364 lines
18 KiB
JSON
364 lines
18 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-46324",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-13T15:03:33.112Z",
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"datePublished": "2026-06-09T12:11:16.602Z",
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"dateUpdated": "2026-10-30T12:26:17.369Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-30T12:26:17.369Z"
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},
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"descriptions": [
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{
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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: use list_del_rcu for netlink hooks\n\nnft_netdev_unregister_hooks and __nft_unregister_flowtable_net_hooks need\nto use list_del_rcu(), this list can be walked by concurrent dumpers.\n\nAdd a new helper and use it consistently."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is in nf_tables netdev hook teardown reached only via Netfilter netlink (nft) syscalls—chain/flowtable updates, dumps, netns teardown, and netlink socket release—not from remote packet handling alone. Per kernel guidance, nftables/netfilter is Local (L).\nAC:L - Exploitation is a race between hook-list removal (`list_del()` + RCU free) and concurrent RCU walkers (`nft_dump_basechain_hook_list`, flowtable dump, or packet-path `list_for_each_entry_rcu`). An attacker with CAP_NET_ADMIN can drive both sides concurrently (e.g., one thread dumping chains/flowtables while another deletes hooks or tears down the netns).\nPR:L - All nf_tables netlink operations are gated by `netlink_net_capable(skb, CAP_NET_ADMIN)` in `nfnetlink_rcv()`. CAP_NET_ADMIN is obtainable by an unprivileged user via user+network namespaces (`unshare -Urn`), not real init-namespace root.\nUI:N - No victim interaction is required; the attacker triggers hook teardown and concurrent dumps or traffic entirely through their own netlink sockets and namespace lifecycle.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain; it does not inherently cross VM, container, or IOMMU boundaries.\nC:H - Using `list_del()` instead of `list_del_rcu()` on lists walked under `rcu_read_lock()` is a use-after-free/list-corruption bug; concurrent dumpers dereference `nft_hook` fields (e.g., `ifname`) after unlink/free, enabling arbitrary kernel memory read via heap grooming.\nI:H - The freed `nft_hook` kmalloc object can be reallocated and corrupted through the dangling RCU list pointers, providing a standard kernel UAF primitive exploitable for arbitrary write and control-flow hijacking.\nA:H - The race reliably causes kernel list corruption and use-after-free, leading to oops/panic during hook dumps, flowtable lookups, or netns cleanup; UAF in this path has inherent high availability impact even when not fully weaponized."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/netfilter/nf_tables_api.c"
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],
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{
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},
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{
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{
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"net/netfilter/nf_tables_api.c"
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"references": [
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"url": "https://git.kernel.org/stable/c/2405730fde96f7fa483a5862e323b681e0e09f54"
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"url": "https://git.kernel.org/stable/c/fe45e203527af8a2c0dc4c8a7b56c09c74b796c8"
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{
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"url": "https://git.kernel.org/stable/c/0f33e8ad6ac563ae2233dd7f75884e0ee010521d"
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{
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"url": "https://git.kernel.org/stable/c/f3224ee463f8f6f6ced7dcdf6081add4f8128527"
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}
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],
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"title": "netfilter: nf_tables: use list_del_rcu for netlink hooks",
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"x_generator": {
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"engine": "bippy-1.2.0"
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{
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-46324",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:22:09.898894Z"
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}
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-362",
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"description": "CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T19:36:58.611Z"
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}
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}
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]
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}
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} |