CVE-2026-74277

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxa25e7962db0d79882c9d32fd2a67a02e79129c0e < 8646f00ce021e49f4f05bc1d4060a0c27b25d0e1affected
LinuxLinuxa25e7962db0d79882c9d32fd2a67a02e79129c0e < db50fb87015b955a5a0c155293b2dd40d63a3b9eaffected
LinuxLinux6.16affected
LinuxLinux0 < 6.16unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References