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

Severity: critical (CVSS 9.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-16 · updated 2026-07-17
Weakness: CWE-122

Description

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.

Affected products

illumos-gate: all versions
OmniOS: from r151058 before r151058j; from r151056 before r151056aj; from r151054 before r151054bj; from any before r151054 — fixed in r151054, r151054bj, r151056aj, r151058j
Triton Data Center SmartOS: from any before 202060709 — fixed in 202060709

How to fix

Upgrade to a fixed version: OmniOS r151054, r151054bj, r151056aj, r151058j; Triton Data Center SmartOS 202060709. Check the vendor advisory for mitigations.

References

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