swiotlb: use the adjusted address for the highmem page lookup

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98254
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:14 UTC
Updated2026-10-19 10:18:26 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: swiotlb: use the adjusted address for the highmem page lookup swiotlb_bounce() reads the page frame number from the slot's recorded orig_addr, then advances orig_addr by tlb_offset to reach the address the caller asked about. The highmem branch mixes the two: the offset within the page comes from the adjusted address, the page from the value before it. Once the adjustment crosses a page boundary the pair no longer describes one location, and the whole copy lands one page below the intended one for a positive tlb_offset, one above for a negative one. DMA_FROM_DEVICE writes the device data over the wrong page and leaves the intended one stale, DMA_TO_DEVICE feeds the device from a page the mapping may not cover. Partial syncs through dma_sync_single_range_for_*() are what make tlb_offset non-zero. The branch test is picked the same way, so a slot recorded in lowmem can be adjusted into highmem and the lowmem path then hands a highmem address to phys_to_virt(). Take both from orig_addr once it is final and keep pfn in the branch that uses it. PhysHighMem() asks the question straight from the address, as dma-debug already does.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001750000 probability, percentile 0.063790000 (date 2026-10-06)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5f89468e2f060031cd89fd4287298e0eaf246bf6 6e53b4d6afbde626255805d438cabb1cac482445 git Not specified
CNA Linux Linux affected 5f89468e2f060031cd89fd4287298e0eaf246bf6 aa4709813b29db89f2307f968db5d24925dcdeb1 git Not specified
CNA Linux Linux affected 5f89468e2f060031cd89fd4287298e0eaf246bf6 0219b72f5c209732b2f03a8cc0d7240b5e428a99 git Not specified
CNA Linux Linux affected 5f89468e2f060031cd89fd4287298e0eaf246bf6 b7d7914a9ae3097e63d113007e4fb44d33d515b1 git Not specified
CNA Linux Linux affected e6108147dd91b94d1979b110f265710c254c99d5 git Not specified
CNA Linux Linux affected e77b796eb9b7ca3c1c0d574d0c155f55b59ca8d5 git Not specified
CNA Linux Linux affected 5.10.47 5.11 semver Not specified
CNA Linux Linux affected 5.12.14 5.13 semver Not specified
CNA Linux Linux affected 5.13 Not specified
CNA Linux Linux unaffected 5.13 semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6e53b4d6afbde626255805d438cabb1cac482445 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/aa4709813b29db89f2307f968db5d24925dcdeb1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b7d7914a9ae3097e63d113007e4fb44d33d515b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0219b72f5c209732b2f03a8cc0d7240b5e428a99 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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