{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72235", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.914Z", "datePublished": "2026-08-15T05:54:25.136Z", "dateUpdated": "2026-08-17T05:41:52.969Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:41:52.969Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "metrics": [ { "cvssV3_1": { "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" }, "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/batman-adv/mesh-interface.c" ], "versions": [ { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "6e189f14d1ea28db212b9d70a02131a7ce518012", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "a1820344b180cb55af748f102bc536b5c93164db", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "6abf73589bed3f27ee240c08108feb72bed0b9c6", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "f19259395b44af67f3c274e34237c295b526b859", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "2cefa5141cab8ec1e4b24cf585958b13f2e3049d", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "85a71a81854e0e191ad0e533eabb4eff54866feb", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "b031fc97e1993d29d6c3a0e86a99140528cf31e8", "status": "affected", "versionType": "git" }, { "version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3", "lessThan": "035e1fed892d3d06002a73ff73668f618a514644", "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/mesh-interface.c" ], "versions": [ { "version": "2.6.38", "status": "affected" }, { "version": "0", "lessThan": "2.6.38", "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": "2.6.38", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.38", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }