CVE-2026-31546 (GCVE-0-2026-31546)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:33 – Updated: 2026-05-11 22:10
VLAI
Title
net: bonding: fix NULL deref in bond_debug_rlb_hash_show
Summary
In the Linux kernel, the following vulnerability has been resolved: net: bonding: fix NULL deref in bond_debug_rlb_hash_show rlb_clear_slave intentionally keeps RLB hash-table entries on the rx_hashtbl_used_head list with slave set to NULL when no replacement slave is available. However, bond_debug_rlb_hash_show visites client_info->slave without checking if it's NULL. Other used-list iterators in bond_alb.c already handle this NULL-slave state safely: - rlb_update_client returns early on !client_info->slave - rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance compare slave values before visiting - lb_req_update_subnet_clients continues if slave is NULL The following NULL deref crash can be trigger in bond_debug_rlb_hash_show: [ 1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41) [ 1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286 [ 1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204 [ 1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078 [ 1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000 [ 1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0 [ 1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8 [ 1.294864] FS: 0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000 [ 1.295239] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0 [ 1.295897] Call Trace: [ 1.296134] seq_read_iter (fs/seq_file.c:231) [ 1.296341] seq_read (fs/seq_file.c:164) [ 1.296493] full_proxy_read (fs/debugfs/file.c:378 (discriminator 1)) [ 1.296658] vfs_read (fs/read_write.c:572) [ 1.296981] ksys_read (fs/read_write.c:717) [ 1.297132] do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1)) [ 1.297325] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Add a NULL check and print "(none)" for entries with no assigned slave.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 , < 19f0fd87df0e5746b24f5caa465a66a8c6e6e241 (git)
Affected: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 , < edacf1613f7b26423ebfa8b2892e7453c4235354 (git)
Affected: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 , < 2ec2c777f357a83c3d503d8d9370c90b60f0ae63 (git)
Affected: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 , < 0a3f8cd3f370247ded14d38d216b49dd30eade76 (git)
Affected: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 , < 6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4 (git)
Affected: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 , < 017d674cf6930e9586a29ee808c7ca09d1396d07 (git)
Affected: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 , < ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c (git)
Affected: caafa84251b886feb6cdf23d50e2cc99dcdaaaf3 , < 605b52497bf89b3b154674deb135da98f916e390 (git)
Create a notification for this product.
Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
  "containers": {
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/bonding/bond_debugfs.c"
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          "vendor": "Linux",
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            },
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              "status": "unaffected",
              "version": "0",
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.20",
              "versionType": "semver"
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              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.10",
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            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bonding: fix NULL deref in bond_debug_rlb_hash_show\n\nrlb_clear_slave intentionally keeps RLB hash-table entries on\nthe rx_hashtbl_used_head list with slave set to NULL when no\nreplacement slave is available. However, bond_debug_rlb_hash_show\nvisites client_info-\u003eslave without checking if it\u0027s NULL.\n\nOther used-list iterators in bond_alb.c already handle this NULL-slave\nstate safely:\n\n- rlb_update_client returns early on !client_info-\u003eslave\n- rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance\ncompare slave values before visiting\n- lb_req_update_subnet_clients continues if slave is NULL\n\nThe following NULL deref crash can be trigger in\nbond_debug_rlb_hash_show:\n\n[    1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000\n[    1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41)\n[    1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286\n[    1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204\n[    1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078\n[    1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000\n[    1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0\n[    1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8\n[    1.294864] FS:  0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000\n[    1.295239] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[    1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0\n[    1.295897] Call Trace:\n[    1.296134]  seq_read_iter (fs/seq_file.c:231)\n[    1.296341]  seq_read (fs/seq_file.c:164)\n[    1.296493]  full_proxy_read (fs/debugfs/file.c:378 (discriminator 1))\n[    1.296658]  vfs_read (fs/read_write.c:572)\n[    1.296981]  ksys_read (fs/read_write.c:717)\n[    1.297132]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\n[    1.297325]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nAdd a NULL check and print \"(none)\" for entries with no assigned slave."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:10:52.103Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/19f0fd87df0e5746b24f5caa465a66a8c6e6e241"
        },
        {
          "url": "https://git.kernel.org/stable/c/edacf1613f7b26423ebfa8b2892e7453c4235354"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ec2c777f357a83c3d503d8d9370c90b60f0ae63"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a3f8cd3f370247ded14d38d216b49dd30eade76"
