458 lines
23 KiB
JSON
458 lines
23 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-2026-64423",
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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": "2026-07-19T15:36:31.787Z",
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"datePublished": "2026-07-25T08:51:01.485Z",
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"dateUpdated": "2026-11-10T12:49:22.132Z"
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},
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"containers": {
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"cna": {
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T04:55:23.253Z"
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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\nipv4: igmp: remove multicast group from hash table on device destruction\n\nWhen a device is destroyed under RTNL, ip_mc_destroy_dev() iterates through\nthe multicast list and calls ip_ma_put() on each membership, scheduling\nthem for RCU reclamation. However, they are not unlinked from the device's\nmulticast hash table (mc_hash).\n\nSince the device remains published in dev->ip_ptr until after\nip_mc_destroy_dev() completes, concurrent RCU readers traversing mc_hash\ncan still locate and access the multicast group after its refcount is\ndecremented. If the RCU callback runs and frees the group while a reader is\naccessing it, a use-after-free occurs.\n\nFix this by unlinking the multicast group from mc_hash using\nip_mc_hash_remove() before scheduling it for reclamation.\n\nBUG: KASAN: slab-use-after-free in ip_check_mc_rcu+0x149/0x3f0\nRead of size 4 at addr ffff888009bf1408 by task mausezahn/2276\n\nCall Trace:\n <IRQ>\n dump_stack_lvl+0x67/0x90\n print_report+0x175/0x7c0\n kasan_report+0x147/0x180\n ip_check_mc_rcu+0x149/0x3f0\n udp_v4_early_demux+0x36d/0x12d0\n ip_rcv_finish_core+0xb8b/0x1390\n ip_rcv_finish+0x54/0x120\n NF_HOOK+0x213/0x2b0\n __netif_receive_skb+0x126/0x340\n process_backlog+0x4f2/0xf00\n __napi_poll+0x92/0x2c0\n net_rx_action+0x583/0xc60\n handle_softirqs+0x236/0x7f0\n do_softirq+0x57/0x80\n </IRQ>\n\nAllocated by task 2239:\n kasan_save_track+0x3e/0x80\n __kasan_kmalloc+0x72/0x90\n ____ip_mc_inc_group+0x31a/0xa40\n __ip_mc_join_group+0x334/0x3f0\n do_ip_setsockopt+0x16fa/0x2010\n ip_setsockopt+0x3f/0x90\n do_sock_setsockopt+0x1ad/0x300\n\nFreed by task 0:\n kasan_save_track+0x3e/0x80\n kasan_save_free_info+0x40/0x50\n __kasan_slab_free+0x3a/0x60\n __rcu_free_sheaf_prepare+0xd4/0x220\n rcu_free_sheaf+0x36/0x190\n rcu_core+0x8d9/0x12f0\n handle_softirqs+0x236/0x7f0"
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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 - An end-to-end attacker-controlled trigger requires local socket and netlink operations to create multicast memberships and concurrently destroy IPv4 device state; received multicast packets alone cannot initiate the necessary teardown. These operations are reachable inside an attacker-created user and network namespace.\nAC:L - The attacker can populate mc_hash, generate continuous multicast traffic, and repeatedly tear down IPv4 state, controlling both sides of the race. No victim-dependent timing or secret state is required.\nPR:L - Device teardown or invalid-MTU configuration requires CAP_NET_ADMIN in the target network namespace, while multicast joins and UDP sends are unprivileged. An ordinary user can obtain this namespace-scoped capability through unprivileged user and network namespaces.\nUI:N - Exploitation requires no action by another user once the attacker can execute locally and create the required namespace and traffic.\nS:U - The vulnerable code and resulting host-kernel compromise remain within the same security authority; this is conventional kernel privilege escalation rather than a guest-to-host escape.\nC:H - The stale kmalloc-256 ip_mc_list entry exposes reuse-controlled fields and pointers to kernel reads, making kernel-memory disclosure and broader read primitives plausible.\nI:H - Reallocation permits attacker-influenced object contents to drive spinlock writes and pointer traversal on freed memory, making heap corruption and control-flow hijacking defensible.\nA:H - The confirmed slab use-after-free can dereference corrupted hash pointers or operate on an invalid spinlock, causing a kernel oops, panic, general-protection fault, or hang."
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}
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}
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],
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"title": "ipv4: igmp: remove multicast group from hash table on device destruction",
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"version": "2.0.3",
|
|
"timestamp": "2026-10-16T15:40:31.437029Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"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": "2026-10-19T20:38:28.280Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |