CVE-2026-80890: sctp: reject stale cookies with mismatched verification tags

mediumCVSS 4.8CVE-2026-80890

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 4.8
Published: 2026-09-08
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80890

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-808900.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-80890	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownCVE-2026-80890: In the Linux kernel, the following vulnerability has been resolved: sctp: reject stale cookies…nvd

Recent advisories for sctp

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-89479: In the Linux kernel, the following vulnerability has been resolved: sctp: stop processing a pa…nvd · 2026-09-11
unknownCVE-2026-89478: In the Linux kernel, the following vulnerability has been resolved: sctp: drop a chunk if its …nvd · 2026-09-11
unknownCVE-2026-89477: In the Linux kernel, the following vulnerability has been resolved: sctp: fix NULL deref on un…nvd · 2026-09-11
unknownCVE-2026-89476: In the Linux kernel, the following vulnerability has been resolved: sctp: fix stream->outcnt u…nvd · 2026-09-11
unknownCVE-2026-80890: In the Linux kernel, the following vulnerability has been resolved: sctp: reject stale cookies…nvd · 2026-09-04
highCVE-2026-80717: In the Linux kernel, the following vulnerability has been resolved: sctp: validate Adaptation …nvd · 2026-08-28