{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "be66e67f175096f283c9d5614c4991fc9e7ed975"
            },
            {
              "fixed": "2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8"
            },
            {
              "fixed": "9fa301d8298778dd799fa4dcf7a7f440715d146e"
            },
            {
              "fixed": "c646431865f4b1a5b14067233fa27b11e05e0d46"
            },
            {
              "fixed": "7fca3fcef81c713bc82a37bf741e0f28e6d04a6f"
            },
            {
              "fixed": "8cc8bbbfab14c22c5551d0dd19b208a44b141c76"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64287.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU\n\nflush_hyp_vcpu() copies the host vGIC state into the hyp's private vCPU\non every run. The vGIC list register save and restore use used_lrs as\ntheir loop bound and expect it to stay within the number of implemented\nlist registers. While this is generally the case, flush_hyp_vcpu()\ncopies vgic_v3 verbatim and does not enforce this, so a value provided\nby the host is used at EL2 to index vgic_lr[] and access ICH_LR\u003cn\u003e_EL2\n(host -\u003e EL2).\n\nFix by clamping used_lrs to the number of implemented list registers\nafter the copy, as the trusted path already does in\nvgic_flush_lr_state(). The number of implemented list registers is\nconstant after init, so it is replicated once from\nkvm_vgic_global_state.nr_lr into hyp_gicv3_nr_lr rather than read on\nevery entry.",
  "id": "CVE-2026-64287",
  "modified": "2026-08-18T03:31:27.772129888Z",
  "published": "2026-07-25T08:49:28.168Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c5e72b9fbf83fdfa724e9f1af0f418ccf8739b8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7fca3fcef81c713bc82a37bf741e0f28e6d04a6f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cc8bbbfab14c22c5551d0dd19b208a44b141c76"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9fa301d8298778dd799fa4dcf7a7f440715d146e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c646431865f4b1a5b14067233fa27b11e05e0d46"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64287.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64287"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU"
}