CVE-2026-52947: net: qrtr: fix refcount saturation and potential UAF in qrtr_port_remove

criticalCVSS 9.8CVE-2026-52947

CSIRTS triage

Privilege escalation

What: There is a critical vulnerability related to reference count saturation and potential use-after-free in 'qrtr_port_remove'.
Who is affected: Deployments using the affected net subsystem.
Urgency: Remediation is critical due to the high severity and potential for exploitation.
Action: Apply the relevant patches to address this vulnerability.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 9.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-52947

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-2026-529470.14% 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-2026-52947	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
high[UPDATE] [high] Linux Kernel: Multiple vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Microsoft Azure Linux (June 29, 2026)cert-fr-avis

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