CVE-2026-53246: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing

highCVSS 7.8CVE-2026-53246

CSIRTS triage

Other

What: The vulnerability involves validating the length of a cached peer INIT chunk during COOKIE_ECHO processing.
Who is affected: Deployments using SCTP may be affected.
Urgency: Remediation is urgent due to the high severity rating of 7.8.
Action: Apply the necessary patches as they become available.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53246

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-2026-532460.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 38% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53246	coverage & exploitation status	NVD · CVE.org

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.

mediumCVE-2026-52929: sctp: stream: fully roll back denied add-stream statemsrc · 2026-06-09
highCVE-2026-49759: Stack buffer overflow in SCTP error cause parsing in inet_drv allows remote VM crashmsrc · 2026-06-09
highCVE-2026-52917: sctp: diag: reject stale associations in dump_one pathmsrc · 2026-06-09
highCVE-2026-52924: sctp: purge outqueue on stale COOKIE-ECHO handlingmsrc · 2026-06-09
mediumCVE-2026-53225: sctp: fix uninit-value in __sctp_rcv_asconf_lookup()msrc · 2026-06-09
mediumCVE-2026-53070: sctp: disable BH before calling udp_tunnel_xmit_skb()msrc · 2026-06-09