iommu/vt-d: Tear down scalable-mode context on probe failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90241
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:20 UTC
Updated2026-09-18 18:17:50 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Tear down scalable-mode context on probe failure intel_pasid_setup_sm_context() walks a PCI device’s DMA aliases via pci_for_each_dma_alias() and programs a scalable-mode context entry for each RID. For a device with a dma_alias_mask, the callback is invoked once for the device’s own RID and once for each alias bit, all with the same pci_dev, so device_pasid_table_setup() runs for multiple RIDs. pci_for_each_dma_alias() stops at the first callback error. Therefore, a failure partway through the walk can leave context entries for already processed RIDs present and still pointing to the device’s PASID table. On this error path, intel_iommu_probe_device() currently jumps directly to intel_pasid_free_table(), which frees the PASID table without first tearing down those context entries. The IOMMU may then walk a present context entry whose PASID table pointer references freed memory. intel_iommu_release_device() already performs teardown before freeing the table. Apply the same ordering on the probe failure path. device_pasid_table_teardown() safely handles RIDs that were never programmed: iommu_context_addr() returns NULL when no context table has been allocated, and clearing the Present bit of an already non-present entry is a no-op. So unwind is safe for both the alias that failed and any aliases not yet reached.

Risk And Classification

Primary CVSS: v3.1 8.2 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001700000 probability, percentile 0.067310000 (date 2026-09-21)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.2HIGHCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED8.2HIGHCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 301f1a80487fd2f51012533792583d4425e8b8c0 25ac85a9747cd63e1d166ace7b360a2cd9479d9d git Not specified
CNA Linux Linux affected 301f1a80487fd2f51012533792583d4425e8b8c0 d0e978ced7429b516358bb4d41d337214768ae98 git Not specified
CNA Linux Linux affected 301f1a80487fd2f51012533792583d4425e8b8c0 db5daf25f754cdc20c18525adb88240ece6fdee9 git Not specified
CNA Linux Linux affected 301f1a80487fd2f51012533792583d4425e8b8c0 c509fb73a1093a15accd7d43a61645d4b520f6ac git Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/db5daf25f754cdc20c18525adb88240ece6fdee9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/25ac85a9747cd63e1d166ace7b360a2cd9479d9d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d0e978ced7429b516358bb4d41d337214768ae98 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c509fb73a1093a15accd7d43a61645d4b520f6ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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