CVE-2026-15422

Summary

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 Software

VendorProductVersion RangeStatus
illumosillumos-gatea5407c02d5ed61b29481b9b71f1307d7ebec9e5c < 53a3efdeff8e6745bbfb69c5360f94962fb79e75affected
OmniOSOmniOSr151058 < r151058jaffected
OmniOSOmniOSr151056 < r151056ajaffected
OmniOSOmniOSr151054 < r151054bjaffected
OmniOSOmniOSany < r151054affected
Triton Data CenterSmartOSany < 202060709affected

Weaknesses

  • CWE-122: CWE-122 Heap-based buffer overflow
  • CWE-787: CWE-787 Out-of-bounds write

Workarounds

In order of recommendation:

1.) Hotpatch the faulty SCTP input path.  See the illumos issue for the hotpatch technique. If the function to patch does not exist, the issue has been fixed. If the output does not match the illumos issue's output, contact developers@lists.illumos.org.

2.) Use ipfilter per-netstack or perimeter firewalls to drop SCTP packets. IMPORTANT NOTE: any entity inside an SCTP-dropping firewall perimeter can still attack.

References