CVE-2026-74688: sctp: clear control chunk transport if it is being removed

mediumCVSS 5.9CVE-2026-74688

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: SCTP control chunk processing does not clear the transport pointer when the transport is being removed, causing use-after-free.
Who is affected: Systems using SCTP protocol with active connections during transport removal.
Urgency: Medium priority; CVSS 5.9 indicates moderate severity; not currently exploited.
Action: Apply kernel patch to clear control chunk transport during removal or update to patched kernel version.

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

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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-2026-74688

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-2026-746880.50% 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

CVE	CSIRTS overview	External
CVE-2026-74688	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

criticalCVE-2026-74688: In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk …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.

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criticalCVE-2026-74688: In the Linux kernel, the following vulnerability has been resolved: sctp: clear control chunk …nvd · 2026-08-22
highCVE-2026-74624: In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: d…nvd · 2026-08-22
criticalCVE-2026-74588: In the Linux kernel, the following vulnerability has been resolved: sctp: keep chunk->transpor…nvd · 2026-08-22
criticalCVE-2026-74587: In the Linux kernel, the following vulnerability has been resolved: sctp: fix use-after-free o…nvd · 2026-08-22