{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72234","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.914Z","datePublished":"2026-08-15T05:54:24.395Z","dateUpdated":"2026-08-17T05:41:51.879Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:41:51.879Z"},"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":{"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"},"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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/routing.c"],"versions":[{"version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","lessThan":"aa9558af859934f24717d4bab97d61004f91a736","status":"affected","versionType":"git"},{"version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","lessThan":"9c2c05629e46c1fd43931506d41c56a885a98eb4","status":"affected","versionType":"git"},{"version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","lessThan":"7b162b36de750565404cd3b98315706622c6974f","status":"affected","versionType":"git"},{"version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","lessThan":"ed90eb5c68420cdfe67ec1f773324198d2ef6f50","status":"affected","versionType":"git"},{"version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","lessThan":"979175834a699ccc3c4c0b0ba60ecae0f135a587","status":"affected","versionType":"git"},{"version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","lessThan":"b8afcf799b2cc92c41beebd029e53ed18960184a","status":"affected","versionType":"git"},{"version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","lessThan":"9a7b7248798123efbd5fafe58461d57c7cc718af","status":"affected","versionType":"git"},{"version":"c018ad3de61a1dc4194879a53e5559e094aa7b1a","lessThan":"7141990add3f75436f2933cb310654cad3b1e3e9","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/batman-adv/routing.c"],"versions":[{"version":"3.13","status":"affected"},{"version":"0","lessThan":"3.13","status":"unaffected","versionType":"semver"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.13","versionEndExcluding":"7.2"}]}]}],"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"}}}}