{
  "cveId": "CVE-2026-98638",
  "url": "https://patchblox.com/security/cve/CVE-2026-98638",
  "summary": "CVE-2026-98638 is fixed in 20 products on 1 platform, first by DEBIAN-CVE-2026-98638, released October 19, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()  pkvm_vcpu_init_sve() clamps only the upper bound of the host-provided sve_max_vl, so an invalid vector length reaches sve_state_size_from_vl() and the WARN_ON() there, which is fatal at EL2. The existing !sve_state_size test rejects such a length, but only after the macro has run.  Check sve_vl_valid() before deriving the state size. A valid length cannot yield a zero size, so the !sve_state_size test goes with it.",
  "published": "2026-10-18T16:17:16Z",
  "severity": "important",
  "epss": 0.00166,
  "epssPercentile": 0.05892,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98638",
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel-livepatch-6.18.56-125.164",
      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-debuginfo-common-x86_64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-headers",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-modules-extra-common",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "kernel6.18-tools-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.9-1",
      "fix": "DEBIAN-CVE-2026-98638",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98638",
      "released": "2026-10-19T16:27:52Z"
    },
    {
      "platform": "linux",
      "product": "microvm-kernel6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.56-125.164.amzn2023",
      "fix": "ALAS2023-2026-3251",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3251",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}