{
  "cveId": "CVE-2026-23425",
  "url": "https://patchblox.com/security/cve/CVE-2026-23425",
  "summary": "CVE-2026-23425 is fixed in 36 products on 1 platform, first by DEBIAN-CVE-2026-23425, released April 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  KVM: arm64: Fix ID register initialization for n...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  KVM: arm64: Fix ID register initialization for non-protected pKVM guests  In protected mode, the hypervisor maintains a separate instance of the \u0060kvm\u0060 structure for each VM. For non-protected VMs, this structure is initialized from the host\u0027s \u0060kvm\u0060 state.  Currently, \u0060pkvm_init_features_from_host()\u0060 copies the \u0060KVM_ARCH_FLAG_ID_REGS_INITIALIZED\u0060 flag from the host without the underlying \u0060id_regs\u0060 data being initialized. This results in the hypervisor seeing the flag as set while the ID registers remain zeroed.  Consequently, \u0060kvm_has_feat()\u0060 checks at EL2 fail (return 0) for non-protected VMs. This breaks logic that relies on feature detection, such as \u0060ctxt_has_tcrx()\u0060 for TCR2_EL1 support. As a result, certain system registers (e.g., TCR2_EL1, PIR_EL1, POR_EL1) are not saved/restored during the world switch, which could lead to state corruption.  Fix this by explicitly copying the ID registers from the host \u0060kvm\u0060 to the hypervisor \u0060kvm\u0060 for non-protected VMs during initialization, since we trust the host with its non-protected guests\u0027 features. Also ensure \u0060KVM_ARCH_FLAG_ID_REGS_INITIALIZED\u0060 is cleared initially in \u0060pkvm_init_features_from_host\u0060 so that \u0060vm_copy_id_regs\u0060 can properly initialize them and set the flag once done.",
  "published": "2026-04-03T14:16:28Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00124,
  "epssPercentile": 0.0212,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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      "fix": "ALAS2023-2026-1596",
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      "released": "2026-04-27T09:00:00Z"
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      "released": "2026-04-27T09:00:00Z"
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      "fix": "OPENSUSE-SU-2026:20572-1",
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      "released": "2026-04-20T17:16:35Z"
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  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}