Critical 9.1Published Jul 16, 2026

CVE-2026-15422SCTP needs to better-check INIT ACK chunk parameters

Updated under an hour ago (Oct 26, 2026, 6:10 AM ET)

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Exploited in the last 30 days

The illumos SCTP inbound path performs association lookup for INIT ACK chunks without adequately validating the address parameters carried in the chunk. Since this lookup runs during packet classification (i.e. before SCTP integrity checks or IPsec policy are applied) a remote, unauthenticated attacker can send a crafted SCTP INIT ACK packet with malformed address parameters to cause an out-of-bounds access and kernel heap corruption, which may lead to remote code execution. The flaw has existed since 2010 (illumos-gate commit a5407c02), and affects any illumos distribution prior to illumos-gate commit 53a3efde.

CVSS: 9.1 CRITICAL (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:U/S:P/AU:Y/R:U/V:C/RE:H/U:Red
Weakness (CWE): CWE-122, CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: illumos
NVD analysis: Deferred
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

illumos illumos-gate illumos:gate (from the name)	from a5407c02d5ed61b29481b9b71f1307d7ebec9e5c before 53a3efdeff8e6745bbfb69c5360f94962fb79e75; fixed at 53a3efdeff8e6745bbfb69c5360f94962fb79e75	CNA record
OmniOS OmniOS omnios:omnios (from the name)	from r151058 before r151058j; fixed at r151058j; from r151056 before r151056aj; fixed at r151056aj; from r151054 before r151054bj; fixed at r151054bj; from any before r151054	CNA record
Triton Data Center SmartOS triton_data_center:smartos (from the name)	from any before 202060709; fixed at 20260709	CNA record

References

https://illumos.topicbox.com/groups/developer/Ta1a8e2e1f7f928df/18117-sctp-needs-to-better-check-init-ack-chunk-parametersmailing-list
https://illumos.org/issues/18117issue-tracking
https://github.com/illumos/illumos-gate/commit/53a3efdeff8e6745bbfb69c5360f94962fb79e75patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.