516 lines
24 KiB
JSON
516 lines
24 KiB
JSON
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"cveId": "CVE-2026-23231",
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"dateReserved": "2026-01-13T15:37:45.988Z",
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"datePublished": "2026-03-04T12:58:42.029Z",
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: fix use-after-free in nf_tables_addchain()\n\nnf_tables_addchain() publishes the chain to table->chains via\nlist_add_tail_rcu() (in nft_chain_add()) before registering hooks.\nIf nf_tables_register_hook() then fails, the error path calls\nnft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy()\nwith no RCU grace period in between.\n\nThis creates two use-after-free conditions:\n\n 1) Control-plane: nf_tables_dump_chains() traverses table->chains\n under rcu_read_lock(). A concurrent dump can still be walking\n the chain when the error path frees it.\n\n 2) Packet path: for NFPROTO_INET, nf_register_net_hook() briefly\n installs the IPv4 hook before IPv6 registration fails. Packets\n entering nft_do_chain() via the transient IPv4 hook can still be\n dereferencing chain->blob_gen_X when the error path frees the\n chain.\n\nAdd synchronize_rcu() between nft_chain_del() and the chain destroy\nso that all RCU readers -- both dump threads and in-flight packet\nevaluation -- have finished before the chain is freed."
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{
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"lang": "en",
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"value": "AV:L - nftables is accessed via NETLINK_NETFILTER sockets requiring local system access through netlink; not remotely reachable.\nAC:L - The attacker can deterministically trigger hook registration failure by exhausting MAX_HOOK_COUNT (1024) on IPv6, then creating an INET chain. The attacker controls both sides of the race (chain creation and concurrent dump/packet injection).\nPR:L - Requires CAP_NET_ADMIN, which is obtainable by an unprivileged user through user namespaces (unshare -Urn) since netlink_net_capable checks against the namespace's user_ns.\nUI:N - No user interaction is required; the attacker can trigger the vulnerability entirely on their own.\nS:U - The vulnerability results in kernel memory corruption within the same security authority; no security boundary (VM, sandbox) is crossed.\nC:H - Use-after-free allows an attacker to reclaim the freed chain object with controlled data, enabling arbitrary kernel memory reads through the chain structure fields accessed by dump or packet processing.\nI:H - Use-after-free enables heap spraying to place attacker-controlled data in the freed chain object, allowing arbitrary write primitives and control flow hijacking through function pointers in the chain/basechain structures.\nA:H - The use-after-free reliably causes kernel crashes when the freed chain memory is accessed by concurrent dump threads or in-flight packet evaluation via nft_do_chain()."
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|
|
"content": {
|
|
"id": "CVE-2026-23231",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "total"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2026-06-16T20:18:23.569815Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-416",
|
|
"description": "CWE-416 Use After Free"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2026-10-19T18:35:39.463Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |