{
  "cveId": "CVE-2024-47717",
  "url": "https://patchblox.com/security/cve/CVE-2024-47717",
  "summary": "CVE-2024-47717 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-47717, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  RISC-V: KVM: Don\u0027t zero-out PMU snapshot area be...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  RISC-V: KVM: Don\u0027t zero-out PMU snapshot area before freeing data  With the latest Linux-6.11-rc3, the below NULL pointer crash is observed when SBI PMU snapshot is enabled for the guest and the guest is forcefully powered-off.    Unable to handle kernel NULL pointer dereference at virtual address 0000000000000508   Oops [#1]   Modules linked in: kvm   CPU: 0 UID: 0 PID: 61 Comm: term-poll Not tainted 6.11.0-rc3-00018-g44d7178dd77a #3   Hardware name: riscv-virtio,qemu (DT)   epc : __kvm_write_guest_page\u002B0x94/0xa6 [kvm]    ra : __kvm_write_guest_page\u002B0x54/0xa6 [kvm]   epc : ffffffff01590e98 ra : ffffffff01590e58 sp : ffff8f80001f39b0    gp : ffffffff81512a60 tp : ffffaf80024872c0 t0 : ffffaf800247e000    t1 : 00000000000007e0 t2 : 0000000000000000 s0 : ffff8f80001f39f0    s1 : 00007fff89ac4000 a0 : ffffffff015dd7e8 a1 : 0000000000000086    a2 : 0000000000000000 a3 : ffffaf8000000000 a4 : ffffaf80024882c0    a5 : 0000000000000000 a6 : ffffaf800328d780 a7 : 00000000000001cc    s2 : ffffaf800197bd00 s3 : 00000000000828c4 s4 : ffffaf800248c000    s5 : ffffaf800247d000 s6 : 0000000000001000 s7 : 0000000000001000    s8 : 0000000000000000 s9 : 00007fff861fd500 s10: 0000000000000001    s11: 0000000000800000 t3 : 00000000000004d3 t4 : 00000000000004d3    t5 : ffffffff814126e0 t6 : ffffffff81412700   status: 0000000200000120 badaddr: 0000000000000508 cause: 000000000000000d   [\u003Cffffffff01590e98\u003E] __kvm_write_guest_page\u002B0x94/0xa6 [kvm]   [\u003Cffffffff015943a6\u003E] kvm_vcpu_write_guest\u002B0x56/0x90 [kvm]   [\u003Cffffffff015a175c\u003E] kvm_pmu_clear_snapshot_area\u002B0x42/0x7e [kvm]   [\u003Cffffffff015a1972\u003E] kvm_riscv_vcpu_pmu_deinit.part.0\u002B0xe0/0x14e [kvm]   [\u003Cffffffff015a2ad0\u003E] kvm_riscv_vcpu_pmu_deinit\u002B0x1a/0x24 [kvm]   [\u003Cffffffff0159b344\u003E] kvm_arch_vcpu_destroy\u002B0x28/0x4c [kvm]   [\u003Cffffffff0158e420\u003E] kvm_destroy_vcpus\u002B0x5a/0xda [kvm]   [\u003Cffffffff0159930c\u003E] kvm_arch_destroy_vm\u002B0x14/0x28 [kvm]   [\u003Cffffffff01593260\u003E] kvm_destroy_vm\u002B0x168/0x2a0 [kvm]   [\u003Cffffffff015933d4\u003E] kvm_put_kvm\u002B0x3c/0x58 [kvm]   [\u003Cffffffff01593412\u003E] kvm_vm_release\u002B0x22/0x2e [kvm]  Clearly, the kvm_vcpu_write_guest() function is crashing because it is being called from kvm_pmu_clear_snapshot_area() upon guest tear down.  To address the above issue, simplify the kvm_pmu_clear_snapshot_area() to not zero-out PMU snapshot area from kvm_pmu_clear_snapshot_area() because the guest is anyway being tore down.  The kvm_pmu_clear_snapshot_area() is also called when guest changes PMU snapshot area of a VCPU but even in this case the previous PMU snaphsot area must not be zeroed-out because the guest might have reclaimed the pervious PMU snapshot area for some other purpose.",
  "published": "2024-10-21T12:15:08Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00216,
  "epssPercentile": 0.12056,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.11.2-1",
      "fix": "DEBIAN-CVE-2024-47717",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-47717",
      "released": "2024-10-21T12:15:08Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.11.2-1",
      "fix": "DEBIAN-CVE-2024-47717",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2024-47717",
      "released": "2024-10-21T12:15:08Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}