{
  "cveId": "CVE-2026-46147",
  "url": "https://patchblox.com/security/cve/CVE-2026-46147",
  "summary": "CVE-2026-46147 is fixed in 34 products on 1 platform, first by ALAS2023-2026-1754, released May 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "KVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  KVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()  Two bugs exist in the vCPU initialisation path:  1. If a check fails after hyp_pin_shared_mem() succeeds, the cleanup    path jumps to \u0027unlock\u0027 without calling unpin_host_vcpu() or    unpin_host_sve_state(), permanently leaking pin references on the    host vCPU and SVE state pages.     Extract a register_hyp_vcpu() helper that performs the checks and    the store. When register_hyp_vcpu() returns an error, call    unpin_host_vcpu() and unpin_host_sve_state() inline before falling    through to the existing \u0027unlock\u0027 label.  2. register_hyp_vcpu() publishes the new vCPU pointer into    \u0027hyp_vm-\u003Evcpus[]\u0027 with a bare store, allowing a concurrent caller    of pkvm_load_hyp_vcpu() to observe a partially initialised vCPU    object.     Ensure the store uses smp_store_release() and the load uses    smp_load_acquire(). While \u0027vm_table_lock\u0027 currently serialises the    store and the load, these barriers ensure the reader sees the fully    initialised \u0027hyp_vcpu\u0027 object even if there were a lockless path or    if the lock\u0027s own ordering guarantees were insufficient for nested    object initialization.",
  "published": "2026-05-25T09:00:00Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "cwe": "Missing Release of Memory after Effective Lifetime",
  "epss": 0.00126,
  "epssPercentile": 0.02322,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46147",
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      "released": "2026-05-25T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}