{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: extable: fix load_unaligned_zeropad() reg indices\n\nIn ex_handler_load_unaligned_zeropad() we erroneously extract the data and\naddr register indices from ex->type rather than ex->data. As ex->type will\ncontain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4):\n * We'll always treat X0 as the address register, since EX_DATA_REG_ADDR is\n   extracted from bits [9:5]. Thus, we may attempt to dereference an\n   arbitrary address as X0 may hold an arbitrary value.\n * We'll always treat X4 as the data register, since EX_DATA_REG_DATA is\n   extracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary\n   behaviour within load_unaligned_zeropad() and its caller.\n\nFix this by extracting both values from ex->data as originally intended.\n\nOn an MTE-enabled QEMU image we are hitting the following crash:\n Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n Call trace:\n  fixup_exception+0xc4/0x108\n  __do_kernel_fault+0x3c/0x268\n  do_tag_check_fault+0x3c/0x104\n  do_mem_abort+0x44/0xf4\n  el1_abort+0x40/0x64\n  el1h_64_sync_handler+0x60/0xa0\n  el1h_64_sync+0x7c/0x80\n  link_path_walk+0x150/0x344\n  path_openat+0xa0/0x7dc\n  do_filp_open+0xb8/0x168\n  do_sys_openat2+0x88/0x17c\n  __arm64_sys_openat+0x74/0xa0\n  invoke_syscall+0x48/0x148\n  el0_svc_common+0xb8/0xf8\n  do_el0_svc+0x28/0x88\n  el0_svc+0x24/0x84\n  el0t_64_sync_handler+0x88/0xec\n  el0t_64_sync+0x1b4/0x1b8\n Code: f8695a69 71007d1f 540000e0 927df12a (f940014a)"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "arch/arm64/mm/extable.c"
               ],
               "versions": [
                  {
                     "version": "753b32368705",
                     "lessThan": "47fe7a1c5e3e",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "753b32368705",
                     "lessThan": "3758a6c74e08",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "arch/arm64/mm/extable.c"
               ],
               "versions": [
                  {
                     "version": "5.16",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.16",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.16.5",
                     "lessThanOrEqual": "5.16.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.17",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/47fe7a1c5e3e011eeb4ab79f2d54a794fdd1c3eb"
            },
            {
               "url": "https://git.kernel.org/stable/c/3758a6c74e08bdc15ccccd6872a6ad37d165239a"
            }
         ],
         "title": "arm64: extable: fix load_unaligned_zeropad() reg indices",
         "x_generator": {
            "engine": "bippy-7d53e8ef8be4"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2022-48762",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}