{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"
            },
            {
              "fixed": "7d3c27b54253cda91dc4d2c1bfc109c490837ab9"
            },
            {
              "fixed": "6d69c0ed978f7f0efd053fc98390f25ab77c1aea"
            },
            {
              "fixed": "73b9c1e5da84cd69b1a86e374e450817cd051371"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.18.30"
            },
            {
              "fixed": "7.0.7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.18.30"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46147.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()\n\nTwo bugs exist in the vCPU initialisation path:\n\n1. If a check fails after hyp_pin_shared_mem() succeeds, the cleanup\n   path jumps to 'unlock' without calling unpin_host_vcpu() or\n   unpin_host_sve_state(), permanently leaking pin references on the\n   host vCPU and SVE state pages.\n\n   Extract a register_hyp_vcpu() helper that performs the checks and\n   the store. When register_hyp_vcpu() returns an error, call\n   unpin_host_vcpu() and unpin_host_sve_state() inline before falling\n   through to the existing 'unlock' label.\n\n2. register_hyp_vcpu() publishes the new vCPU pointer into\n   'hyp_vm-\u003evcpus[]' with a bare store, allowing a concurrent caller\n   of pkvm_load_hyp_vcpu() to observe a partially initialised vCPU\n   object.\n\n   Ensure the store uses smp_store_release() and the load uses\n   smp_load_acquire(). While 'vm_table_lock' currently serialises the\n   store and the load, these barriers ensure the reader sees the fully\n   initialised 'hyp_vcpu' object even if there were a lockless path or\n   if the lock's own ordering guarantees were insufficient for nested\n   object initialization.",
  "id": "CVE-2026-46147",
  "modified": "2026-07-08T05:38:27.724365573Z",
  "published": "2026-05-28T09:36:03.892Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d69c0ed978f7f0efd053fc98390f25ab77c1aea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/73b9c1e5da84cd69b1a86e374e450817cd051371"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d3c27b54253cda91dc4d2c1bfc109c490837ab9"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46147.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46147"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "summary": "KVM: arm64: Fix pin leak and publication ordering in __pkvm_init_vcpu()"
}