CVE-2026-74277
Linux kernel IOMMU P2PDMA bug causes incorrect DMA lengths and corrupted DMA transfers
Is CVE-2026-74277 being exploited?
Not confirmed. CVE-2026-74277 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 0.15% probability of exploitation in the next 30 days.
How severe is CVE-2026-74277?
CVE-2026-74277 is rated High with a CVSS score of 8.8. 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-2026-74277?
Yes. A fix has been recorded for CVE-2026-74277. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-74277 affect?
CVE-2026-74277 affects Linux kernel (iommu/dma-iommu P2PDMA path), Systems using PCI peer-to-peer DMA (GPUs, NVMe, RDMA), Hosts using PCI passthrough / device passthrough (virtualized environments). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-74277?
Apply kernel security update; if unable, disable or restrict PCI P2P DMA/passthrough until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Incorrect scatterlist lengths for PCI P2PDMA can cause device-initiated memory corruption, data leakage, or local privilege escalation via malformed DMA transfers.
Patch when possible
- affected>= a25e7962db0d79882c9d32fd2a67a02e79129c0e and < 8646f00ce021e49f4f05bc1d4060a0c27b25d0e1
- affected>= a25e7962db0d79882c9d32fd2a67a02e79129c0e and < db50fb87015b955a5a0c155293b2dd40d63a3b9e
- affected6.16
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.