CVE-2026-43454 (GCVE-0-2026-43454)
Vulnerability from cvelistv5
Published
2026-05-08 14:22
Modified
2026-08-05 12:28
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nf_tables: Fix for duplicate device in netdev hooks
When handling NETDEV_REGISTER notification, duplicate device
registration must be avoided since the device may have been added by
nft_netdev_hook_alloc() already when creating the hook.
References
Impacted products
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/netfilter/nf_tables_api.c",
"net/netfilter/nft_chain_filter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "6d2a95c6890577cc3eab2b20018e16850d7fb094",
"status": "affected",
"version": "a331b78a552551d0e404e58e6390b1c828d6af8f",
"versionType": "git"
},
{
"lessThan": "2041cdb078041611510fc189410bc70b29f688fb",
"status": "affected",
"version": "a331b78a552551d0e404e58e6390b1c828d6af8f",
"versionType": "git"
},
{
"lessThan": "b7cdc5a97d02c943f4bdde4d5767ad0c13cad92b",
"status": "affected",
"version": "a331b78a552551d0e404e58e6390b1c828d6af8f",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/netfilter/nf_tables_api.c",
"net/netfilter/nft_chain_filter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.16"
},
{
"lessThan": "6.16",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.19",
"versionStartIncluding": "6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.9",
"versionStartIncluding": "6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "6.16",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:28:02.179Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43454",
"datePublished": "2026-05-08T14:22:18.719Z",
"dateReserved": "2026-05-01T14:12:56.010Z",
"dateUpdated": "2026-08-05T12:28:02.179Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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