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        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
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  "vulnerabilities": [
    {
      "cve": "CVE-2024-40953",
      "cwe": {
        "id": "CWE-362",
        "name": "Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')"
      },
      "notes": [
        {
          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\nKVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()\nUse {READ,WRITE}_ONCE() to access kvm->last_boosted_vcpu to ensure the\nloads and stores are atomic.  In the extremely unlikely scenario the\ncompiler tears the stores, it's theoretically possible for KVM to attempt\nto get a vCPU using an out-of-bounds index, e.g. if the write is split\ninto multiple 8-bit stores, and is paired with a 32-bit load on a VM with\n257 vCPUs:\nCPU0                              CPU1\nlast_boosted_vcpu = 0xff;\n(last_boosted_vcpu = 0x100)\nlast_boosted_vcpu[15:8] = 0x01;\ni = (last_boosted_vcpu = 0x1ff)\nlast_boosted_vcpu[7:0] = 0x00;\nvcpu = kvm->vcpu_array[0x1ff];\nAs detected by KCSAN:\nBUG: KCSAN: data-race in kvm_vcpu_on_spin [kvm] / kvm_vcpu_on_spin [kvm]\nwrite to 0xffffc90025a92344 of 4 bytes by task 4340 on cpu 16:\nkvm_vcpu_on_spin (arch/x86/kvm/../../../virt/kvm/kvm_main.c:4112) kvm\nhandle_pause (arch/x86/kvm/vmx/vmx.c:5929) kvm_intel\nvmx_handle_exit (arch/x86/kvm/vmx/vmx.c:?\narch/x86/kvm/vmx/vmx.c:6606) kvm_intel\nvcpu_run (arch/x86/kvm/x86.c:11107 arch/x86/kvm/x86.c:11211) kvm\nkvm_arch_vcpu_ioctl_run (arch/x86/kvm/x86.c:?) kvm\nkvm_vcpu_ioctl (arch/x86/kvm/../../../virt/kvm/kvm_main.c:?) kvm\n__se_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:904 fs/ioctl.c:890)\n__x64_sys_ioctl (fs/ioctl.c:890)\nx64_sys_call (arch/x86/entry/syscall_64.c:33)\ndo_syscall_64 (arch/x86/entry/common.c:?)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\nread to 0xffffc90025a92344 of 4 bytes by task 4342 on cpu 4:\nkvm_vcpu_on_spin (arch/x86/kvm/../../../virt/kvm/kvm_main.c:4069) kvm\nhandle_pause (arch/x86/kvm/vmx/vmx.c:5929) kvm_intel\nvmx_handle_exit (arch/x86/kvm/vmx/vmx.c:?\narch/x86/kvm/vmx/vmx.c:6606) kvm_intel\nvcpu_run (arch/x86/kvm/x86.c:11107 arch/x86/kvm/x86.c:11211) kvm\nkvm_arch_vcpu_ioctl_run (arch/x86/kvm/x86.c:?) kvm\nkvm_vcpu_ioctl (arch/x86/kvm/../../../virt/kvm/kvm_main.c:?) kvm\n__se_sys_ioctl (fs/ioctl.c:52 fs/ioctl.c:904 fs/ioctl.c:890)\n__x64_sys_ioctl (fs/ioctl.c:890)\nx64_sys_call (arch/x86/entry/syscall_64.c:33)\ndo_syscall_64 (arch/x86/entry/common.c:?)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\nvalue changed: 0x00000012 -> 0x00000000",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2024-40953"
        }
      ],
      "release_date": "2024-07-12T00:00:00",
      "scores": [
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            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 4.7,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
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