        },
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          "url": "https://git.kernel.org/stable/c/6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4"
        },
        {
          "url": "https://git.kernel.org/stable/c/017d674cf6930e9586a29ee808c7ca09d1396d07"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c"
        },
        {
          "url": "https://git.kernel.org/stable/c/605b52497bf89b3b154674deb135da98f916e390"
        }
      ],
      "title": "net: bonding: fix NULL deref in bond_debug_rlb_hash_show",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31546",
    "datePublished": "2026-04-24T14:33:14.572Z",
    "dateReserved": "2026-03-09T15:48:24.114Z",
    "dateUpdated": "2026-05-11T22:10:52.103Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31546",
      "date": "2026-07-10",
      "epss": "0.00123",
      "percentile": "0.02413"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31546\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-24T15:16:28.690\",\"lastModified\":\"2026-06-17T10:33:57.073\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: bonding: fix NULL deref in bond_debug_rlb_hash_show\\n\\nrlb_clear_slave intentionally keeps RLB hash-table entries on\\nthe rx_hashtbl_used_head list with slave set to NULL when no\\nreplacement slave is available. However, bond_debug_rlb_hash_show\\nvisites client_info-\u003eslave without checking if it\u0027s NULL.\\n\\nOther used-list iterators in bond_alb.c already handle this NULL-slave\\nstate safely:\\n\\n- rlb_update_client returns early on !client_info-\u003eslave\\n- rlb_req_update_slave_clients, rlb_clear_slave, and rlb_rebalance\\ncompare slave values before visiting\\n- lb_req_update_subnet_clients continues if slave is NULL\\n\\nThe following NULL deref crash can be trigger in\\nbond_debug_rlb_hash_show:\\n\\n[    1.289791] BUG: kernel NULL pointer dereference, address: 0000000000000000\\n[    1.292058] RIP: 0010:bond_debug_rlb_hash_show (drivers/net/bonding/bond_debugfs.c:41)\\n[    1.293101] RSP: 0018:ffffc900004a7d00 EFLAGS: 00010286\\n[    1.293333] RAX: 0000000000000000 RBX: ffff888102b48200 RCX: ffff888102b48204\\n[    1.293631] RDX: ffff888102b48200 RSI: ffffffff839daad5 RDI: ffff888102815078\\n[    1.293924] RBP: ffff888102815078 R08: ffff888102b4820e R09: 0000000000000000\\n[    1.294267] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100f929c0\\n[    1.294564] R13: ffff888100f92a00 R14: 0000000000000001 R15: ffffc900004a7ed8\\n[    1.294864] FS:  0000000001395380(0000) GS:ffff888196e75000(0000) knlGS:0000000000000000\\n[    1.295239] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[    1.295480] CR2: 0000000000000000 CR3: 0000000102adc004 CR4: 0000000000772ef0\\n[    1.295897] Call Trace:\\n[    1.296134]  seq_read_iter (fs/seq_file.c:231)\\n[    1.296341]  seq_read (fs/seq_file.c:164)\\n[    1.296493]  full_proxy_read (fs/debugfs/file.c:378 (discriminator 1))\\n[    1.296658]  vfs_read (fs/read_write.c:572)\\n[    1.296981]  ksys_read (fs/read_write.c:717)\\n[    1.297132]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))\\n[    1.297325]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\\n\\nAdd a NULL check and print \\\"(none)\\\" for entries with no assigned slave.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/bonding/bond_debugfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3\",\"lessThan\":\"19f0fd87df0e5746b24f5caa465a66a8c6e6e241\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3\",\"lessThan\":\"edacf1613f7b26423ebfa8b2892e7453c4235354\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3\",\"lessThan\":\"2ec2c777f357a83c3d503d8d9370c90b60f0ae63\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3\",\"lessThan\":\"0a3f8cd3f370247ded14d38d216b49dd30eade76\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3\",\"lessThan\":\"6a3bb74e25d79cbb15f67ef80f71e2b2bfe27ff4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3\",\"lessThan\":\"017d674cf6930e9586a29ee808c7ca09d1396d07\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3\",\"lessThan\":\"ec9762f0df2f9fbe3f40a3bfa8aab8b2f721466c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"caafa84251b886feb6cdf23d50e2cc99dcdaaaf3\",\"lessThan\":\"605b52497bf89b3b154674deb135da98f916e390\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/bonding/bond_debugfs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.38\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.38\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.253\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.203\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.167\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.130\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.78\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.20\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.10\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.38.1\",\"versionEndExcluding\":\"5.10.253\",\"matchCriteriaId\":\"04177CA2-7B3E-475B-ABB0-BBE8D2851FED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.203\",\"matchCriteriaId\":\"20DDB3E9-AABF-4107-ADB0-5362AA067045\"},{\"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\":\"6.12.78\",\"matchCriteriaId\":\"28D591F5-B196-4CC9-905C-DC80F116E7A8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.20\",\"matchCriteriaId\":\"E5571059-6552-48E7-9BEF-3E358C387171\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel: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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:26:20+00:00",
      "cve": "CVE-2026-31546",
      "id": "CVE-2026-31546",
      "initial_release_date": "2026-04-24T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: bonding: fix NULL deref in bond_debug_rlb_hash_show",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31546.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





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.