{"api_version":"1","generated_at":"2026-08-20T20:20:46+00:00","cve":"CVE-2026-72234","urls":{"html":"https://cve.report/CVE-2026-72234","api":"https://cve.report/api/cve/CVE-2026-72234.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72234","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72234"},"summary":{"title":"batman-adv: access unicast_ttvn skb->data only after skb realloc","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: access unicast_ttvn skb->data 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.\n\nThis was done correctly for the ethernet header but missed for the\nunicast_packet pointer.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:50","updated_at":"2026-08-17 06:18:24"},"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/9a7b7248798123efbd5fafe58461d57c7cc718af","name":"https://git.kernel.org/stable/c/9a7b7248798123efbd5fafe58461d57c7cc718af","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ed90eb5c68420cdfe67ec1f773324198d2ef6f50","name":"https://git.kernel.org/stable/c/ed90eb5c68420cdfe67ec1f773324198d2ef6f50","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7b162b36de750565404cd3b98315706622c6974f","name":"https://git.kernel.org/stable/c/7b162b36de750565404cd3b98315706622c6974f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/979175834a699ccc3c4c0b0ba60ecae0f135a587","name":"https://git.kernel.org/stable/c/979175834a699ccc3c4c0b0ba60ecae0f135a587","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b8afcf799b2cc92c41beebd029e53ed18960184a","name":"https://git.kernel.org/stable/c/b8afcf799b2cc92c41beebd029e53ed18960184a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9c2c05629e46c1fd43931506d41c56a885a98eb4","name":"https://git.kernel.org/stable/c/9c2c05629e46c1fd43931506d41c56a885a98eb4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/aa9558af859934f24717d4bab97d61004f91a736","name":"https://git.kernel.org/stable/c/aa9558af859934f24717d4bab97d61004f91a736","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7141990add3f75436f2933cb310654cad3b1e3e9","name":"https://git.kernel.org/stable/c/7141990add3f75436f2933cb310654cad3b1e3e9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72234","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72234","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c018ad3de61a1dc4194879a53e5559e094aa7b1a aa9558af859934f24717d4bab97d61004f91a736 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c018ad3de61a1dc4194879a53e5559e094aa7b1a 9c2c05629e46c1fd43931506d41c56a885a98eb4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c018ad3de61a1dc4194879a53e5559e094aa7b1a 7b162b36de750565404cd3b98315706622c6974f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c018ad3de61a1dc4194879a53e5559e094aa7b1a ed90eb5c68420cdfe67ec1f773324198d2ef6f50 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.212 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.178 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.145 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.97 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.40 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72234","cve":"CVE-2026-72234","epss":"0.006840000","percentile":"0.495410000","score_date":"2026-08-17","updated_at":"2026-08-18 00:11:47"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/batman-adv/routing.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"aa9558af859934f24717d4bab97d61004f91a736","status":"affected","version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","versionType":"git"},{"lessThan":"9c2c05629e46c1fd43931506d41c56a885a98eb4","status":"affected","version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","versionType":"git"},{"lessThan":"7b162b36de750565404cd3b98315706622c6974f","status":"affected","version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","versionType":"git"},{"lessThan":"ed90eb5c68420cdfe67ec1f773324198d2ef6f50","status":"affected","version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","versionType":"git"},{"lessThan":"979175834a699ccc3c4c0b0ba60ecae0f135a587","status":"affected","version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","versionType":"git"},{"lessThan":"b8afcf799b2cc92c41beebd029e53ed18960184a","status":"affected","version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","versionType":"git"},{"lessThan":"9a7b7248798123efbd5fafe58461d57c7cc718af","status":"affected","version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","versionType":"git"},{"lessThan":"7141990add3f75436f2933cb310654cad3b1e3e9","status":"affected","version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/batman-adv/routing.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.13"},{"lessThan":"3.13","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"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.261","versionStartIncluding":"3.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.212","versionStartIncluding":"3.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.178","versionStartIncluding":"3.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.145","versionStartIncluding":"3.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.97","versionStartIncluding":"3.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"3.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"3.13","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"3.13","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: access unicast_ttvn skb->data 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.\n\nThis was done correctly for the ethernet header but missed for the\nunicast_packet pointer."}],"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 - Triggered in batadv_check_unicast_ttvn() when batadv_batman_skb_recv() processes incoming BATADV unicast packets from remote mesh peers on hard interfaces; crafted batman-adv frames reach the vulnerable code over the mesh network without local system access.\nAC:L - An attacker reliably triggers the UAF by sending a batman-adv unicast packet with a VLAN-tagged embedded Ethernet header to a victim node; packet fields are attacker-controlled and can force batadv_get_vid()'s pskb_may_pull() to reallocate the skb buffer.\nPR:N - No privileges are required on the victim host; exploitation only needs batman-adv active on an interface while the attacker acts as an unauthenticated mesh peer able to transmit batman-adv protocol frames to the target node.\nUI:N - No victim user interaction is needed; the kernel automatically processes the malicious batman-adv unicast packet on receive through the normal mesh routing receive path.\nS:U - The use-after-free corrupts kernel heap memory within the same host networking subsystem and does not cross VM, container, or IOMMU boundaries to impact a separate security authority.\nC:H - The stale unicast_packet pointer dereferences freed skb buffer memory for reads (unicast_packet->dest, unicast_packet->ttvn), constituting a kernel heap use-after-free that can disclose sensitive memory contents.\nI:H - The stale pointer is used for writes via ether_addr_copy(unicast_packet->dest) and unicast_packet->ttvn updates in reroute paths, enabling heap corruption and potential arbitrary kernel code execution.\nA:H - Use-after-free on the skb data buffer during batman-adv unicast processing can cause kernel oops, panic, or hang, and UAF heap corruption inherently threatens system availability even before full exploit development."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:41:51.879Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/aa9558af859934f24717d4bab97d61004f91a736"},{"url":"https://git.kernel.org/stable/c/9c2c05629e46c1fd43931506d41c56a885a98eb4"},{"url":"https://git.kernel.org/stable/c/7b162b36de750565404cd3b98315706622c6974f"},{"url":"https://git.kernel.org/stable/c/ed90eb5c68420cdfe67ec1f773324198d2ef6f50"},{"url":"https://git.kernel.org/stable/c/979175834a699ccc3c4c0b0ba60ecae0f135a587"},{"url":"https://git.kernel.org/stable/c/b8afcf799b2cc92c41beebd029e53ed18960184a"},{"url":"https://git.kernel.org/stable/c/9a7b7248798123efbd5fafe58461d57c7cc718af"},{"url":"https://git.kernel.org/stable/c/7141990add3f75436f2933cb310654cad3b1e3e9"}],"title":"batman-adv: access unicast_ttvn skb->data only after skb realloc","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72234","datePublished":"2026-08-15T05:54:24.395Z","dateReserved":"2026-08-09T03:40:39.914Z","dateUpdated":"2026-08-17T05:41:51.879Z","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: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":"72234","Ordinal":"1","Title":"batman-adv: access unicast_ttvn skb->data only after skb realloc","CVE":"CVE-2026-72234","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72234","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: access unicast_ttvn skb->data 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.\n\nThis was done correctly for the ethernet header but missed for the\nunicast_packet pointer.","Type":"Description","Title":"batman-adv: access unicast_ttvn skb->data only after skb realloc"}]}}}