{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2024-26785"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix protection fault in iommufd_test_syz_conv_iova\n\nSyzkaller reported the following bug:\n\n  general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN\n  KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]\n  Call Trace:\n   lock_acquire\n   lock_acquire+0x1ce/0x4f0\n   down_read+0x93/0x4a0\n   iommufd_test_syz_conv_iova+0x56/0x1f0\n   iommufd_test_access_rw.isra.0+0x2ec/0x390\n   iommufd_test+0x1058/0x1e30\n   iommufd_fops_ioctl+0x381/0x510\n   vfs_ioctl\n   __do_sys_ioctl\n   __se_sys_ioctl\n   __x64_sys_ioctl+0x170/0x1e0\n   do_syscall_x64\n   do_syscall_64+0x71/0x140\n\nThis is because the new iommufd_access_change_ioas() sets access-\u003eioas to\nNULL during its process, so the lock might be gone in a concurrent racing\ncontext.\n\nFix this by doing the same access-\u003eioas sanity as iommufd_access_rw() and\niommufd_access_pin_pages() functions do.",
      "id": "GSD-2024-26785",
      "modified": "2024-02-20T06:02:29.171351Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "cve@kernel.org",
        "ID": "CVE-2024-26785",
        "STATE": "PUBLIC"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Linux",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "9227da7816dd",
                          "version_value": "fc719ecbca45"
                        },
                        {
                          "version_value": "not down converted",
                          "x_cve_json_5_version_data": {
                            "defaultStatus": "affected",
                            "versions": [
                              {
                                "status": "affected",
                                "version": "6.6"
                              },
                              {
                                "lessThan": "6.6",
                                "status": "unaffected",
                                "version": "0",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "6.7.*",
                                "status": "unaffected",
                                "version": "6.7.9",
                                "versionType": "custom"
                              },
                              {
                                "lessThanOrEqual": "*",
                                "status": "unaffected",
                                "version": "6.8",
                                "versionType": "original_commit_for_fix"
                              }
                            ]
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Linux"
            }
          ]
        }
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix protection fault in iommufd_test_syz_conv_iova\n\nSyzkaller reported the following bug:\n\n  general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN\n  KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]\n  Call Trace:\n   lock_acquire\n   lock_acquire+0x1ce/0x4f0\n   down_read+0x93/0x4a0\n   iommufd_test_syz_conv_iova+0x56/0x1f0\n   iommufd_test_access_rw.isra.0+0x2ec/0x390\n   iommufd_test+0x1058/0x1e30\n   iommufd_fops_ioctl+0x381/0x510\n   vfs_ioctl\n   __do_sys_ioctl\n   __se_sys_ioctl\n   __x64_sys_ioctl+0x170/0x1e0\n   do_syscall_x64\n   do_syscall_64+0x71/0x140\n\nThis is because the new iommufd_access_change_ioas() sets access-\u003eioas to\nNULL during its process, so the lock might be gone in a concurrent racing\ncontext.\n\nFix this by doing the same access-\u003eioas sanity as iommufd_access_rw() and\niommufd_access_pin_pages() functions do."
          }
        ]
      },
      "generator": {
        "engine": "bippy-e0c11145c45e"
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "n/a"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://git.kernel.org/stable/c/fc719ecbca45c9c046640d72baddba3d83e0bc0b",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/fc719ecbca45c9c046640d72baddba3d83e0bc0b"
          },
          {
            "name": "https://git.kernel.org/stable/c/cf7c2789822db8b5efa34f5ebcf1621bc0008d48",
            "refsource": "MISC",
            "url": "https://git.kernel.org/stable/c/cf7c2789822db8b5efa34f5ebcf1621bc0008d48"
          }
        ]
      }
    },
    "nvd.nist.gov": {
      "cve": {
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Fix protection fault in iommufd_test_syz_conv_iova\n\nSyzkaller reported the following bug:\n\n  general protection fault, probably for non-canonical address 0xdffffc0000000038: 0000 [#1] SMP KASAN\n  KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7]\n  Call Trace:\n   lock_acquire\n   lock_acquire+0x1ce/0x4f0\n   down_read+0x93/0x4a0\n   iommufd_test_syz_conv_iova+0x56/0x1f0\n   iommufd_test_access_rw.isra.0+0x2ec/0x390\n   iommufd_test+0x1058/0x1e30\n   iommufd_fops_ioctl+0x381/0x510\n   vfs_ioctl\n   __do_sys_ioctl\n   __se_sys_ioctl\n   __x64_sys_ioctl+0x170/0x1e0\n   do_syscall_x64\n   do_syscall_64+0x71/0x140\n\nThis is because the new iommufd_access_change_ioas() sets access-\u003eioas to\nNULL during its process, so the lock might be gone in a concurrent racing\ncontext.\n\nFix this by doing the same access-\u003eioas sanity as iommufd_access_rw() and\niommufd_access_pin_pages() functions do."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: iommufd: Se corrigi\u00f3 falla de protecci\u00f3n en iommufd_test_syz_conv_iova Syzkaller inform\u00f3 el siguiente error: falla de protecci\u00f3n general, probablemente para direcci\u00f3n no can\u00f3nica 0xdffffc0000000038: 0000 [#1] SMP KASAN KASAN: null-ptr- deref en el rango [0x00000000000001c0-0x00000000000001c7] Seguimiento de llamadas: lock_acquire lock_acquire+0x1ce/0x4f0 down_read+0x93/0x4a0 iommufd_test_syz_conv_iova+0x56/0x1f0 iommufd_test_access_rw.isra. 0+0x2ec/0x390 iommufd_test+0x1058/0x1e30 iommufd_fops_ioctl+0x381/0x510 vfs_ioctl __do_sys_ioctl __se_sys_ioctl __x64_sys_ioctl +0x170/0x1e0 do_syscall_x64 do_syscall_64+0x71/0x140 Esto se debe a que el nuevo iommufd_access_change_ioas() establece access-\u0026gt;ioas en NULL durante su proceso, por lo que el bloqueo podr\u00eda desaparecer en un contexto de ejecuci\u00f3n concurrente. Solucione este problema haciendo el mismo acceso-\u0026gt;ioas cordura que hacen las funciones iommufd_access_rw() y iommufd_access_pin_pages()."
          }
        ],
        "id": "CVE-2024-26785",
        "lastModified": "2024-04-04T12:48:41.700",
        "metrics": {},
        "published": "2024-04-04T09:15:08.187",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cf7c2789822db8b5efa34f5ebcf1621bc0008d48"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fc719ecbca45c9c046640d72baddba3d83e0bc0b"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Awaiting Analysis"
      }
    }
  }
}