CVE-2026-64151
Linux kernel iommupt bug may allow devices to bypass IOMMU page-size checks.
Is CVE-2026-64151 being exploited?
Not confirmed. CVE-2026-64151 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.12% probability of exploitation in the next 30 days.
How severe is CVE-2026-64151?
CVE-2026-64151 is rated High. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-64151?
Yes. A fix has been recorded for CVE-2026-64151. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64151 affect?
CVE-2026-64151 affects Linux kernel (iommupt driver), Linux-based servers, Embedded Linux using iommupt, Virtualization hosts with IOMMU. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64151?
Apply kernel update containing the iommupt fix and reboot affected hosts.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Misconfigured/missing PAGE_SIZE in pgsize_bitmap can let devices bypass IOMMU protections, enabling unauthorized DMA memory access or local DoS.
Patch when possible
- affected>= dcd6a011a8d523a114af2360a8753de5bd60c139 and < 00850f41da24423587abd6124a790dd4f12bcef3
- affected>= dcd6a011a8d523a114af2360a8753de5bd60c139 and < 8ef3f77c440005c7f04229a75976bfc078364247
- affected6.19
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.