FKIE_CVE-2024-35934

Vulnerability from fkie_nvd - Published: 2024-05-19 11:15 - Updated: 2025-12-17 03:40
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list() Many syzbot reports show extreme rtnl pressure, and many of them hint that smc acquires rtnl in netns creation for no good reason [1] This patch returns early from smc_pnet_net_init() if there is no netdevice yet. I am not even sure why smc_pnet_create_pnetids_list() even exists, because smc_pnet_netdev_event() is also calling smc_pnet_add_base_pnetid() when handling NETDEV_UP event. [1] extract of typical syzbot reports 2 locks held by syz-executor.3/12252: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.4/12253: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.1/12257: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.2/12261: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.0/12265: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.3/12268: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.4/12271: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.1/12274: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.2/12280: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00af2aa93b76b1bade471ad0d0525d4d29ca5cc0Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e920422e7104928f760fc0e12b6d65ab097a2e7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2e6bffc0388526ed10406040279a693d62b36ecPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9117dc783c0ab0a3866812f70e07bf2ea071ac4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc4d1ebca11b4f194e262326bd45938e857c59d2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d7ee3bf0caf599c14db0bf4af7aacd6206ef8a23Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/00af2aa93b76b1bade471ad0d0525d4d29ca5cc0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6e920422e7104928f760fc0e12b6d65ab097a2e7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a2e6bffc0388526ed10406040279a693d62b36ecPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b9117dc783c0ab0a3866812f70e07bf2ea071ac4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bc4d1ebca11b4f194e262326bd45938e857c59d2Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d7ee3bf0caf599c14db0bf4af7aacd6206ef8a23Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlMailing List, Third Party Advisory
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
debian debian_linux 10.0
To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list()\n\nMany syzbot reports show extreme rtnl pressure, and many of them hint\nthat smc acquires rtnl in netns creation for no good reason [1]\n\nThis patch returns early from smc_pnet_net_init()\nif there is no netdevice yet.\n\nI am not even sure why smc_pnet_create_pnetids_list() even exists,\nbecause smc_pnet_netdev_event() is also calling\nsmc_pnet_add_base_pnetid() when handling NETDEV_UP event.\n\n[1] extract of typical syzbot reports\n\n2 locks held by syz-executor.3/12252:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.4/12253:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.1/12257:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.2/12261:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.0/12265:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.3/12268:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.4/12271:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.1/12274:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.2/12280:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: reduce la presi\u00f3n rtnl en smc_pnet_create_pnetids_list() Muchos informes de syzbot muestran una presi\u00f3n rtnl extrema, y muchos de ellos insin\u00faan que smc adquiere rtnl en la creaci\u00f3n de netns sin una buena raz\u00f3n [1] Este parche regresa temprano desde smc_pnet_net_init() si a\u00fan no hay un netdevice. Ni siquiera estoy seguro de por qu\u00e9 existe smc_pnet_create_pnetids_list(), porque smc_pnet_netdev_event() tambi\u00e9n llama a smc_pnet_add_base_pnetid() cuando maneja el evento NETDEV_UP. [1] extracto de informes t\u00edpicos de syzbot 2 bloqueos mantenidos por syz-executor.3/12252: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core /net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+ .+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.4/12253: #0: ffffffff8f369610 (pernet_ops_rwsem){+++ +}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/ smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.1/12257: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex ){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en : smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.2/12261: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns +0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1 : ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.0/12265: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3 }, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet. c:878 2 bloqueos retenidos por syz-executor.3/12268: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c: 491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}- {3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.4/12271: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3 :3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c :809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.1 /12274: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+ .}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/ 0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.2/12280: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net /core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex) {+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878"
    }
  ],
  "id": "CVE-2024-35934",
  "lastModified": "2025-12-17T03:40:48.300",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-05-19T11:15:49.343",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/00af2aa93b76b1bade471ad0d0525d4d29ca5cc0"
    },
    {
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    {
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    {
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      "url": "https://git.kernel.org/stable/c/d7ee3bf0caf599c14db0bf4af7aacd6206ef8a23"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/00af2aa93b76b1bade471ad0d0525d4d29ca5cc0"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/6e920422e7104928f760fc0e12b6d65ab097a2e7"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/a2e6bffc0388526ed10406040279a693d62b36ec"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "url": "https://git.kernel.org/stable/c/b9117dc783c0ab0a3866812f70e07bf2ea071ac4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
    {
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    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Tags
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.