CVE-2026-53275: ipv6: mcast: Fix use-after-free when processing MLD queries

highCVSS 7CVE-2026-53275

CSIRTS triage

Other

What: A use-after-free vulnerability exists when processing MLD queries in IPv6 multicast.
Who is affected: Deployments using the affected IPv6 multicast functionality are at risk.
Urgency: Remediation is urgent due to the high severity and potential for exploitation.
Action: Apply the relevant patches for the affected systems.

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
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53275

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-2026-532750.25% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53275	coverage & exploitation status	NVD · CVE.org

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