CVE-2026-64423 (GCVE-0-2026-64423)
Vulnerability from cvelistv5
Published
2026-07-25 08:51
Modified
2026-10-19 20:38
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv4: igmp: remove multicast group from hash table on device destruction When a device is destroyed under RTNL, ip_mc_destroy_dev() iterates through the multicast list and calls ip_ma_put() on each membership, scheduling them for RCU reclamation. However, they are not unlinked from the device's multicast hash table (mc_hash). Since the device remains published in dev->ip_ptr until after ip_mc_destroy_dev() completes, concurrent RCU readers traversing mc_hash can still locate and access the multicast group after its refcount is decremented. If the RCU callback runs and frees the group while a reader is accessing it, a use-after-free occurs. Fix this by unlinking the multicast group from mc_hash using ip_mc_hash_remove() before scheduling it for reclamation. BUG: KASAN: slab-use-after-free in ip_check_mc_rcu+0x149/0x3f0 Read of size 4 at addr ffff888009bf1408 by task mausezahn/2276 Call Trace: <IRQ> dump_stack_lvl+0x67/0x90 print_report+0x175/0x7c0 kasan_report+0x147/0x180 ip_check_mc_rcu+0x149/0x3f0 udp_v4_early_demux+0x36d/0x12d0 ip_rcv_finish_core+0xb8b/0x1390 ip_rcv_finish+0x54/0x120 NF_HOOK+0x213/0x2b0 __netif_receive_skb+0x126/0x340 process_backlog+0x4f2/0xf00 __napi_poll+0x92/0x2c0 net_rx_action+0x583/0xc60 handle_softirqs+0x236/0x7f0 do_softirq+0x57/0x80 </IRQ> Allocated by task 2239: kasan_save_track+0x3e/0x80 __kasan_kmalloc+0x72/0x90 ____ip_mc_inc_group+0x31a/0xa40 __ip_mc_join_group+0x334/0x3f0 do_ip_setsockopt+0x16fa/0x2010 ip_setsockopt+0x3f/0x90 do_sock_setsockopt+0x1ad/0x300 Freed by task 0: kasan_save_track+0x3e/0x80 kasan_save_free_info+0x40/0x50 __kasan_slab_free+0x3a/0x60 __rcu_free_sheaf_prepare+0xd4/0x220 rcu_free_sheaf+0x36/0x190 rcu_core+0x8d9/0x12f0 handle_softirqs+0x236/0x7f0
References
Impacted products
Vendor Product Version
Linux Linux Version: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7
Version: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7
Version: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7
Version: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7
Version: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7
Version: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7
Version: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7
Version: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7
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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\u0027s\nmulticast hash table (mc_hash).\n\nSince the device remains published in dev-\u003eip_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 \u003cIRQ\u003e\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 \u003c/IRQ\u003e\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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              "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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    "vulnrichment": {
      "containers": "{\"adp\": [{\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.6\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Siemens\", \"product\": \"SIPLUS S7-1500 CPU 1518-4 PN/DP MFP\", \"versions\": [{\"status\": \"affected\", \"version\": \"V3.1.7\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-019113.html\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-457936.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-10-15T01:23:48.509Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-64423\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"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\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:40:31.988Z\"}}], \"cna\": {\"title\": \"ipv4: igmp: remove multicast group from hash table on device destruction\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"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\"}, \"scenarios\": [{\"lang\": \"en\", \"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.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e9897071350bd9d94a56b5b6f79c85b1a98fc7e7\", \"lessThan\": \"412ba7def06ffe974ba9a1d862b022362c54ffa5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e9897071350bd9d94a56b5b6f79c85b1a98fc7e7\", \"lessThan\": \"c6cb5f8ebe1c1a78710c19f102db9fe48b9e6ba9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e9897071350bd9d94a56b5b6f79c85b1a98fc7e7\", \"lessThan\": \"5f42729d74bd6c61306d864423290d92962de4e1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e9897071350bd9d94a56b5b6f79c85b1a98fc7e7\", \"lessThan\": \"76d030ac95e17f91d69a595f17ebc5979700cf9a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e9897071350bd9d94a56b5b6f79c85b1a98fc7e7\", \"lessThan\": \"8820b530cb2388503d7418228d03ba074bf7a03e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e9897071350bd9d94a56b5b6f79c85b1a98fc7e7\", \"lessThan\": \"2ca18df1c2611f70eb3eb487e02ae85eb703b284\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e9897071350bd9d94a56b5b6f79c85b1a98fc7e7\", \"lessThan\": \"f91883031e5a62877a29ce139442973cbea769f1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e9897071350bd9d94a56b5b6f79c85b1a98fc7e7\", \"lessThan\": \"7993211bde166471dffac074dc965489f86531f8\", \"versionType\": \"git\"}], \"programFiles\": [\"net/ipv4/igmp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"3.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.96\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.39\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/igmp.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/412ba7def06ffe974ba9a1d862b022362c54ffa5\"}, {\"url\": \"https://git.kernel.org/stable/c/c6cb5f8ebe1c1a78710c19f102db9fe48b9e6ba9\"}, {\"url\": \"https://git.kernel.org/stable/c/5f42729d74bd6c61306d864423290d92962de4e1\"}, {\"url\": \"https://git.kernel.org/stable/c/76d030ac95e17f91d69a595f17ebc5979700cf9a\"}, {\"url\": \"https://git.kernel.org/stable/c/8820b530cb2388503d7418228d03ba074bf7a03e\"}, {\"url\": \"https://git.kernel.org/stable/c/2ca18df1c2611f70eb3eb487e02ae85eb703b284\"}, {\"url\": \"https://git.kernel.org/stable/c/f91883031e5a62877a29ce139442973cbea769f1\"}, {\"url\": \"https://git.kernel.org/stable/c/7993211bde166471dffac074dc965489f86531f8\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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\u0027s\\nmulticast hash table (mc_hash).\\n\\nSince the device remains published in dev-\u003eip_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 \u003cIRQ\u003e\\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 \u003c/IRQ\u003e\\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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.96\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.39\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.4\", \"versionStartIncluding\": \"3.11\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"3.11\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T04:55:23.253Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-64423\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:38:28.280Z\", \"dateReserved\": \"2026-07-19T15:36:31.787Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-25T08:51:01.485Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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