CVE-2026-74587: sctp: fix use-after-free of cached ASCONF chunk

CSIRTS triage

What

Use-after-free vulnerability in SCTP cached ASCONF chunk handling.

Who is affected

Systems running vulnerable Linux kernel versions with SCTP enabled processing address configuration messages.

Urgency

Medium priority; use-after-free in protocol handling requires timely remediation.

Action

Apply kernel security update addressing CVE-2026-74587 when available.

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

Details

Source

Microsoft Security Response Center (INTL · vendor-psirt · site)

Severity

medium — CVSS 5.9

Published

2026-08-11

Exploitation

Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74587

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-2026-745870.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• medium[NEW] [medium] Linux Kernel: Multiple vulnerabilities allow unspecified attackcert-bund
• criticalCVE-2026-74587: In the Linux kernel, the following vulnerability has been resolved: sctp: fix use-after-free o…nvd

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