iommu/dma-iommu: Fix wrong scatterlist length assignment in P2PDMA path (CVE-2026-74277) | HOL Guard CVE

High · CVSS 8.8CVE-2026-74277

iommu/dma-iommu: Fix wrong scatterlist length assignment in P2PDMA path

Answer in brief

CVE-2026-74277 records a High severity (CVSS 8.8) vulnerability in iommu/dma-iommu: Fix wrong scatterlist length assignment in P2PDMA path. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 15, 2026Updated Aug 17, 2026Source checked Sep 29, 2026First seen by HOL Aug 15, 2026Material review Aug 17, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.8
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=a25e7962db0d79882c9d32fd2a67a02e79129c0e <8646f00ce021e49f4f05bc1d4060a0c27b25d0e1 \|\| >=a25e7962db0d79882c9d32fd2a67a02e79129c0e <db50fb87015b955a5a0c155293b2dd40d63a3b9e	8646f00ce021e49f4f05bc1d4060a0c27b25d0e1, db50fb87015b955a5a0c155293b2dd40d63a3b9e
Linux/Linuxgeneric	6.16	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 8646f00ce021e49f4f05bc1d4060a0c27b25d0e1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 15, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: iommu/dma-iommu: Fix wrong scatterlist length assignment in P2PDMA path In iommu_dma_map_sg(), when handling PCI P2PDMA cases, the DMA length of the current scatterlist segment `s` is incorrectly assigned from the head entry `sg->length` instead of the current entry `s->length`. This typo causes all P2PDMA segments in the scatterlist to inherit the length of the first segment, leading to corrupted DMA lengths for multi- segment scatterlists. Fix this by using `s->length` instead of `sg->length`.

Quoted source text, attributed separately from HOL analysis.