CVE-2026-23340 (GCVE-0-2026-23340)

Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-04-18 08:58
VLAI?
Title
net: sched: avoid qdisc_reset_all_tx_gt() vs dequeue race for lockless qdiscs
Summary
In the Linux kernel, the following vulnerability has been resolved: net: sched: avoid qdisc_reset_all_tx_gt() vs dequeue race for lockless qdiscs When shrinking the number of real tx queues, netif_set_real_num_tx_queues() calls qdisc_reset_all_tx_gt() to flush qdiscs for queues which will no longer be used. qdisc_reset_all_tx_gt() currently serializes qdisc_reset() with qdisc_lock(). However, for lockless qdiscs, the dequeue path is serialized by qdisc_run_begin/end() using qdisc->seqlock instead, so qdisc_reset() can run concurrently with __qdisc_run() and free skbs while they are still being dequeued, leading to UAF. This can easily be reproduced on e.g. virtio-net by imposing heavy traffic while frequently changing the number of queue pairs: iperf3 -ub0 -c $peer -t 0 & while :; do ethtool -L eth0 combined 1 ethtool -L eth0 combined 2 done With KASAN enabled, this leads to reports like: BUG: KASAN: slab-use-after-free in __qdisc_run+0x133f/0x1760 ... Call Trace: <TASK> ... __qdisc_run+0x133f/0x1760 __dev_queue_xmit+0x248f/0x3550 ip_finish_output2+0xa42/0x2110 ip_output+0x1a7/0x410 ip_send_skb+0x2e6/0x480 udp_send_skb+0xb0a/0x1590 udp_sendmsg+0x13c9/0x1fc0 ... </TASK> Allocated by task 1270 on cpu 5 at 44.558414s: ... alloc_skb_with_frags+0x84/0x7c0 sock_alloc_send_pskb+0x69a/0x830 __ip_append_data+0x1b86/0x48c0 ip_make_skb+0x1e8/0x2b0 udp_sendmsg+0x13a6/0x1fc0 ... Freed by task 1306 on cpu 3 at 44.558445s: ... kmem_cache_free+0x117/0x5e0 pfifo_fast_reset+0x14d/0x580 qdisc_reset+0x9e/0x5f0 netif_set_real_num_tx_queues+0x303/0x840 virtnet_set_channels+0x1bf/0x260 [virtio_net] ethnl_set_channels+0x684/0xae0 ethnl_default_set_doit+0x31a/0x890 ... Serialize qdisc_reset_all_tx_gt() against the lockless dequeue path by taking qdisc->seqlock for TCQ_F_NOLOCK qdiscs, matching the serialization model already used by dev_reset_queue(). Additionally clear QDISC_STATE_NON_EMPTY after reset so the qdisc state reflects an empty queue, avoiding needless re-scheduling.
Severity ?
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6b3ba9146fe64b9bebb6346c9dcfe3b4851de2d7 , < 5bb27ad54d12de67e457d7d251198e361bef835e (git)
Affected: 6b3ba9146fe64b9bebb6346c9dcfe3b4851de2d7 , < 7594467c49bfc2f4644dee0415ac2290db11fa0d (git)
Affected: 6b3ba9146fe64b9bebb6346c9dcfe3b4851de2d7 , < dbd58b0730aa06ab6ad26079cf9a5b6b58e7e750 (git)
Affected: 6b3ba9146fe64b9bebb6346c9dcfe3b4851de2d7 , < 5bc4e69306ed7ae02232eb4c0b23ed621a26d504 (git)
Affected: 6b3ba9146fe64b9bebb6346c9dcfe3b4851de2d7 , < 8314944cc3bdeaa5a73e6f8a8cf0d94822e625cb (git)
Affected: 6b3ba9146fe64b9bebb6346c9dcfe3b4851de2d7 , < c69df4e0524f8de8e176ba389acd83e85f5f49d0 (git)
Affected: 6b3ba9146fe64b9bebb6346c9dcfe3b4851de2d7 , < 7f083faf59d14c04e01ec05a7507f036c965acf8 (git)
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    Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.77 , ≤ 6.12.* (semver)
Unaffected: 6.18.17 , ≤ 6.18.* (semver)
