{
  "cveId": "CVE-2026-89921",
  "url": "https://patchblox.com/security/cve/CVE-2026-89921",
  "summary": "CVE-2026-89921 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-89921, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: s390: Zero initialize data structures for i...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  KVM: s390: Zero initialize data structures for inject_pfault_token  __kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of the on-stack struct kvm_s390_irq but the full ext substructure is copied into the cpu local variable on inject. ext_params and pad contain stale stack values.  Interrupt delivery only uses ext_params2, so nothing leaks to the guest, but a host user can use the migration ioctls to get to the data.  Fix by zero-initializing the irq struct. Do the same for the inti data structure.",
  "published": "2026-09-16T11:17:01Z",
  "severity": "",
  "epss": 0.00217,
  "epssPercentile": 0.12243,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.113-1",
      "fix": "DEBIAN-CVE-2026-89921",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89921",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89921",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89921",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.113-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-89921",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89921",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}