CVE-2026-98846 (GCVE-0-2026-98846)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:50 – Updated: 2026-10-30 12:40
VLAI
Title
sctp: check RCV_SHUTDOWN after the sendmsg connect wait
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 668c9beb9020d5834ee9e43c208190a07d2b1928 , < 7f798168c54455559da0f7a377a23ab7019fec35 (git)
Affected: 668c9beb9020d5834ee9e43c208190a07d2b1928 , < fe5a23c76fc48b711eb7d6f3462c994e34da36f9 (git)
Affected: 668c9beb9020d5834ee9e43c208190a07d2b1928 , < 1e7cd89975fa3b11ebd7e1bbb4648a71c0e0e2d4 (git)
Affected: 668c9beb9020d5834ee9e43c208190a07d2b1928 , < 1bef1944ef15a40797305bf916827b04df6307ca (git)
Affected: 668c9beb9020d5834ee9e43c208190a07d2b1928 , < e8f972b1759d26bbefe4c524caae1ed7c8a593bd (git)
Affected: 668c9beb9020d5834ee9e43c208190a07d2b1928 , < e701345d886e831fb593a0870d69c8c5de6fc938 (git)
Affected: 668c9beb9020d5834ee9e43c208190a07d2b1928 , < 222c41e0f50f1d5028be9baf0e1dcfc0bfa7f669 (git)
Affected: 668c9beb9020d5834ee9e43c208190a07d2b1928 , < 4f1da630d13de0370e2f6361f961f1c8b384af1c (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.273 , ≤ 5.10.* (semver)
Unaffected: 5.15.224 , ≤ 5.15.* (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.113 , ≤ 6.12.* (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.10 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "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."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:40:09.817Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98846",
    "datePublished": "2026-10-18T15:50:34.714Z",
    "dateReserved": "2026-09-25T10:25:14.373Z",
    "dateUpdated": "2026-10-30T12:40:09.817Z",
    "state": "PUBLISHED"
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      "date": "2026-11-10",
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      "status": "final",
      "title": "sctp: check RCV_SHUTDOWN after the sendmsg connect wait",
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            "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."
          }
        ],
        "id": "CVE-2026-98846",
        "lastModified": "2026-10-30T13:21:30.343",
        "metrics": {},
        "published": "2026-10-18T16:17:38.947",
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T03:16:25+00:00",
      "cve": "CVE-2026-98846",
      "id": "CVE-2026-98846",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "175",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: check RCV_SHUTDOWN after the sendmsg connect wait",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98846.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-21T23:42:51Z",
      "cve": "CVE-2026-98846",
      "id": "CVE-2026-98846",
      "initial_release_date": "2026-10-21T16:51:17Z",
      "product_status:known_affected": "158",
      "product_status:known_not_affected": "190",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98846",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98846.json",
      "version": "3"
    }
  }
}



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  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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