{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102\n\nA call to listxattr() with a buffer size = 0 returns the actual\nsize of the buffer needed for a subsequent call. When size > 0,\nnfs4_listxattr() does not return an error because either\ngeneric_listxattr() or nfs4_listxattr_nfs4_label() consumes\nexactly all the bytes then size is 0 when calling\nnfs4_listxattr_nfs4_user() which then triggers the following\nkernel BUG:\n\n  [   99.403778] kernel BUG at mm/usercopy.c:102!\n  [   99.404063] Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n  [   99.408463] CPU: 0 PID: 3310 Comm: python3 Not tainted 6.6.0-61.fc40.aarch64 #1\n  [   99.415827] Call trace:\n  [   99.415985]  usercopy_abort+0x70/0xa0\n  [   99.416227]  __check_heap_object+0x134/0x158\n  [   99.416505]  check_heap_object+0x150/0x188\n  [   99.416696]  __check_object_size.part.0+0x78/0x168\n  [   99.416886]  __check_object_size+0x28/0x40\n  [   99.417078]  listxattr+0x8c/0x120\n  [   99.417252]  path_listxattr+0x78/0xe0\n  [   99.417476]  __arm64_sys_listxattr+0x28/0x40\n  [   99.417723]  invoke_syscall+0x78/0x100\n  [   99.417929]  el0_svc_common.constprop.0+0x48/0xf0\n  [   99.418186]  do_el0_svc+0x24/0x38\n  [   99.418376]  el0_svc+0x3c/0x110\n  [   99.418554]  el0t_64_sync_handler+0x120/0x130\n  [   99.418788]  el0t_64_sync+0x194/0x198\n  [   99.418994] Code: aa0003e3 d000a3e0 91310000 97f49bdb (d4210000)\n\nIssue is reproduced when generic_listxattr() returns 'system.nfs4_acl',\nthus calling lisxattr() with size = 16 will trigger the bug.\n\nAdd check on nfs4_listxattr() to return ERANGE error when it is\ncalled with size > 0 and the return value is greater than size."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/nfs/nfs4proc.c"
               ],
               "versions": [
                  {
                     "version": "012a211abd5d",
                     "lessThan": "4403438eaca6",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "012a211abd5d",
                     "lessThan": "9d52865ff282",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "012a211abd5d",
                     "lessThan": "06e828b3f1b2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "012a211abd5d",
                     "lessThan": "79cdcc765969",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "012a211abd5d",
                     "lessThan": "80365c9f9601",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "012a211abd5d",
                     "lessThan": "23bfecb4d852",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "012a211abd5d",
                     "lessThan": "251a658bbfce",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/nfs/nfs4proc.c"
               ],
               "versions": [
                  {
                     "version": "5.9",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.9",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.214",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.153",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.83",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.23",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7.11",
                     "lessThanOrEqual": "6.7.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8.2",
                     "lessThanOrEqual": "6.8.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.9",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/4403438eaca6e91f02d272211c4d6b045092396b"
            },
            {
               "url": "https://git.kernel.org/stable/c/9d52865ff28245fc2134da9f99baff603a24407a"
            },
            {
               "url": "https://git.kernel.org/stable/c/06e828b3f1b206de08ef520fc46a40b22e1869cb"
            },
            {
               "url": "https://git.kernel.org/stable/c/79cdcc765969d23f4e3d6ea115660c3333498768"
            },
            {
               "url": "https://git.kernel.org/stable/c/80365c9f96015bbf048fdd6c8705d3f8770132bf"
            },
            {
               "url": "https://git.kernel.org/stable/c/23bfecb4d852751d5e403557dd500bb563313baf"
            },
            {
               "url": "https://git.kernel.org/stable/c/251a658bbfceafb4d58c76b77682c8bf7bcfad65"
            }
         ],
         "title": "NFSv4.2: fix nfs4_listxattr kernel BUG at mm/usercopy.c:102",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-26870",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}