{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwatch_queue: Fix filter limit check\n\nIn watch_queue_set_filter(), there are a couple of places where we check\nthat the filter type value does not exceed what the type_filter bitmap\ncan hold.  One place calculates the number of bits by:\n\n   if (tf[i].type >= sizeof(wfilter->type_filter) * 8)\n\nwhich is fine, but the second does:\n\n   if (tf[i].type >= sizeof(wfilter->type_filter) * BITS_PER_LONG)\n\nwhich is not.  This can lead to a couple of out-of-bounds writes due to\na too-large type:\n\n (1) __set_bit() on wfilter->type_filter\n (2) Writing more elements in wfilter->filters[] than we allocated.\n\nFix this by just using the proper WATCH_TYPE__NR instead, which is the\nnumber of types we actually know about.\n\nThe bug may cause an oops looking something like:\n\n  BUG: KASAN: slab-out-of-bounds in watch_queue_set_filter+0x659/0x740\n  Write of size 4 at addr ffff88800d2c66bc by task watch_queue_oob/611\n  ...\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x45/0x59\n   print_address_description.constprop.0+0x1f/0x150\n   ...\n   kasan_report.cold+0x7f/0x11b\n   ...\n   watch_queue_set_filter+0x659/0x740\n   ...\n   __x64_sys_ioctl+0x127/0x190\n   do_syscall_64+0x43/0x90\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n  Allocated by task 611:\n   kasan_save_stack+0x1e/0x40\n   __kasan_kmalloc+0x81/0xa0\n   watch_queue_set_filter+0x23a/0x740\n   __x64_sys_ioctl+0x127/0x190\n   do_syscall_64+0x43/0x90\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\n  The buggy address belongs to the object at ffff88800d2c66a0\n   which belongs to the cache kmalloc-32 of size 32\n  The buggy address is located 28 bytes inside of\n   32-byte region [ffff88800d2c66a0, ffff88800d2c66c0)"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "include/linux/watch_queue.h",
                  "kernel/watch_queue.c"
               ],
               "versions": [
                  {
                     "version": "c73be61cede5",
                     "lessThan": "648895da69ce",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "c73be61cede5",
                     "lessThan": "1b09f28f70a5",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "c73be61cede5",
                     "lessThan": "b36588ebbcef",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "c73be61cede5",
                     "lessThan": "c993ee0f9f81",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "include/linux/watch_queue.h",
                  "kernel/watch_queue.c"
               ],
               "versions": [
                  {
                     "version": "5.8",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.8",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.106",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.29",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.16.15",
                     "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/648895da69ced90ca770fd941c3d9479a9d72c16"
            },
            {
               "url": "https://git.kernel.org/stable/c/1b09f28f70a5046acd64138075ae3f095238b045"
            },
            {
               "url": "https://git.kernel.org/stable/c/b36588ebbcef74583824c08352e75838d6fb4ff2"
            },
            {
               "url": "https://git.kernel.org/stable/c/c993ee0f9f81caf5767a50d1faeba39a0dc82af2"
            }
         ],
         "title": "watch_queue: Fix filter limit check",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2022-48847",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}