{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: use rcu-safe version of ipv6_get_lladdr()\n\nSome time ago 8965779d2c0e (\"ipv6,mcast: always hold idev->lock before mca_lock\")\nswitched ipv6_get_lladdr() to __ipv6_get_lladdr(), which is rcu-unsafe\nversion. That was OK, because idev->lock was held for these codepaths.\n\nIn 88e2ca308094 (\"mld: convert ifmcaddr6 to RCU\") these external locks were\nremoved, so we probably need to restore the original rcu-safe call.\n\nOtherwise, we occasionally get a machine crashed/stalled with the following\nin dmesg:\n\n[ 3405.966610][T230589] general protection fault, probably for non-canonical address 0xdead00000000008c: 0000 [#1] SMP NOPTI\n[ 3405.982083][T230589] CPU: 44 PID: 230589 Comm: kworker/44:3 Tainted: G           O      5.15.19-cloudflare-2022.2.1 #1\n[ 3405.998061][T230589] Hardware name: SUPA-COOL-SERV\n[ 3406.009552][T230589] Workqueue: mld mld_ifc_work\n[ 3406.017224][T230589] RIP: 0010:__ipv6_get_lladdr+0x34/0x60\n[ 3406.025780][T230589] Code: 57 10 48 83 c7 08 48 89 e5 48 39 d7 74 3e 48 8d 82 38 ff ff ff eb 13 48 8b 90 d0 00 00 00 48 8d 82 38 ff ff ff 48 39 d7 74 22 <66> 83 78 32 20 77 1b 75 e4 89 ca 23 50 2c 75 dd 48 8b 50 08 48 8b\n[ 3406.055748][T230589] RSP: 0018:ffff94e4b3fc3d10 EFLAGS: 00010202\n[ 3406.065617][T230589] RAX: dead00000000005a RBX: ffff94e4b3fc3d30 RCX: 0000000000000040\n[ 3406.077477][T230589] RDX: dead000000000122 RSI: ffff94e4b3fc3d30 RDI: ffff8c3a31431008\n[ 3406.089389][T230589] RBP: ffff94e4b3fc3d10 R08: 0000000000000000 R09: 0000000000000000\n[ 3406.101445][T230589] R10: ffff8c3a31430000 R11: 000000000000000b R12: ffff8c2c37887100\n[ 3406.113553][T230589] R13: ffff8c3a39537000 R14: 00000000000005dc R15: ffff8c3a31431000\n[ 3406.125730][T230589] FS:  0000000000000000(0000) GS:ffff8c3b9fc80000(0000) knlGS:0000000000000000\n[ 3406.138992][T230589] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 3406.149895][T230589] CR2: 00007f0dfea1db60 CR3: 000000387b5f2000 CR4: 0000000000350ee0\n[ 3406.162421][T230589] Call Trace:\n[ 3406.170235][T230589]  <TASK>\n[ 3406.177736][T230589]  mld_newpack+0xfe/0x1a0\n[ 3406.186686][T230589]  add_grhead+0x87/0xa0\n[ 3406.195498][T230589]  add_grec+0x485/0x4e0\n[ 3406.204310][T230589]  ? newidle_balance+0x126/0x3f0\n[ 3406.214024][T230589]  mld_ifc_work+0x15d/0x450\n[ 3406.223279][T230589]  process_one_work+0x1e6/0x380\n[ 3406.232982][T230589]  worker_thread+0x50/0x3a0\n[ 3406.242371][T230589]  ? rescuer_thread+0x360/0x360\n[ 3406.252175][T230589]  kthread+0x127/0x150\n[ 3406.261197][T230589]  ? set_kthread_struct+0x40/0x40\n[ 3406.271287][T230589]  ret_from_fork+0x22/0x30\n[ 3406.280812][T230589]  </TASK>\n[ 3406.288937][T230589] Modules linked in: ... [last unloaded: kheaders]\n[ 3406.476714][T230589] ---[ end trace 3525a7655f2f3b9e ]---"
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "include/net/addrconf.h",
                  "net/ipv6/addrconf.c",
                  "net/ipv6/mcast.c"
               ],
               "versions": [
                  {
                     "version": "88e2ca308094",
                     "lessThan": "3e11ef1903cf",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "88e2ca308094",
                     "lessThan": "27f567c84f44",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "88e2ca308094",
                     "lessThan": "26394fc118d6",
                     "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/net/addrconf.h",
                  "net/ipv6/addrconf.c",
                  "net/ipv6/mcast.c"
               ],
               "versions": [
                  {
                     "version": "5.13",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.13",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.25",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.16.11",
                     "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/3e11ef1903cf6c2fba35594b193a3570854d9e9e"
            },
            {
               "url": "https://git.kernel.org/stable/c/27f567c84f446048670376827e356f9c92033bf9"
            },
            {
               "url": "https://git.kernel.org/stable/c/26394fc118d6115390bd5b3a0fb17096271da227"
            }
         ],
         "title": "ipv6: mcast: use rcu-safe version of ipv6_get_lladdr()",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2022-48785",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}