RISC-V: KVM: Serialize IMSIC attributes with vCPU migration

{
  "id": "9c3874d14bb90d95b7d76ed29514a5aa17407defad7ce38b3bc3adbcf7b5494e",
  "url": "https://osv.dev/vulnerability/CVE-2026-98465",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RISC-V: KVM: Serialize IMSIC attributes with vCPU migration",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Serialize IMSIC attributes with vCPU migration KVM device ioctls are not serialized against KVM_RUN. As a result, kvm_riscv_aia_imsic_rw_attr() can snapshot the physical CPU and HGEI of an IMSIC VS-file before a concurrent vCPU migration releases it. The HGEI can then be allocated to another vCPU before imsic_vsfile_rw() uses the stale tuple. A GET or SET attribute may consequently access the new owner's interrupt file. Serialize the entire IMSIC attribute operation with the target vCPU mutex. This prevents the VS-file from being migrated and recycled until the attribute access completes. Acquire the mutex killably so that the device ioctl remains interruptible while waiting for KVM_RUN to finish.",
    "evidence": "osv:CVE-2026-98465",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.160",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.55",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-98465",
      "aliases": [
        "CVE-2026-98465"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "db8b7e97d6137a28b2bfc07e591d54da268f0c36"
                },
                {
                  "fixed": "6c2bcf6b173d4afed883cceea9d47f2c5194161d"
                },
                {
                  "fixed": "a29c5d2dd2ef9a8617a9a6d5585696d5f149cd98"
                },
                {
                  "fixed": "c525772c304c971b0d3a1f2898dedbae653efe90"
                },
                {
                  "fixed": "71acbea44e78665ea90e3c310fca6bbdcc0252db"
                },
                {
                  "fixed": "8ae12ccaec6ec74945d8c1ef39f2c1b8df779abc"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98465.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.5.0"
                },
                {
                  "fixed": "6.6.160"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.55"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98465.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.629561024Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/6c2bcf6b173d4afed883cceea9d47f2c5194161d",
        "https://git.kernel.org/stable/c/71acbea44e78665ea90e3c310fca6bbdcc0252db",
        "https://git.kernel.org/stable/c/8ae12ccaec6ec74945d8c1ef39f2c1b8df779abc",
        "https://git.kernel.org/stable/c/a29c5d2dd2ef9a8617a9a6d5585696d5f149cd98",
        "https://git.kernel.org/stable/c/c525772c304c971b0d3a1f2898dedbae653efe90",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98465.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98465",
        "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/2026/98xxx/CVE-2026-98465.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98465",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 506267,
  "published_at": "2026-10-18T15:15:17.498+00:00"
}