{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: do asoc update earlier in sctp_sf_do_dupcook_a\n\nThere's a panic that occurs in a few of envs, the call trace is as below:\n\n  [] general protection fault, ... 0x29acd70f1000a: 0000 [#1] SMP PTI\n  [] RIP: 0010:sctp_ulpevent_notify_peer_addr_change+0x4b/0x1fa [sctp]\n  []  sctp_assoc_control_transport+0x1b9/0x210 [sctp]\n  []  sctp_do_8_2_transport_strike.isra.16+0x15c/0x220 [sctp]\n  []  sctp_cmd_interpreter.isra.21+0x1231/0x1a10 [sctp]\n  []  sctp_do_sm+0xc3/0x2a0 [sctp]\n  []  sctp_generate_timeout_event+0x81/0xf0 [sctp]\n\nThis is caused by a transport use-after-free issue. When processing a\nduplicate COOKIE-ECHO chunk in sctp_sf_do_dupcook_a(), both COOKIE-ACK\nand SHUTDOWN chunks are allocated with the transort from the new asoc.\nHowever, later in the sideeffect machine, the old asoc is used to send\nthem out and old asoc's shutdown_last_sent_to is set to the transport\nthat SHUTDOWN chunk attached to in sctp_cmd_setup_t2(), which actually\nbelongs to the new asoc. After the new_asoc is freed and the old asoc\nT2 timeout, the old asoc's shutdown_last_sent_to that is already freed\nwould be accessed in sctp_sf_t2_timer_expire().\n\nThanks Alexander and Jere for helping dig into this issue.\n\nTo fix it, this patch is to do the asoc update first, then allocate\nthe COOKIE-ACK and SHUTDOWN chunks with the 'updated' old asoc. This\nwould make more sense, as a chunk from an asoc shouldn't be sent out\nwith another asoc. We had fixed quite a few issues caused by this."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/sctp/sm_statefuns.c"
               ],
               "versions": [
                  {
                     "version": "db8bf823e70f",
                     "lessThan": "d624f2991b97",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "a204d577be70",
                     "lessThan": "b1b31948c0af",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "145cb2f7177d",
                     "lessThan": "f01988ecf365",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "145cb2f7177d",
                     "lessThan": "61b877bad9bb",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "145cb2f7177d",
                     "lessThan": "0bfd913c2121",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "145cb2f7177d",
                     "lessThan": "35b4f24415c8",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "net/sctp/sm_statefuns.c"
               ],
               "versions": [
                  {
                     "version": "5.7",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.7",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.191",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.120",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.38",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.11.22",
                     "lessThanOrEqual": "5.11.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.12.5",
                     "lessThanOrEqual": "5.12.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.13",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/d624f2991b977821375fbd56c91b0c91d456a697"
            },
            {
               "url": "https://git.kernel.org/stable/c/b1b31948c0af44628e43353828453461bb74098f"
            },
            {
               "url": "https://git.kernel.org/stable/c/f01988ecf3654f805282dce2d3bb9afe68d2691e"
            },
            {
               "url": "https://git.kernel.org/stable/c/61b877bad9bb0d82b7d8841be50872557090a704"
            },
            {
               "url": "https://git.kernel.org/stable/c/0bfd913c2121b3d553bfd52810fe6061d542d625"
            },
            {
               "url": "https://git.kernel.org/stable/c/35b4f24415c854cd718ccdf38dbea6297f010aae"
            }
         ],
         "title": "sctp: do asoc update earlier in sctp_sf_do_dupcook_a",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-46999",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}