CVE-2026-15422CWE-122CWE-787

SCTP needs to better-check INIT ACK chunk parameters

Critical · published July 16, 2026

CVSS v4.0
9.1
EPSS
1%
Percentile
58.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.1 · CRITICAL
Vector
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
EPSS
0.00882 · 58.8th percentile
Weaknesses
CWE-122 · Heap-based Buffer Overflow; CWE-787 · Out-of-bounds Write
Published
2026-07-16T19:29Z
EPSS history
Timeline
  • 16 JUL 19:29Z
    SCTP needs to better-check INIT ACK chunk parameters
    cvelistv5