{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72416", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.927Z", "datePublished": "2026-08-15T05:56:36.886Z", "dateUpdated": "2026-08-17T05:43:56.159Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:43:56.159Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_compat: ebtables emulation must reject non-bridge targets\n\nxtables targets return netfilter verdicts: NF_ACCEPT, NF_DROP, and so\non. ebtables targets return incompatible verdicts: EBT_ACCEPT,\nEBT_DROP, ... We cannot allow fallback to NFPROTO_UNSPEC.\n\nebtables doesn't permit this since\n11ff7288beb2 (\"netfilter: ebtables: reject non-bridge targets\")\nbut that commit missed the nft_compat layer." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H", "baseScore": 7.3, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached by installing a bridge-family nft_compat rule through NETLINK_NETFILTER (nftables netlink), which is a local syscall path; packet evaluation on bridge hooks can be driven by traffic, but creating the vulnerable rule state requires local netfilter administration.\nAC:L - Exploitation is deterministic once CAP_NET_ADMIN is held in the target network namespace: xt_request_find_target() falls back to NFPROTO_UNSPEC targets, nft_target_eval_bridge() misinterprets xtables verdicts, and sending matching bridge traffic reliably triggers the faulty evaluation (e.g. NULL ct in nf_nat_setup_info()).\nPR:L - All nfnetlink entry points are gated by netlink_net_capable(..., CAP_NET_ADMIN), which checks the socket network namespace user namespace; unprivileged local users routinely obtain this capability via user+network namespaces (unshare -Urn), matching the reporters' nft_compat reproduction model.\nUI:N - No victim interaction is required beyond the attacker obtaining namespace-local CAP_NET_ADMIN and installing the malicious bridge nft_compat rule; subsequent packet delivery to the bridge hook is automatic once the rule is committed.\nS:U - Impact is confined to the host kernel and its network filtering state; this is not a VM escape, hypervisor boundary crossing, or IOMMU/DMA sandbox bypass, but standard in-kernel netfilter misbehavior within the same security authority.\nC:L - The primary primitive is verdict-namespace type confusion between xtables (NF_*) and ebtables (EBT_*) return conventions; while no arbitrary read is demonstrated, a triggered kernel oops from NULL ct dereference in nf_nat_setup_info() can expose kernel pointers in crash logs accessible to the local attacker.\nI:H - Incompatible verdict translation lets xtables targets run under ebtables semantics: XT_CONTINUE (0xFFFFFFFF/-1) is mapped to EBT_ACCEPT/NF_ACCEPT instead of continuing rule evaluation, and mis-instantiated targets such as SNAT/DNAT can alter connection-tracking/NAT state before faulting, constituting type-confusion integrity impact.\nA:H - Installing an IP-family UNSPEC target (e.g. SNAT/DNAT rev 1/2) in a bridge nft_compat chain and passing traffic causes nf_nat_setup_info() to dereference a NULL nf_conn from nf_ct_get(), producing a kernel oops/panic; repeated bridge traffic can retrigger the crash for sustained denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/nft_compat.c" ], "versions": [ { "version": "0ca743a5599199152a31a7146b83213c786c2eb2", "lessThan": "efc17b9240d821c424bc5191a5c6e9384a06293e", "status": "affected", "versionType": "git" }, { "version": "0ca743a5599199152a31a7146b83213c786c2eb2", "lessThan": "b3f7a84540a0d014ec42343ff5909657c1bd1994", "status": "affected", "versionType": "git" }, { "version": "0ca743a5599199152a31a7146b83213c786c2eb2", "lessThan": "33e1875d6b5b552a2e5652b40074c604199354ee", "status": "affected", "versionType": "git" }, { "version": "0ca743a5599199152a31a7146b83213c786c2eb2", "lessThan": "c129b0185e707dce405968e21afccd5728b2ce63", "status": "affected", "versionType": "git" }, { "version": "0ca743a5599199152a31a7146b83213c786c2eb2", "lessThan": "9dbba7e694ec045f21ede2f892fb42b81b4e1692", "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/netfilter/nft_compat.c" ], "versions": [ { "version": "3.13", "status": "affected" }, { "version": "0", "lessThan": "3.13", "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": "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/efc17b9240d821c424bc5191a5c6e9384a06293e" }, { "url": "https://git.kernel.org/stable/c/b3f7a84540a0d014ec42343ff5909657c1bd1994" }, { "url": "https://git.kernel.org/stable/c/33e1875d6b5b552a2e5652b40074c604199354ee" }, { "url": "https://git.kernel.org/stable/c/c129b0185e707dce405968e21afccd5728b2ce63" }, { "url": "https://git.kernel.org/stable/c/9dbba7e694ec045f21ede2f892fb42b81b4e1692" } ], "title": "netfilter: nft_compat: ebtables emulation must reject non-bridge targets", "x_generator": { "engine": "bippy-1.2.0" } } } }