Unaffected: 6.19.7 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: sched: avoid qdisc_reset_all_tx_gt() vs dequeue race for lockless qdiscs\n\nWhen shrinking the number of real tx queues,\nnetif_set_real_num_tx_queues() calls qdisc_reset_all_tx_gt() to flush\nqdiscs for queues which will no longer be used.\n\nqdisc_reset_all_tx_gt() currently serializes qdisc_reset() with\nqdisc_lock(). However, for lockless qdiscs, the dequeue path is\nserialized by qdisc_run_begin/end() using qdisc-\u003eseqlock instead, so\nqdisc_reset() can run concurrently with __qdisc_run() and free skbs\nwhile they are still being dequeued, leading to UAF.\n\nThis can easily be reproduced on e.g. virtio-net by imposing heavy\ntraffic while frequently changing the number of queue pairs:\n\n  iperf3 -ub0 -c $peer -t 0 \u0026\n  while :; do\n    ethtool -L eth0 combined 1\n    ethtool -L eth0 combined 2\n  done\n\nWith KASAN enabled, this leads to reports like:\n\n  BUG: KASAN: slab-use-after-free in __qdisc_run+0x133f/0x1760\n  ...\n  Call Trace:\n   \u003cTASK\u003e\n   ...\n   __qdisc_run+0x133f/0x1760\n   __dev_queue_xmit+0x248f/0x3550\n   ip_finish_output2+0xa42/0x2110\n   ip_output+0x1a7/0x410\n   ip_send_skb+0x2e6/0x480\n   udp_send_skb+0xb0a/0x1590\n   udp_sendmsg+0x13c9/0x1fc0\n   ...\n   \u003c/TASK\u003e\n\n  Allocated by task 1270 on cpu 5 at 44.558414s:\n   ...\n   alloc_skb_with_frags+0x84/0x7c0\n   sock_alloc_send_pskb+0x69a/0x830\n   __ip_append_data+0x1b86/0x48c0\n   ip_make_skb+0x1e8/0x2b0\n   udp_sendmsg+0x13a6/0x1fc0\n   ...\n\n  Freed by task 1306 on cpu 3 at 44.558445s:\n   ...\n   kmem_cache_free+0x117/0x5e0\n   pfifo_fast_reset+0x14d/0x580\n   qdisc_reset+0x9e/0x5f0\n   netif_set_real_num_tx_queues+0x303/0x840\n   virtnet_set_channels+0x1bf/0x260 [virtio_net]\n   ethnl_set_channels+0x684/0xae0\n   ethnl_default_set_doit+0x31a/0x890\n   ...\n\nSerialize qdisc_reset_all_tx_gt() against the lockless dequeue path by\ntaking qdisc-\u003eseqlock for TCQ_F_NOLOCK qdiscs, matching the\nserialization model already used by dev_reset_queue().\n\nAdditionally clear QDISC_STATE_NON_EMPTY after reset so the qdisc state\nreflects an empty queue, avoiding needless re-scheduling."
        }
      ],
      "metrics": [
        {
          "cvssV3_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",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-18T08:58:04.016Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        {
          "url": "https://git.kernel.org/stable/c/5bb27ad54d12de67e457d7d251198e361bef835e"
        },
        {
          "url": "https://git.kernel.org/stable/c/7594467c49bfc2f4644dee0415ac2290db11fa0d"
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        },
        {
          "url": "https://git.kernel.org/stable/c/7f083faf59d14c04e01ec05a7507f036c965acf8"
        }
      ],
      "title": "net: sched: avoid qdisc_reset_all_tx_gt() vs dequeue race for lockless qdiscs",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23340",
    "datePublished": "2026-03-25T10:27:28.728Z",
    "dateReserved": "2026-01-13T15:37:45.998Z",
    "dateUpdated": "2026-04-18T08:58:04.016Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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    "epss": {
      "cve": "CVE-2026-23340",
      "date": "2026-04-25",
      "epss": "0.00013",
