CVE-2026-64423 (GCVE-0-2026-64423)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:51 – Updated: 2026-07-25 08:51
VLAI
Title
ipv4: igmp: remove multicast group from hash table on device destruction
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 , < 412ba7def06ffe974ba9a1d862b022362c54ffa5 (git)
Affected: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 , < c6cb5f8ebe1c1a78710c19f102db9fe48b9e6ba9 (git)
Affected: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 , < 5f42729d74bd6c61306d864423290d92962de4e1 (git)
Affected: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 , < 76d030ac95e17f91d69a595f17ebc5979700cf9a (git)
Affected: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 , < 8820b530cb2388503d7418228d03ba074bf7a03e (git)
Affected: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 , < 2ca18df1c2611f70eb3eb487e02ae85eb703b284 (git)
Affected: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 , < f91883031e5a62877a29ce139442973cbea769f1 (git)
Affected: e9897071350bd9d94a56b5b6f79c85b1a98fc7e7 , < 7993211bde166471dffac074dc965489f86531f8 (git)
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Linux Linux Affected: 3.11
Unaffected: 0 , < 3.11 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
            "net/ipv4/igmp.c"
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      "cpeApplicability": [
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      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:51:01.485Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "ipv4: igmp: remove multicast group from hash table on device destruction",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64423",
    "datePublished": "2026-07-25T08:51:01.485Z",
    "dateReserved": "2026-07-19T15:36:31.787Z",
    "dateUpdated": "2026-07-25T08:51:01.485Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64423",
      "date": "2026-07-26",
      "epss": "0.00177",
      "percentile": "0.07472"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64423\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:26.350\",\"lastModified\":\"2026-07-25T10:17:26.350\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv4/igmp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv4/igmp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.11\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.11\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2ca18df1c2611f70eb3eb487e02ae85eb703b284\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/412ba7def06ffe974ba9a1d862b022362c54ffa5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f42729d74bd6c61306d864423290d92962de4e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/76d030ac95e17f91d69a595f17ebc5979700cf9a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7993211bde166471dffac074dc965489f86531f8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8820b530cb2388503d7418228d03ba074bf7a03e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c6cb5f8ebe1c1a78710c19f102db9fe48b9e6ba9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f91883031e5a62877a29ce139442973cbea769f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:37Z",
      "cve": "CVE-2026-64423",
      "id": "CVE-2026-64423",
      "initial_release_date": "2026-07-25T15:59:37Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64423",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64423.json",
      "version": "2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.