{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72233", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.913Z", "datePublished": "2026-08-15T05:54:23.663Z", "dateUpdated": "2026-08-17T05:41:50.777Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:41:50.777Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: reacquire gw address after skb realloc\n\nThe pskb_may_pull() called by batadv_bla_is_backbone_gw() could reallocate\nthe buffer behind the skb. Variables which were pointing to the old buffer\nneed to be reassigned to avoid an use-after-free." } ], "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 - The bug is hit in batadv_recv_unicast_packet() when batman-adv ETH_P_BATMAN frames are received on a mesh hard interface via batadv_batman_skb_recv(); exploitation requires a peer on the same wireless/bridged mesh segment (community, industrial, or gateway meshes), matching adjacent Wi-Fi/L2 reachability rather than arbitrary Internet routing.\nAC:L - An on-mesh attacker fully controls the injected unicast skb (headers, VLAN tagging) to make batadv_bla_is_backbone_gw()'s pskb_may_pull() reallocate the buffer; this is a deterministic use-after-free with no victim-timed race or layout the attacker cannot influence by resending crafted frames.\nPR:N - No account or capability on the victim host is required; any unauthenticated mesh participant (or L2 source spoofer on the mesh/backbone) can send batman-adv unicast packets destined to the victim's MAC through the normal RX handler without local login or CAP_NET_ADMIN on the target.\nUI:N - The vulnerable path runs automatically in softirq when the mesh interface receives qualifying unicast traffic; the victim operator does not need to mount a filesystem, click a link, or perform any deliberate action beyond running an active batman-adv mesh with bridge loop avoidance enabled.\nS:U - Exploitation corrupts or reads kernel heap memory inside the batman-adv RX path on the same host; it does not cross a VM/hypervisor, container, or IOMMU security boundary to impact a different authority's resources.\nC:H - After pskb_may_pull() frees the old skb head, the stale orig_addr_gw pointer is read through %pM in batadv_dbg(), constituting a kernel slab use-after-free that can disclose adjacent freed-object contents and is scored as arbitrary-read class per UAF guidance.\nI:H - Use-after-free of skb linear data is heap memory corruption; even though the immediate stale access is for logging, UAF on RX skbs enables spray/reuse of the freed buffer for control of subsequent kernel objects and potential write primitives.\nA:H - Dereferencing a freed skb buffer in interrupt/RX context can trigger KASAN slab-use-after-free reports, kernel oops, or panic on affected builds; any exploitable UAF on the packet receive path is rated high availability impact." } ] } ], "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": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "41819c5467b6eb8ab4567f0ac98702ce9b6abbb1", "status": "affected", "versionType": "git" }, { "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f", "status": "affected", "versionType": "git" }, { "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "4a6673c55752a7aa41e28f51660eb981504ca088", "status": "affected", "versionType": "git" }, { "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "ab2bac47a02637df1128a151e81d3ec14767f4bb", "status": "affected", "versionType": "git" }, { "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "dc16bbf53cede1baf564bf0c8a861114b64e18b3", "status": "affected", "versionType": "git" }, { "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "e5e18886aadd3870e2d84e32a9678317fab1dd9e", "status": "affected", "versionType": "git" }, { "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf", "status": "affected", "versionType": "git" }, { "version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88", "lessThan": "cdf3b5af2bc4431e58629e8ad2086b1e9185c761", "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": "4.12", "status": "affected" }, { "version": "0", "lessThan": "4.12", "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": "4.12", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.12", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/41819c5467b6eb8ab4567f0ac98702ce9b6abbb1" }, { "url": "https://git.kernel.org/stable/c/a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f" }, { "url": "https://git.kernel.org/stable/c/4a6673c55752a7aa41e28f51660eb981504ca088" }, { "url": "https://git.kernel.org/stable/c/ab2bac47a02637df1128a151e81d3ec14767f4bb" }, { "url": "https://git.kernel.org/stable/c/dc16bbf53cede1baf564bf0c8a861114b64e18b3" }, { "url": "https://git.kernel.org/stable/c/e5e18886aadd3870e2d84e32a9678317fab1dd9e" }, { "url": "https://git.kernel.org/stable/c/f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf" }, { "url": "https://git.kernel.org/stable/c/cdf3b5af2bc4431e58629e8ad2086b1e9185c761" } ], "title": "batman-adv: bla: reacquire gw address after skb realloc", "x_generator": { "engine": "bippy-1.2.0" } } } }