CVE-2026-53274: net/smc: fix sleep-inside-lock in __smc_setsockopt() causing local DoS

mediumCVSS 5.5CVE-2026-53274

CSIRTS triage

Denial of service

What: The net/smc subsystem has a sleep-inside-lock issue in the __smc_setsockopt function that can cause local DoS.
Who is affected: Users of the net/smc functionality are affected.
Urgency: Medium urgency as it could lead to local denial of service, but no active exploitation is reported.
Action: Monitor for updates and apply patches 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 5.5
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53274

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-2026-532740.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53274	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownMultiple vulnerabilities in Debian LTS Linux kernel (July 10, 2026)cert-fr-avis
unknownMultiple vulnerabilities in Microsoft Azure Linux (June 29, 2026)cert-fr-avis

Recent advisories for net/smc

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-2026-52941: net/smc: avoid NULL deref of conn->lnk in smc_msg_event tracepointmsrc · 2026-06-09
highCVE-2026-46330: Revert "net/smc: Introduce TCP ULP support"msrc · 2026-06-09