{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: vmalloc: ensure vmap_block is initialised before adding to queue\n\nCommit 8c61291fd850 (\"mm: fix incorrect vbq reference in\npurge_fragmented_block\") extended the 'vmap_block' structure to contain a\n'cpu' field which is set at allocation time to the id of the initialising\nCPU.\n\nWhen a new 'vmap_block' is being instantiated by new_vmap_block(), the\npartially initialised structure is added to the local 'vmap_block_queue'\nxarray before the 'cpu' field has been initialised.  If another CPU is\nconcurrently walking the xarray (e.g.  via vm_unmap_aliases()), then it\nmay perform an out-of-bounds access to the remote queue thanks to an\nuninitialised index.\n\nThis has been observed as UBSAN errors in Android:\n\n | Internal error: UBSAN: array index out of bounds: 00000000f2005512 [#1] PREEMPT SMP\n |\n | Call trace:\n |  purge_fragmented_block+0x204/0x21c\n |  _vm_unmap_aliases+0x170/0x378\n |  vm_unmap_aliases+0x1c/0x28\n |  change_memory_common+0x1dc/0x26c\n |  set_memory_ro+0x18/0x24\n |  module_enable_ro+0x98/0x238\n |  do_init_module+0x1b0/0x310\n\nMove the initialisation of 'vb->cpu' in new_vmap_block() ahead of the\naddition to the xarray."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "mm/vmalloc.c"
               ],
               "versions": [
                  {
                     "version": "88e0ad40d08a",
                     "lessThan": "1b2770e27d6d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "8c61291fd850",
                     "lessThan": "6cf74e0e5e3a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "8c61291fd850",
                     "lessThan": "3e3de7947c75",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "mm/vmalloc.c"
               ],
               "versions": [
                  {
                     "version": "6.10",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "6.10",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.51",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10.10",
                     "lessThanOrEqual": "6.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.11",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/1b2770e27d6d952f491bb362b657e5b2713c3efd"
            },
            {
               "url": "https://git.kernel.org/stable/c/6cf74e0e5e3ab5d5c9defb4c73dad54d52224671"
            },
            {
               "url": "https://git.kernel.org/stable/c/3e3de7947c751509027d26b679ecd243bc9db255"
            }
         ],
         "title": "mm: vmalloc: ensure vmap_block is initialised before adding to queue",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-46847",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}