CVE-2026-98846 (GCVE-0-2026-98846)
Vulnerability from cvelistv5
Published
2026-10-18 15:50
Modified
2026-10-21 12:57
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: check RCV_SHUTDOWN after the sendmsg connect wait sctp_wait_for_connect() drops the socket lock while it sleeps. An out-of-the-blue ABORT can then be processed from the socket backlog and unlink the association. If a concurrent shutdown(fd, SHUT_RD) sets RCV_SHUTDOWN, the waiter breaks with err == 0 before checking asoc->base.dead. Its final sctp_association_put() can then free the association, leaving sctp_sendmsg_to_asoc() to continue with a dangling pointer. Check RCV_SHUTDOWN along with the wait error in sctp_sendmsg_to_asoc() before using the association again. The check only accesses the socket, so it needs no additional association reference. Return the existing -ESRCH so that sctp_sendmsg() skips freeing a new association that may already have been destroyed. Keep sctp_wait_for_connect() unchanged to preserve its behavior for the connect() caller.
References
Impacted products
Vendor Product Version
Linux Linux Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
Version: 668c9beb9020d5834ee9e43c208190a07d2b1928
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/socket.c"
          ],
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        },
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.16"
            },
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              "status": "unaffected",
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              "version": "6.18.56",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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                {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: check RCV_SHUTDOWN after the sendmsg connect wait\n\nsctp_wait_for_connect() drops the socket lock while it sleeps. An\nout-of-the-blue ABORT can then be processed from the socket backlog and\nunlink the association. If a concurrent shutdown(fd, SHUT_RD) sets\nRCV_SHUTDOWN, the waiter breaks with err == 0 before checking\nasoc-\u003ebase.dead. Its final sctp_association_put() can then free the\nassociation, leaving sctp_sendmsg_to_asoc() to continue with a dangling\npointer.\n\nCheck RCV_SHUTDOWN along with the wait error in sctp_sendmsg_to_asoc()\nbefore using the association again. The check only accesses the socket,\nso it needs no additional association reference. Return the existing\n-ESRCH so that sctp_sendmsg() skips freeing a new association that may\nalready have been destroyed.\n\nKeep sctp_wait_for_connect() unchanged to preserve its behavior for the\nconnect() caller."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:57:26.471Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1bef1944ef15a40797305bf916827b04df6307ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8f972b1759d26bbefe4c524caae1ed7c8a593bd"
        },
        {
          "url": "https://git.kernel.org/stable/c/e701345d886e831fb593a0870d69c8c5de6fc938"
        },
        {
          "url": "https://git.kernel.org/stable/c/222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669"
        },
        {
          "url": "https://git.kernel.org/stable/c/4f1da630d13de0370e2f6361f961f1c8b384af1c"
        }
      ],
      "title": "sctp: check RCV_SHUTDOWN after the sendmsg connect wait",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98846",
    "datePublished": "2026-10-18T15:50:34.714Z",
    "dateReserved": "2026-09-25T10:25:14.373Z",
    "dateUpdated": "2026-10-21T12:57:26.471Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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