{"api_version":"1","generated_at":"2026-08-29T12:12:53+00:00","cve":"CVE-2026-80601","urls":{"html":"https://cve.report/CVE-2026-80601","api":"https://cve.report/api/cve/CVE-2026-80601.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80601","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80601"},"summary":{"title":"batman-adv: gw: acquire ethernet header only after skb realloc","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: gw: acquire ethernet header only after skb realloc\n\nThe pskb_may_pull() called by batadv_get_vid() could reallocate the buffer\nbehind the skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-28 08:16:43","updated_at":"2026-08-29 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the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: gw: acquire ethernet header only after skb realloc\n\nThe pskb_may_pull() called by batadv_get_vid() could reallocate the buffer\nbehind the skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free."}],"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 - The bug is hit only in batadv_interface_tx on outgoing bat0 traffic; the highest-impact path is an unauthenticated client on the same WiFi/LAN segment bridged to a batman-adv gateway node sending a crafted VLAN-tagged DHCP packet into bat0.\nAC:L - Triggering is synchronous and attacker-controlled: a VLAN-tagged DHCP discover/request shaped to force pskb_may_pull() skb reallocation deterministically hits the stale ethhdr UAF without races or victim-specific timing.\nPR:N - No privileges on the mesh router are required when a client on a bridged WiFi/LAN port injects the malicious DHCP frame; gateway-client mode is operator configuration, not an attacker privilege.\nUI:N - Exploitation requires no victim interaction beyond normal always-on mesh bridging and DHCP forwarding; the attacker only sends a malicious frame.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the same kernel/host security boundary, not a cross-boundary escape such as VM or sandbox breakout.\nC:H - This is a use-after-free read: after skb reallocation, ethhdr->h_source/h_dest dereference freed skb head memory, enabling uncontrolled kernel memory disclosure and further exploitation primitives.\nI:H - UAF on skb data can corrupt routing lookups (batadv_transtable_search) and adjacent kernel heap state, providing a standard path to controlled writes and arbitrary kernel code execution.\nA:H - Reading freed skb memory via ethhdr commonly causes kernel oops/panic on the batman-adv gateway node, yielding complete loss of mesh connectivity and host availability."}]}],"providerMetadata":{"dateUpdated":"2026-08-29T06:21:13.415Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/2760b38222c8828b075802342fe3b91eb823d542"},{"url":"https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6"},{"url":"https://git.kernel.org/stable/c/b79884a5567bf788fb76c30832467cf6a56f3c0d"},{"url":"https://git.kernel.org/stable/c/afac8096bde4948e3caa7e4dd733867cfbd3018e"},{"url":"https://git.kernel.org/stable/c/e3f4325e35dd6e76b80665f3510738ce34819753"},{"url":"https://git.kernel.org/stable/c/e6b43acd34b219b807e65096ce207b087942779d"},{"url":"https://git.kernel.org/stable/c/916dac5f2944f63f07f7b501acbea6737dbbed0e"},{"url":"https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518"}],"title":"batman-adv: gw: acquire ethernet header only after skb realloc","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80601","datePublished":"2026-08-28T06:48:27.948Z","dateReserved":"2026-08-26T14:34:25.771Z","dateUpdated":"2026-08-29T06:21:13.415Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 08:16:43","lastModifiedDate":"2026-08-29 07:16:45","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":"80601","Ordinal":"1","Title":"batman-adv: gw: acquire ethernet header only after skb realloc","CVE":"CVE-2026-80601","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80601","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: gw: acquire ethernet header only after skb realloc\n\nThe pskb_may_pull() called by batadv_get_vid() could reallocate the buffer\nbehind the skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free.","Type":"Description","Title":"batman-adv: gw: acquire ethernet header only after skb realloc"}]}}}