab9f7cd98fd847ec017aeede8a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3256c05d5a9db34346eaf20f52dddde984852d77","name":"https://git.kernel.org/stable/c/3256c05d5a9db34346eaf20f52dddde984852d77","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72226","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72226","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b 0de12a4c4847f571d82a9cd96bc633eded41d7c6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b d6ff4764ff784ede25f5c83a6f5883a74c93a5ea git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b 1898273c5dc8148267ef9f97cd2517a2822350e7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b 604bd5042fbcd1ab9f7cd98fd847ec017aeede8a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72226","cve":"CVE-2026-72226","epss":"0.007040000","percentile":"0.502750000","score_date":"2026-08-17","updated_at":"2026-08-18 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the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: prevent TVLV OOB check overflow\n\nA TT unicast TVLV contains the number of VLANs stored in it. This number is\nan u16 and gets multiplied by the size of the struct\nbatadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16\nused to store the tt_vlan_len. All additional safety checks to prevent\nout-of-bounds access of the TVLV buffer are invalid due to this overflow.\n\nUsing size_t prevents this overflow and ensures that the safety checks\ncompare against the actual buffer requirements."}],"metrics":[{"cvssV3_1":{"baseScore":9.8,"baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - Crafted BATADV_UNICAST_TVLV frames from remote mesh peers reach batadv_tt_tvlv_unicast_handler_v1() via batadv_batman_skb_recv() → batadv_recv_unicast_tvlv() → batadv_tvlv_containers_process() without local syscall or ioctl access on the victim.\nAC:L - An attacker reliably bypasses TVLV bounds checks by setting num_vlan so flex_array_size() overflows the u16 tt_vlan_len (e.g. 8192 VLANs wraps length to 4); all packet fields are attacker-controlled with no races or victim-state dependencies.\nPR:N - batman-adv TVLV receive processing performs no authentication or capability check on senders; any unauthenticated mesh peer injecting ETH_P_BATMAN unicast TVLV frames to an active mesh node triggers the vulnerable path without Linux credentials on the victim.\nUI:N - Exploitation is triggered solely by the attacker transmitting malicious mesh packets; no victim mount, click, or runtime configuration change is required beyond batman-adv already being active on a mesh interface.\nS:U - Out-of-bounds reads and translation-table corruption occur within the victim kernel networking subsystem on the mesh node; the flaw does not cross VM, container, IOMMU, or other separate security-authority boundaries.\nC:H - Overflowed tt_vlan_len invalidates the length check, so batadv_handle_tt_response() offsets tt_change by struct_size() far beyond the skb and _batadv_tt_update_changes() performs out-of-bounds reads of kernel memory for each computed entry.\nI:H - Out-of-bounds tt_change data drives batadv_tt_global_add()/batadv_tt_global_del() and batadv_tt_fill_gtable(), writing attacker-influenced or leaked bytes into kmalloc-backed translation-table objects suitable for heap corruption and control-flow hijacking.\nA:H - Dereferencing tt_change pointers tens of kilobytes past the packet buffer can cause kernel oops or panic, and corrupt translation-table updates can destabilize or disable mesh routing on the victim node."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:41:46.404Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/0de12a4c4847f571d82a9cd96bc633eded41d7c6"},{"url":"https://git.kernel.org/stable/c/d6ff4764ff784ede25f5c83a6f5883a74c93a5ea"},{"url":"https://git.kernel.org/stable/c/1898273c5dc8148267ef9f97cd2517a2822350e7"},{"url":"https://git.kernel.org/stable/c/604bd5042fbcd1ab9f7cd98fd847ec017aeede8a"},{"url":"https://git.kernel.org/stable/c/7319c0794f91be2734aac695794e7203606b49f8"},{"url":"https://git.kernel.org/stable/c/3256c05d5a9db34346eaf20f52dddde984852d77"},{"url":"https://git.kernel.org/stable/c/6222b443686525cb5a9b6a9cecf23b2e2ab23e2a"},{"url":"https://git.kernel.org/stable/c/7a581d9aaba8c82bd6177fa36b2588eea77f6e2b"}],"title":"batman-adv: tt: prevent TVLV OOB check overflow","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72226","datePublished":"2026-08-15T05:54:18.285Z","dateReserved":"2026-08-09T03:40:39.913Z","dateUpdated":"2026-08-17T05:41:46.404Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:49","lastModifiedDate":"2026-08-17 06:18:23","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":9.8,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72226","Ordinal":"1","Title":"batman-adv: tt: prevent TVLV OOB check overflow","CVE":"CVE-2026-72226","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72226","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: prevent TVLV OOB check overflow\n\nA TT unicast TVLV contains the number of VLANs stored in it. This number is\nan u16 and gets multiplied by the size of the struct\nbatadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16\nused to store the tt_vlan_len. All additional safety checks to prevent\nout-of-bounds access of the TVLV buffer are invalid due to this overflow.\n\nUsing size_t prevents this overflow and ensures that the safety checks\ncompare against the actual buffer requirements.","Type":"Description","Title":"batman-adv: tt: prevent TVLV OOB check overflow"}]}}}