KVM: x86/hyper-v: Skip non-canonical addresses during PV TLB flush

{
  "id": "2bb02be64d690ea6883607051ed8882d1df75a49ff4d8986cc99f40848ccccc0",
  "url": "https://osv.dev/vulnerability/CVE-2025-38351",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "KVM: x86/hyper-v: Skip non-canonical addresses during PV TLB flush",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: KVM: x86/hyper-v: Skip non-canonical addresses during PV TLB flush In KVM guests with Hyper-V hypercalls enabled, the hypercalls HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST and HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX allow a guest to request invalidation of portions of a virtual TLB. For this, the hypercall parameter includes a list of GVAs that are supposed to be invalidated. However, when non-canonical GVAs are passed, there is currently no filtering in place and they are eventually passed to checked invocations of INVVPID on Intel / INVLPGA on AMD. While AMD's INVLPGA silently ignores non-canonical addresses (effectively a no-op), Intel's INVVPID explicitly signals VM-Fail and ultimately triggers the WARN_ONCE in invvpid_error(): invvpid failed: ext=0x0 vpid=1 gva=0xaaaaaaaaaaaaa000 WARNING: CPU: 6 PID: 326 at arch/x86/kvm/vmx/vmx.c:482 invvpid_error+0x91/0xa0 [kvm_intel] Modules linked in: kvm_intel kvm 9pnet_virtio irqbypass fuse CPU: 6 UID: 0 PID: 326 Comm: kvm-vm Not tainted 6.15.0 #14 PREEMPT(voluntary) RIP: 0010:invvpid_error+0x91/0xa0 [kvm_intel] Call Trace: vmx_flush_tlb_gva+0x320/0x490 [kvm_intel] kvm_hv_vcpu_flush_tlb+0x24f/0x4f0 [kvm] kvm_arch_vcpu_ioctl_run+0x3013/0x5810 [kvm] Hyper-V documents that invalid GVAs (those that are beyond a partition's GVA space) are to be ignored. While not completely clear whether this ruling also applies to non-canonical GVAs, it is likely fine to make that assumption, and m",
    "evidence": "osv:CVE-2025-38351",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.103",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.41",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38351",
      "aliases": [
        "CVE-2025-38351"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "260970862c88b4130e9e12be023c7e2c2d37a966"
                },
                {
                  "fixed": "d5784ea45663330eaa868c518ea40e7a9f06aa2d"
                },
                {
                  "fixed": "f1b3ad11ec11c88ba9f79a73d27d4cda3f80fb24"
                },
                {
                  "fixed": "2d4dea3f76510c0afe3f18c910f647b816f7d566"
                },
                {
                  "fixed": "fa787ac07b3ceb56dd88a62d1866038498e96230"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38351.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.103"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.41"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.15.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38351.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.845408580Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2d4dea3f76510c0afe3f18c910f647b816f7d566",
        "https://git.kernel.org/stable/c/d5784ea45663330eaa868c518ea40e7a9f06aa2d",
        "https://git.kernel.org/stable/c/f1b3ad11ec11c88ba9f79a73d27d4cda3f80fb24",
        "https://git.kernel.org/stable/c/fa787ac07b3ceb56dd88a62d1866038498e96230",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38351.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38351",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38351.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38351",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499828,
  "published_at": "2025-07-19T11:59:34.078+00:00"
}