CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2026-43161: iommu/vt-d: Skip dev-iotlb flush for inaccessible PCIe device without scalable mode

mediumCVSS 5.5CVE-2026-43161

CSIRTS triage

vendor: Linuxproduct: Linux KernelDenial of service
What
IOMMU VT-d subsystem fails to skip device I/O TLB flush for inaccessible PCIe devices without scalable mode.
Who is affected
Systems using Intel VT-d IOMMU with inaccessible PCIe devices and non-scalable mode configuration.
Urgency
Medium priority; not currently exploited but may cause system instability.
Action
Update to patched Linux kernel version when available.

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

⚡ Watch Linux Kernel

Get an email when a new Linux Kernel advisory drops — max one per day, one-click unsubscribe.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43161

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-2026-43161coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for iommu/vt-d

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.

More from Microsoft Security Response Center