CVE-2026-98465 (GCVE-0-2026-98465)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:15 – Updated: 2026-10-24 14:08
VLAI
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.
Severity
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: db8b7e97d6137a28b2bfc07e591d54da268f0c36 , < 6c2bcf6b173d4afed883cceea9d47f2c5194161d (git)
Affected: db8b7e97d6137a28b2bfc07e591d54da268f0c36 , < a29c5d2dd2ef9a8617a9a6d5585696d5f149cd98 (git)
Affected: db8b7e97d6137a28b2bfc07e591d54da268f0c36 , < c525772c304c971b0d3a1f2898dedbae653efe90 (git)
Affected: db8b7e97d6137a28b2bfc07e591d54da268f0c36 , < 71acbea44e78665ea90e3c310fca6bbdcc0252db (git)
Affected: db8b7e97d6137a28b2bfc07e591d54da268f0c36 , < 8ae12ccaec6ec74945d8c1ef39f2c1b8df779abc (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.5
Unaffected: 0 , < 6.5 (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Serialize IMSIC attributes with vCPU migration\n\nKVM device ioctls are not serialized against KVM_RUN. As a result,\nkvm_riscv_aia_imsic_rw_attr() can snapshot the physical CPU and HGEI of\nan IMSIC VS-file before a concurrent vCPU migration releases it.\n\nThe HGEI can then be allocated to another vCPU before imsic_vsfile_rw()\nuses the stale tuple. A GET or SET attribute may consequently access the\nnew owner\u0027s interrupt file.\n\nSerialize the entire IMSIC attribute operation with the target vCPU\nmutex. This prevents the VS-file from being migrated and recycled until\nthe attribute access completes. Acquire the mutex killably so that the\ndevice ioctl remains interruptible while waiting for KVM_RUN to finish."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H",
            "version": "3.1"
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              "value": "AV:L - A local process reaches the patched kvm_riscv_aia_imsic_rw_attr() through kvm_device_ioctl() and aia_get_attr()/aia_set_attr() using KVM_GET_DEVICE_ATTR or KVM_SET_DEVICE_ATTR; no network or guest-protocol input reaches it.\nAC:H - The attacker can race its attribute ioctl against KVM_RUN, but cross-owner impact also requires kvm_riscv_aia_alloc_hgei() to reassign the freed per-CPU HGEI to a victim vCPU before imsic_vsfile_rw() runs, which the attacker cannot ensure.\nPR:L - No capable() check guards this path, but the caller must have opened /dev/kvm and created and retained the VM, vCPU, and RISC-V AIA device fds; ordinary authorized KVM-user access suffices without init-namespace administration.\nUI:N - The attacking process itself issues the concurrent KVM_RUN and KVM_GET_DEVICE_ATTR or KVM_SET_DEVICE_ATTR operations; no victim user must mount, open, or approve anything.\nS:C - kvm_riscv_aia_alloc_hgei() uses the global per-CPU aia_hgei owners array rather than a per-VM pool, so the recycled interrupt file can belong to a vCPU in a different VM security boundary.\nC:L - A stale GET makes imsic_vsfile_local_rw() disclose one selected EIDELIVERY, EITHRESHOLD, EIP*, or EIE* word from the new owner\u0027s interrupt file, exposing bounded interrupt state rather than arbitrary guest or host memory.\nI:L - A stale SET makes imsic_vsfile_local_rw() write attacker-chosen values to the new owner\u0027s delivery, threshold, pending, or enable register, but it provides no arbitrary memory write or demonstrated control-flow primitive.\nA:H - imsic_vsfile_local_rw() can write EIDELIVERY=0 or clear EIE* in the new owner\u0027s file; for a single-vCPU victim this suppresses all external-interrupt delivery and can leave guest I/O persistently hung."
            }
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        "shortName": "Linux"
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    "cveId": "CVE-2026-98465",
    "datePublished": "2026-10-18T15:15:17.498Z",
    "dateReserved": "2026-09-25T10:25:14.350Z",
    "dateUpdated": "2026-10-24T14:08:57.467Z",
    "state": "PUBLISHED"
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      "initial_release_date": "2026-10-20T01:02:31.000Z",
      "product_status:known_not_affected": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "RISC-V: KVM: Serialize IMSIC attributes with vCPU migration",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98465.json",
      "version": "3"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Serialize IMSIC attributes with vCPU migration\n\nKVM device ioctls are not serialized against KVM_RUN. As a result,\nkvm_riscv_aia_imsic_rw_attr() can snapshot the physical CPU and HGEI of\nan IMSIC VS-file before a concurrent vCPU migration releases it.\n\nThe HGEI can then be allocated to another vCPU before imsic_vsfile_rw()\nuses the stale tuple. A GET or SET attribute may consequently access the\nnew owner\u0027s interrupt file.\n\nSerialize the entire IMSIC attribute operation with the target vCPU\nmutex. This prevents the VS-file from being migrated and recycled until\nthe attribute access completes. Acquire the mutex killably so that the\ndevice ioctl remains interruptible while waiting for KVM_RUN to finish."
          }
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        "id": "CVE-2026-98465",
        "lastModified": "2026-10-24T14:16:43.033",
        "metrics": {
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                "confidentialityImpact": "LOW",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RISC-V: KVM: Serialize IMSIC attributes with vCPU migration",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98465.json",
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    }
  }
}



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