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    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-23340\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:31.837\",\"lastModified\":\"2026-04-23T21:17:07.217\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: sched: avoid qdisc_reset_all_tx_gt() vs dequeue race for lockless qdiscs\\n\\nWhen shrinking the number of real tx queues,\\nnetif_set_real_num_tx_queues() calls qdisc_reset_all_tx_gt() to flush\\nqdiscs for queues which will no longer be used.\\n\\nqdisc_reset_all_tx_gt() currently serializes qdisc_reset() with\\nqdisc_lock(). However, for lockless qdiscs, the dequeue path is\\nserialized by qdisc_run_begin/end() using qdisc-\u003eseqlock instead, so\\nqdisc_reset() can run concurrently with __qdisc_run() and free skbs\\nwhile they are still being dequeued, leading to UAF.\\n\\nThis can easily be reproduced on e.g. virtio-net by imposing heavy\\ntraffic while frequently changing the number of queue pairs:\\n\\n  iperf3 -ub0 -c $peer -t 0 \u0026\\n  while :; do\\n    ethtool -L eth0 combined 1\\n    ethtool -L eth0 combined 2\\n  done\\n\\nWith KASAN enabled, this leads to reports like:\\n\\n  BUG: KASAN: slab-use-after-free in __qdisc_run+0x133f/0x1760\\n  ...\\n  Call Trace:\\n   \u003cTASK\u003e\\n   ...\\n   __qdisc_run+0x133f/0x1760\\n   __dev_queue_xmit+0x248f/0x3550\\n   ip_finish_output2+0xa42/0x2110\\n   ip_output+0x1a7/0x410\\n   ip_send_skb+0x2e6/0x480\\n   udp_send_skb+0xb0a/0x1590\\n   udp_sendmsg+0x13c9/0x1fc0\\n   ...\\n   \u003c/TASK\u003e\\n\\n  Allocated by task 1270 on cpu 5 at 44.558414s:\\n   ...\\n   alloc_skb_with_frags+0x84/0x7c0\\n   sock_alloc_send_pskb+0x69a/0x830\\n   __ip_append_data+0x1b86/0x48c0\\n   ip_make_skb+0x1e8/0x2b0\\n   udp_sendmsg+0x13a6/0x1fc0\\n   ...\\n\\n  Freed by task 1306 on cpu 3 at 44.558445s:\\n   ...\\n   kmem_cache_free+0x117/0x5e0\\n   pfifo_fast_reset+0x14d/0x580\\n   qdisc_reset+0x9e/0x5f0\\n   netif_set_real_num_tx_queues+0x303/0x840\\n   virtnet_set_channels+0x1bf/0x260 [virtio_net]\\n   ethnl_set_channels+0x684/0xae0\\n   ethnl_default_set_doit+0x31a/0x890\\n   ...\\n\\nSerialize qdisc_reset_all_tx_gt() against the lockless dequeue path by\\ntaking qdisc-\u003eseqlock for TCQ_F_NOLOCK qdiscs, matching the\\nserialization model already used by dev_reset_queue().\\n\\nAdditionally clear QDISC_STATE_NON_EMPTY after reset so the qdisc state\\nreflects an empty queue, avoiding needless re-scheduling.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad:\\n\\nnet: sched: evitar la condici\u00f3n de carrera entre qdisc_reset_all_tx_gt() y la eliminaci\u00f3n de la cola para qdiscs sin bloqueo\\n\\nAl reducir el n\u00famero de colas de transmisi\u00f3n (tx) reales, netif_set_real_num_tx_queues() llama a qdisc_reset_all_tx_gt() para vaciar los qdiscs de las colas que ya no se utilizar\u00e1n.\\n\\nActualmente, qdisc_reset_all_tx_gt() serializa qdisc_reset() con qdisc_lock(). Sin embargo, para los qdiscs sin bloqueo, la ruta de eliminaci\u00f3n de la cola se serializa mediante qdisc_run_begin/end() usando qdisc-\u0026gt;seqlock en su lugar, por lo que qdisc_reset() puede ejecutarse concurrentemente con __qdisc_run() y liberar skbs mientras a\u00fan se est\u00e1n eliminando de la cola, lo que lleva a un uso despu\u00e9s de liberaci\u00f3n.\\n\\nEsto se puede reproducir f\u00e1cilmente, por ejemplo, en virtio-net, imponiendo un tr\u00e1fico intenso mientras se cambia frecuentemente el n\u00famero de pares de colas:\\n\\n  iperf3 -ub0 -c $peer -t 0 \u0026amp;\\n  while :; do\\n    ethtool -L eth0 combined 1\\n    ethtool -L eth0 combined 2\\n  done\\n\\nCon KASAN habilitado, esto lleva a informes como:\\n\\n  BUG: KASAN: uso despu\u00e9s de liberaci\u00f3n de slab en __qdisc_run+0x133f/0x1760\\n  ...\\n  Rastro de Llamada:\\n   \\n   ...