CVE-2026-68329: iommu/amd: Wait for completion instead of returning early in iommu_completion_wait()

highCVSS 7CVE-2026-68329

CSIRTS triage

vendor: Linux product: Linux kernel Denial of service

What: AMD IOMMU completion wait function returns early instead of waiting for completion.
Who is affected: Systems running affected Linux kernel versions with AMD IOMMU enabled.
Urgency: High severity; can cause denial of service or system instability; not currently exploited.
Action: Apply kernel patch or update to a fixed version once released.

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
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68329

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-2026-683290.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68329	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-68329: In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Wait for comple…nvd

Recent advisories for iommu/amd

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.

criticalCVE-2026-68325: iommu/amd: Bound the early ACPI HID mapmsrc · 2026-08-11
unknownCVE-2026-68347: In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Fix IRQ unsafe …nvd · 2026-08-10
highCVE-2026-68329: In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Wait for comple…nvd · 2026-08-10
unknownCVE-2026-68325: In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Bound the early…nvd · 2026-08-10
unknownCVE-2026-64186: In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Remove latent o…nvd · 2026-07-19
unknownCVE-2026-53283: In the Linux kernel, the following vulnerability has been resolved: iommu/amd: Bounds-check de…nvd · 2026-06-26