{
  "fix": "RHSA-2021:3088",
  "url": "https://patchblox.com/security/fix/linux/rhsa-2021-3088",
  "summary": "RHSA-2021:3088, released August 10, 2021, fixes 3 CVEs across 12 products. One of them is being exploited (CVE-2021-22555); 1 on CISA KEV. Patch Radar priority: Patch now.",
  "platform": "linux",
  "type": "advisory",
  "title": "Security update for 12 packages",
  "released": "2021-08-10T00:00:00Z",
  "priority": "Patch now",
  "priorityTier": 1,
  "priorityReason": "Closes CVE-2021-22555, exploited (CISA KEV)",
  "supported": true,
  "cveCount": 3,
  "exploitedCveCount": 1,
  "kevCveCount": 1,
  "ransomwareCveCount": 0,
  "maxEpss": 0.78684,
  "maxCvss": 7.8,
  "vendorAdvisory": "https://access.redhat.com/errata/RHSA-2021:3088",
  "appliesTo": [
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      "supported": true
    },
    {
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      "release": "RHEL 8",
      "fixedVersion": "0:4.18.0-305.12.1.rt7.84.el8_4",
      "supported": true
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    {
      "product": "kernel-rt-debug-devel",
      "productUrl": "https://patchblox.com/security/product/linux/kernel-rt-debug-devel",
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      "supported": true
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    {
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      "productUrl": "https://patchblox.com/security/product/linux/kernel-rt-debug-kvm",
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      "fixedVersion": "0:4.18.0-305.12.1.rt7.84.el8_4",
      "supported": true
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    {
      "product": "kernel-rt-debug-modules",
      "productUrl": "https://patchblox.com/security/product/linux/kernel-rt-debug-modules",
      "release": "RHEL 8",
      "fixedVersion": "0:4.18.0-305.12.1.rt7.84.el8_4",
      "supported": true
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    {
      "product": "kernel-rt-debug-modules-extra",
      "productUrl": "https://patchblox.com/security/product/linux/kernel-rt-debug-modules-extra",
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      "fixedVersion": "0:4.18.0-305.12.1.rt7.84.el8_4",
      "supported": true
    },
    {
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      "fixedVersion": "0:4.18.0-305.12.1.rt7.84.el8_4",
      "supported": true
    },
    {
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      "productUrl": "https://patchblox.com/security/product/linux/kernel-rt-kvm",
      "release": "RHEL 8",
      "fixedVersion": "0:4.18.0-305.12.1.rt7.84.el8_4",
      "supported": true
    },
    {
      "product": "kernel-rt-modules",
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      "supported": true
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    {
      "product": "kernel-rt-modules-extra",
      "productUrl": "https://patchblox.com/security/product/linux/kernel-rt-modules-extra",
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      "supported": true
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  ],
  "cves": [
    {
      "cveId": "CVE-2021-22555",
      "url": "https://patchblox.com/security/cve/CVE-2021-22555",
      "title": "bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: r...",
      "priority": "Patch now",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.78684,
      "kev": true,
      "ransomware": false,
      "exploited": true,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-22543",
      "url": "https://patchblox.com/security/cve/CVE-2021-22543",
      "title": "kpatch-patch-4_18_0-305_3_1: This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of...",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.8,
      "epss": 0.0066,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2021-3609",
      "url": "https://patchblox.com/security/cve/CVE-2021-3609",
      "title": "bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: r...",
      "priority": "High",
      "severity": "Important",
      "cvss": 7,
      "epss": 0.00431,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T18:46:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}