High 8.8Published Aug 15, 2026

CVE-2026-74277iommu/dma-iommu: Fix wrong scatterlist length assignment in P2PDMA path

Updated under an hour ago (2026-10-19 07:20 UTC)

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Exploited in the last 30 days

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`.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a25e7962db0d79882c9d32fd2a67a02e79129c0e before 6166cb1344f16dd403f2192f4bea6f6654f1ae1e; from a25e7962db0d79882c9d32fd2a67a02e79129c0e before 8646f00ce021e49f4f05bc1d4060a0c27b25d0e1; from a25e7962db0d79882c9d32fd2a67a02e79129c0e before db50fb87015b955a5a0c155293b2dd40d63a3b9e	CNA record

References

https://git.kernel.org/stable/c/6166cb1344f16dd403f2192f4bea6f6654f1ae1e
https://git.kernel.org/stable/c/8646f00ce021e49f4f05bc1d4060a0c27b25d0e1
https://git.kernel.org/stable/c/db50fb87015b955a5a0c155293b2dd40d63a3b9e

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.