{"api_version":"1","generated_at":"2026-08-20T20:20:47+00:00","cve":"CVE-2026-72235","urls":{"html":"https://cve.report/CVE-2026-72235","api":"https://cve.report/api/cve/CVE-2026-72235.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72235","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72235"},"summary":{"title":"batman-adv: retrieve ethhdr after potential skb realloc on RX","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: retrieve ethhdr after potential skb realloc on RX\n\npskb_may_pull() in batadv_interface_rx() could reallocate the buffer behind\nthe skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free.\n\nThis was done correctly for the VLAN header but missed for the ethernet\nheader which is later used for the TT and AP isolation handling.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:50","updated_at":"2026-08-17 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72235","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 6e189f14d1ea28db212b9d70a02131a7ce518012 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 a1820344b180cb55af748f102bc536b5c93164db git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 6abf73589bed3f27ee240c08108feb72bed0b9c6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c6c8fea29769d998d94fcec9b9f14d4b52b349d3 f19259395b44af67f3c274e34237c295b526b859 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":"72235","cve":"CVE-2026-72235","epss":"0.003390000","percentile":"0.268710000","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: retrieve ethhdr after potential skb realloc on RX\n\npskb_may_pull() in batadv_interface_rx() could reallocate the buffer behind\nthe skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free.\n\nThis was done correctly for the VLAN header but missed for the ethernet\nheader which is later used for the TT and AP isolation handling."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:A - Exploitation requires delivering crafted ETH_P_BATMAN frames on the victim's batman-adv mesh hard interface (802.11/wired L2 mesh), reachable from any adjacent mesh peer without local shell access.\nAC:L - The attacker fully controls remote batman-adv packet contents (VLAN-encapsulated payload and skb layout) and can repeatedly send unicast/broadcast frames to reliably force pskb_may_pull() skb reallocation.\nPR:N - No privileges on the victim are required; any unauthenticated remote mesh participant that can inject batman-adv RX frames onto an active mesh node can reach batadv_interface_rx().\nUI:N - Exploitation is triggered solely by the attacker sending malicious mesh packets; no victim user action (mounting, clicking, or configuration changes) is needed at exploit time.\nS:U - Impact is kernel memory corruption and potential privilege escalation on the mesh node; it does not cross a VM/host, IOMMU, or sandbox security boundary.\nC:H - Stale ethhdr after skb realloc is a use-after-free read of freed skb data; attacker-influenced bytes from ethhdr->h_source/h_dest are consumed by TT and AP-isolation logic, enabling arbitrary kernel memory disclosure.\nI:H - UAF-supplied MAC data is copied into translation-table heap objects via batadv_tt_add_temporary_global_entry()/batadv_tt_global_add(), providing a memory-corruption primitive suitable for control-flow or data hijacking.\nA:H - Use-after-free on the RX path can cause kernel oops/panic from dereferencing freed skb buffer memory during TT/AP-isolation handling, even before full exploitation."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:41:52.969Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/6e189f14d1ea28db212b9d70a02131a7ce518012"},{"url":"https://git.kernel.org/stable/c/a1820344b180cb55af748f102bc536b5c93164db"},{"url":"https://git.kernel.org/stable/c/6abf73589bed3f27ee240c08108feb72bed0b9c6"},{"url":"https://git.kernel.org/stable/c/f19259395b44af67f3c274e34237c295b526b859"},{"url":"https://git.kernel.org/stable/c/2cefa5141cab8ec1e4b24cf585958b13f2e3049d"},{"url":"https://git.kernel.org/stable/c/85a71a81854e0e191ad0e533eabb4eff54866feb"},{"url":"https://git.kernel.org/stable/c/b031fc97e1993d29d6c3a0e86a99140528cf31e8"},{"url":"https://git.kernel.org/stable/c/035e1fed892d3d06002a73ff73668f618a514644"}],"title":"batman-adv: retrieve ethhdr after potential skb realloc on RX","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72235","datePublished":"2026-08-15T05:54:25.136Z","dateReserved":"2026-08-09T03:40:39.914Z","dateUpdated":"2026-08-17T05:41:52.969Z","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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72235","Ordinal":"1","Title":"batman-adv: retrieve ethhdr after potential skb realloc on RX","CVE":"CVE-2026-72235","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72235","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: retrieve ethhdr after potential skb realloc on RX\n\npskb_may_pull() in batadv_interface_rx() could reallocate the buffer behind\nthe skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free.\n\nThis was done correctly for the VLAN header but missed for the ethernet\nheader which is later used for the TT and AP isolation handling.","Type":"Description","Title":"batman-adv: retrieve ethhdr after potential skb realloc on RX"}]}}}