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Vulnerability record · CVE-2026-15422 · published 16 July 2026

CVE-2026-15422: Heap-based buffer overflow vulnerability

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.

9.1 CVSS 4.0 Critical EPSS 0.88% · top 42.5% CWE-122 · Heap-based buffer overflowCWE-787 · Out-of-bounds write Deferred
9.1CVSS 4.0 base score
0.88%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
17 Jul 2026Last modified by NVD

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.

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:P/AU:Y/R:

References

LinkTags
https://github.com/illumos/illumos-gate/commit/53a3efdeff8e6745bbfb69c5360f94962fb79e75
https://illumos.org/issues/18117
https://illumos.topicbox.com/groups/developer/Ta1a8e2e1f7f928df/18117-sctp-needs-to-better-check-init-ack-chunk-paramete

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Source: NIST National Vulnerability Database (record CVE-2026-15422), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.