{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-43454",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-05-01T14:12:56.010Z",
        "datePublished": "2026-05-08T14:22:18.719Z",
        "dateUpdated": "2026-08-05T12:28:02.179Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-05T12:28:02.179Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: Fix for duplicate device in netdev hooks\n\nWhen handling NETDEV_REGISTER notification, duplicate device\nregistration must be avoided since the device may have been added by\nnft_netdev_hook_alloc() already when creating the hook."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The vulnerable nf_tables netdev hook path is reached through local NETLINK_NETFILTER/nfnetlink configuration messages and local netdevice lifecycle operations, not by remote packets alone.\nAC:L - The attacker can create/update nftables netdev hooks and create/unregister matching devices from controlled local threads; any race/timing involved is attacker-controlled and repeatable.\nPR:L - nfnetlink requires CAP_NET_ADMIN over the target network namespace, but nftables/netfilter and netdevice operations are reachable by an unprivileged local user via user and network namespaces on affected deployments.\nUI:N - No victim action is required after the attacker has local execution; the attacker sends netlink requests and triggers device unregister/release paths directly.\nS:U - The bug corrupts kernel/netfilter state within the same kernel security authority; it is a standard local kernel privilege escalation/DoS class issue, not a VM or sandbox boundary change.\nC:H - The flaw leaves stale nf_hook_ops entries referencing a freed net_device, producing a use-after-free; per kernel scoring guidance, UAF conditions are treated as capable of high confidentiality impact.\nI:H - The stale hook/device pointer can be driven through unregister paths after attacker-controlled freeing and heap reuse, making this a kernel UAF with potential write/control-flow exploitation.\nA:H - The syzbot report shows a KASAN use-after-free in nf_hook_entry_head during hook unregister, and the condition can crash/oops the kernel."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/netfilter/nf_tables_api.c",
                        "net/netfilter/nft_chain_filter.c"
                    ],
                    "versions": [
                        {
                            "version": "a331b78a552551d0e404e58e6390b1c828d6af8f",
                            "lessThan": "6d2a95c6890577cc3eab2b20018e16850d7fb094",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a331b78a552551d0e404e58e6390b1c828d6af8f",
                            "lessThan": "2041cdb078041611510fc189410bc70b29f688fb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "a331b78a552551d0e404e58e6390b1c828d6af8f",
                            "lessThan": "b7cdc5a97d02c943f4bdde4d5767ad0c13cad92b",
                            "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/nf_tables_api.c",
                        "net/netfilter/nft_chain_filter.c"
                    ],
                    "versions": [
                        {
                            "version": "6.16",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.16",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.19",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.9",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "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": "6.16",
                                    "versionEndExcluding": "6.18.19"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "6.19.9"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.16",
                                    "versionEndExcluding": "7.0"
                                }
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            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/6d2a95c6890577cc3eab2b20018e16850d7fb094"
                },
                {
                    "url": "https://git.kernel.org/stable/c/2041cdb078041611510fc189410bc70b29f688fb"
                },
                {
                    "url": "https://git.kernel.org/stable/c/b7cdc5a97d02c943f4bdde4d5767ad0c13cad92b"
                }
            ],
            "title": "netfilter: nf_tables: Fix for duplicate device in netdev hooks",
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}