CVE-2022-50080 (GCVE-0-2022-50080)
Vulnerability from cvelistv5
Published
2025-06-18 11:02
Modified
2025-06-18 11:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tee: add overflow check in register_shm_helper() With special lengths supplied by user space, register_shm_helper() has an integer overflow when calculating the number of pages covered by a supplied user space memory region. This causes internal_get_user_pages_fast() a helper function of pin_user_pages_fast() to do a NULL pointer dereference: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 Modules linked in: CPU: 1 PID: 173 Comm: optee_example_a Not tainted 5.19.0 #11 Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015 pc : internal_get_user_pages_fast+0x474/0xa80 Call trace: internal_get_user_pages_fast+0x474/0xa80 pin_user_pages_fast+0x24/0x4c register_shm_helper+0x194/0x330 tee_shm_register_user_buf+0x78/0x120 tee_ioctl+0xd0/0x11a0 __arm64_sys_ioctl+0xa8/0xec invoke_syscall+0x48/0x114 Fix this by adding an an explicit call to access_ok() in tee_shm_register_user_buf() to catch an invalid user space address early.
References
Impacted products
Vendor Product Version
Linux Linux Version: 033ddf12bcf5326b93bd604f50a7474a434a35f9
Version: 033ddf12bcf5326b93bd604f50a7474a434a35f9
Version: 033ddf12bcf5326b93bd604f50a7474a434a35f9
Version: 033ddf12bcf5326b93bd604f50a7474a434a35f9
Version: 033ddf12bcf5326b93bd604f50a7474a434a35f9
Version: 033ddf12bcf5326b93bd604f50a7474a434a35f9
Version: 033ddf12bcf5326b93bd604f50a7474a434a35f9
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tee/tee_shm.c"
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          "vendor": "Linux",
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              "version": "0",
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              "versionType": "semver"
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              "version": "6.0",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
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          "nodes": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntee: add overflow check in register_shm_helper()\n\nWith special lengths supplied by user space, register_shm_helper() has\nan integer overflow when calculating the number of pages covered by a\nsupplied user space memory region.\n\nThis causes internal_get_user_pages_fast() a helper function of\npin_user_pages_fast() to do a NULL pointer dereference:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\n  Modules linked in:\n  CPU: 1 PID: 173 Comm: optee_example_a Not tainted 5.19.0 #11\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n  pc : internal_get_user_pages_fast+0x474/0xa80\n  Call trace:\n   internal_get_user_pages_fast+0x474/0xa80\n   pin_user_pages_fast+0x24/0x4c\n   register_shm_helper+0x194/0x330\n   tee_shm_register_user_buf+0x78/0x120\n   tee_ioctl+0xd0/0x11a0\n   __arm64_sys_ioctl+0xa8/0xec\n   invoke_syscall+0x48/0x114\n\nFix this by adding an an explicit call to access_ok() in\ntee_shm_register_user_buf() to catch an invalid user space address\nearly."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:02:23.003Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b37e0f17653c00b586cdbcdf0dbca475358ecffd"
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          "url": "https://git.kernel.org/stable/c/965333345fe952cc7eebc8e3a565ffc709441af2"
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          "url": "https://git.kernel.org/stable/c/58c008d4d398f792ca67f35650610864725518fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/573ae4f13f630d6660008f1974c0a8a29c30e18a"
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      ],
      "title": "tee: add overflow check in register_shm_helper()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50080",
    "datePublished": "2025-06-18T11:02:23.003Z",
    "dateReserved": "2025-06-18T10:57:27.409Z",
    "dateUpdated": "2025-06-18T11:02:23.003Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50080\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:36.980\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntee: add overflow check in register_shm_helper()\\n\\nWith special lengths supplied by user space, register_shm_helper() has\\nan integer overflow when calculating the number of pages covered by a\\nsupplied user space memory region.\\n\\nThis causes internal_get_user_pages_fast() a helper function of\\npin_user_pages_fast() to do a NULL pointer dereference:\\n\\n  Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010\\n  Modules linked in:\\n  CPU: 1 PID: 173 Comm: optee_example_a Not tainted 5.19.0 #11\\n  Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\\n  pc : internal_get_user_pages_fast+0x474/0xa80\\n  Call trace:\\n   internal_get_user_pages_fast+0x474/0xa80\\n   pin_user_pages_fast+0x24/0x4c\\n   register_shm_helper+0x194/0x330\\n   tee_shm_register_user_buf+0x78/0x120\\n   tee_ioctl+0xd0/0x11a0\\n   __arm64_sys_ioctl+0xa8/0xec\\n   invoke_syscall+0x48/0x114\\n\\nFix this by adding an an explicit call to access_ok() in\\ntee_shm_register_user_buf() to catch an invalid user space address\\nearly.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2f8e79a1a6128214cb9b205a9869341af5dfb16b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/573ae4f13f630d6660008f1974c0a8a29c30e18a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/578c349570d2a912401963783b36e0ec7a25c053\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/58c008d4d398f792ca67f35650610864725518fd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/965333345fe952cc7eebc8e3a565ffc709441af2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b37e0f17653c00b586cdbcdf0dbca475358ecffd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c12f0e6126ad223806a365084e86370511654bf1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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