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CVE-2026-64590: dma-buf/udmabuf: skip redundant cpu sync to fix cacheline EEXIST warning

highCVSS 7.1CVE-2026-64590

CSIRTS triage

vendor: Linuxproduct: Linux KernelDenial of service
What
Redundant CPU synchronization in dma-buf/udmabuf causes cacheline EEXIST warnings and potential denial of service.
Who is affected
Systems using DMA buffer and udmabuf interfaces in affected kernel versions are impacted.
Urgency
High severity (CVSS 7.1) and not exploited; prompt patching is warranted to prevent service disruption.
Action
Apply kernel patch that skips redundant CPU sync in dma-buf/udmabuf handling.

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
high — CVSS 7.1
Published
2026-08-11
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64590

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-2026-64590coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for dma-buf/udmabuf

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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