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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.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-52947coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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