{ "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" } } } }