{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e309fd113b9f6c34672a487be08fecb7e12e7e29"
            },
            {
              "fixed": "82088f88c96b99c27a974d09b02c2b133262fadf"
            },
            {
              "fixed": "735bc20c24187ca419c9d5e63860a54b91be34bd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.18.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89513.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Fix PMU event info array size overflow\n\nSBI PMU EVENT_GET_INFO stores guest-controlled num_events * sizeof(*einfo)\nin a 32-bit integer. On RV64, num_events = 0x10000001 makes 0x100000010\ntruncate to 16. KVM then allocates one entry but loops over the original\nnum_events, causing out-of-bounds reads and writes. A nested guest\ntriggered:\n\nBUG: KASAN: slab-out-of-bounds in kvm_riscv_vcpu_pmu_event_info+0xa4/0x142\nRead of size 4 at addr ff600000074d46b0 by task init/1\nCall Trace:\n[\u003cffffffff8006471c\u003e] kvm_riscv_vcpu_pmu_event_info+0xa4/0x142\n[\u003cffffffff800690c0\u003e] kvm_sbi_ext_pmu_handler+0xca/0x268\n[\u003cffffffff8006779e\u003e] kvm_riscv_vcpu_sbi_ecall+0xec/0x1e6\n[\u003cffffffff8006008c\u003e] kvm_riscv_vcpu_exit+0x48c/0x540\n[\u003cffffffff8005ea0a\u003e] kvm_arch_vcpu_ioctl_run+0x37e/0xc80\nAllocated by task 1:\n __kmalloc_noprof+0x19e/0x4b0\n kvm_riscv_vcpu_pmu_event_info+0x72/0x142\n kvm_sbi_ext_pmu_handler+0xca/0x268\n kvm_riscv_vcpu_sbi_ecall+0xec/0x1e6\n kvm_riscv_vcpu_exit+0x48c/0x540\n kvm_arch_vcpu_ioctl_run+0x37e/0xc80\nThe buggy address is located 0 bytes to the right of\n allocated 16-byte region [ff600000074d46a0, ff600000074d46b0)\n\nStore the shared-memory size in size_t and reject multiplication overflow.\nAllocate the guest-driven array with GFP_KERNEL_ACCOUNT so it is charged\nto kmemcg, and use __GFP_NOWARN to suppress allocation failure warnings.\nUse kvcalloc() to allow vmalloc fallback and an unsigned long loop index\nto match num_events.",
  "id": "CVE-2026-89513",
  "modified": "2026-09-15T03:30:56.716196621Z",
  "published": "2026-09-11T19:43:57.960Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/735bc20c24187ca419c9d5e63860a54b91be34bd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82088f88c96b99c27a974d09b02c2b133262fadf"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89513.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89513"
    },
    {
      "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:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "RISC-V: KVM: Fix PMU event info array size overflow"
}