nvd-json-data-feeds/CVE-2024/CVE-2024-410xx/CVE-2024-41070.json

{
  "id": "CVE-2024-41070",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2024-07-29T15:15:14.787",
  "lastModified": "2024-11-21T09:32:11.070",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: PPC: Book3S HV: Prevent UAF in kvm_spapr_tce_attach_iommu_group()\n\nAl reported a possible use-after-free (UAF) in kvm_spapr_tce_attach_iommu_group().\n\nIt looks up `stt` from tablefd, but then continues to use it after doing\nfdput() on the returned fd. After the fdput() the tablefd is free to be\nclosed by another thread. The close calls kvm_spapr_tce_release() and\nthen release_spapr_tce_table() (via call_rcu()) which frees `stt`.\n\nAlthough there are calls to rcu_read_lock() in\nkvm_spapr_tce_attach_iommu_group() they are not sufficient to prevent\nthe UAF, because `stt` is used outside the locked regions.\n\nWith an artifcial delay after the fdput() and a userspace program which\ntriggers the race, KASAN detects the UAF:\n\n  BUG: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\n  Read of size 4 at addr c000200027552c30 by task kvm-vfio/2505\n  CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1\n  Hardware name: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35-g1851b2a06 PowerNV\n  Call Trace:\n    dump_stack_lvl+0xb4/0x108 (unreliable)\n    print_report+0x2b4/0x6ec\n    kasan_report+0x118/0x2b0\n    __asan_load4+0xb8/0xd0\n    kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm]\n    kvm_vfio_set_attr+0x524/0xac0 [kvm]\n    kvm_device_ioctl+0x144/0x240 [kvm]\n    sys_ioctl+0x62c/0x1810\n    system_call_exception+0x190/0x440\n    system_call_vectored_common+0x15c/0x2ec\n  ...\n  Freed by task 0:\n   ...\n   kfree+0xec/0x3e0\n   release_spapr_tce_table+0xd4/0x11c [kvm]\n   rcu_core+0x568/0x16a0\n   handle_softirqs+0x23c/0x920\n   do_softirq_own_stack+0x6c/0x90\n   do_softirq_own_stack+0x58/0x90\n   __irq_exit_rcu+0x218/0x2d0\n   irq_exit+0x30/0x80\n   arch_local_irq_restore+0x128/0x230\n   arch_local_irq_enable+0x1c/0x30\n   cpuidle_enter_state+0x134/0x5cc\n   cpuidle_enter+0x6c/0xb0\n   call_cpuidle+0x7c/0x100\n   do_idle+0x394/0x410\n   cpu_startup_entry+0x60/0x70\n   start_secondary+0x3fc/0x410\n   start_secondary_prolog+0x10/0x14\n\nFix it by delaying the fdput() until `stt` is no longer in use, which\nis effectively the entire function. To keep the patch minimal add a call\nto fdput() at each of the existing return paths. Future work can convert\nthe function to goto or __cleanup style cleanup.\n\nWith the fix in place the test case no longer triggers the UAF."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: PPC: Book3S HV: Prevenir UAF en kvm_spapr_tce_attach_iommu_group() Al inform\u00f3 un posible use after free (UAF) en kvm_spapr_tce_attach_iommu_group(). Busca `stt` en tablefd, pero luego contin\u00faa us\u00e1ndolo despu\u00e9s de realizar fdput() en el fd devuelto. Despu\u00e9s de fdput(), otro hilo puede cerrar el tablefd. El cierre llama a kvm_spapr_tce_release() y luego a release_spapr_tce_table() (a trav\u00e9s de call_rcu()) que libera `stt`. Aunque hay llamadas a rcu_read_lock() en kvm_spapr_tce_attach_iommu_group(), no son suficientes para evitar la UAF, porque `stt` se usa fuera de las regiones bloqueadas. Con un retraso artificial despu\u00e9s de fdput() y un programa de espacio de usuario que desencadena la ejecuci\u00f3n, KASAN detecta la UAF: ERROR: KASAN: slab-use-after-free in kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm] Lectura de tama\u00f1o 4 en direcci\u00f3n c000200027552c30 por tarea kvm-vfio/2505 CPU: 54 PID: 2505 Comm: kvm-vfio Not tainted 6.10.0-rc3-next-20240612-dirty #1 Nombre de hardware: 8335-GTH POWER9 0x4e1202 opal:skiboot-v6.5.3-35 -g1851b2a06 Seguimiento de llamadas de PowerNV: dump_stack_lvl+0xb4/0x108 (no confiable) print_report+0x2b4/0x6ec kasan_report+0x118/0x2b0 __asan_load4+0xb8/0xd0 kvm_spapr_tce_attach_iommu_group+0x298/0x720 [kvm] kvm_vfio_set_attr+0x524/0xac0 [kvm] kvm_device_ioctl+0x144/0x240 [kvm] sys_ioctl+0x62c/0x1810 system_call_exception+0x190/0x440 system_call_vectored_common+0x15c/0x2ec ... Liberado por la tarea 0: ... kfree+0xec/0x3e0 release_spapr_tce_table+0xd4/0x11c [rcu_core+0x568/0 x16a0 handle_softirqs+0x23c /0x920 do_softirq_own_stack+0x6c/0x90 do_softirq_own_stack+0x58/0x90 __irq_exit_rcu+0x218/0x2d0 irq_exit+0x30/0x80 arch_local_irq_restore+0x128/0x230 arch_local_irq_enable+0x1c/0x 30 cpuidle_enter_state+0x134/0x5cc cpuidle_enter+0x6c/0xb0 call_cpuidle+0x7c/0x100 do_idle+0x394 /0x410 cpu_startup_entry+0x60/0x70 start_secondary+0x3fc/0x410 start_secondary_prolog+0x10/0x14 Solucionarlo retrasando fdput() hasta que `stt` ya no est\u00e9 en uso, que es efectivamente toda la funci\u00f3n. Para mantener el parche m\u00ednimo, agregue una llamada a fdput() en cada una de las rutas de retorno existentes. El trabajo futuro puede convertir la funci\u00f3n a limpieza de estilo goto o __cleanup. Con la soluci\u00f3n implementada, el caso de prueba ya no activa la UAF."
    }
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        "type": "Primary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
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      "description": [
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          "lang": "en",
          "value": "CWE-416"
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