\\n   __qdisc_run+0x133f/0x1760\\n   __dev_queue_xmit+0x248f/0x3550\\n   ip_finish_output2+0xa42/0x2110\\n   ip_output+0x1a7/0x410\\n   ip_send_skb+0x2e6/0x480\\n   udp_send_skb+0xb0a/0x1590\\n   udp_sendmsg+0x13c9/0x1fc0\\n   ...\\n   \\n\\n  Asignado por la tarea 1270 en la cpu 5 a los 44.558414s:\\n   ...\\n   alloc_skb_with_frags+0x84/0x7c0\\n   sock_alloc_send_pskb+0x69a/0x830\\n   __ip_append_data+0x1b86/0x48c0\\n   ip_make_skb+0x1e8/0x2b0\\n   udp_sendmsg+0x13a6/0x1fc0\\n   ...\\n\\n  Liberado por la tarea 1306 en la cpu 3 a los 44.558445s:\\n   ...\\n   kmem_cache_free+0x117/0x5e0\\n   pfifo_fast_reset+0x14d/0x580\\n   qdisc_reset+0x9e/0x5f0\\n   netif_set_real_num_tx_queues+0x303/0x840\\n   virtnet_set_channels+0x1bf/0x260 [virtio_net]\\n   ethnl_set_channels+0x684/0xae0\\n   ethnl_default_set_doit+0x31a/0x890\\n   ...\\n\\nSerializar qdisc_reset_all_tx_gt() contra la ruta de eliminaci\u00f3n de la cola sin bloqueo tomando qdisc-\u0026gt;seqlock para los qdiscs TCQ_F_NOLOCK, coincidiendo con el modelo de serializaci\u00f3n ya utilizado por dev_reset_queue().\\n\\nAdem\u00e1s, borrar QDISC_STATE_NON_EMPTY despu\u00e9s del reinicio para que el estado del qdisc refleje una cola vac\u00eda, evitando una reprogramaci\u00f3n innecesaria.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.16.1\",\"versionEndExcluding\":\"5.15.203\",\"matchCriteriaId\":\"2084F3CA-9155-4C25-AE7F-A6BC24B53E24\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.167\",\"matchCriteriaId\":\"2EDC6BAF-B710-4E26-B6AA-D68922EE7B43\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.130\",\"matchCriteriaId\":\"C57BB918-DF28-46B3-94F7-144176841267\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.77\",\"matchCriteriaId\":\"B3D12E00-E42D-4056-B354-BAD4903C03A5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.17\",\"matchCriteriaId\":\"A5E006E4-59C7-43C1-9231-62A72219F2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"6.19.7\",\"matchCriteriaId\":\"69245D10-0B71-485E-80C3-A64F077004D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:4.16:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"F60469AF-0A23-41D3-BC6A-C0D9A45A2CBC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"F253B622-8837-4245-BCE5-A7BF8FC76A16\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"F666C8D8-6538-46D4-B318-87610DE64C34\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"02259FDA-961B-47BC-AE7F-93D7EC6E90C2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"58A9FEFF-C040-420D-8F0A-BFDAAA1DF258\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"1D2315C0-D46F-4F85-9754-F9E5E11374A6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"512EE3A8-A590-4501-9A94-5D4B268D6138\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5bb27ad54d12de67e457d7d251198e361bef835e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5bc4e69306ed7ae02232eb4c0b23ed621a26d504\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7594467c49bfc2f4644dee0415ac2290db11fa0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7f083faf59d14c04e01ec05a7507f036c965acf8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8314944cc3bdeaa5a73e6f8a8cf0d94822e625cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c69df4e0524f8de8e176ba389acd83e85f5f49d0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/dbd58b0730aa06ab6ad26079cf9a5b6b58e7e750\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}"
  }
}


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Taxonomy of the tags.




Sightings

Author Source Type Date

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.