FKIE_CVE-2026-90240

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-10-21 13:20
Severity
8.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Flush context cache with correct SID when tearing down aliases domain_context_clear_one() and device_pasid_table_teardown() are both invoked once per DMA alias of a device. Each function locates the context entry using the bus/devfn pair provided by the pci_for_each_dma_alias() callback, then calls intel_context_flush_no_pasid(), which constructs a device-selective context-cache invalidation from info->bus and info->devfn (that is, always the requester ID of the device itself). As a result, for every alias other than the device’s own RID, the context entry that was just cleared in memory is never invalidated in the context cache. Hardware may continue using that stale cached entry. In the scalable-mode teardown path, intel_pasid_free_table() can then free the PASID directory still referenced by that stale entry, allowing the IOMMU to walk freed memory. Fix this by passing the source ID of the entry being torn down to intel_context_flush_no_pasid(), instead of deriving it from @info.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3eb6ad14ef359e426cff14942e220de101cdbe84
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5baddf100b3be730912485648cbaae5e3a251923
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a803141597d61dc0511f7cd849625e17d042ca8a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c54e4ae971b98e8d650400137d332cee56c03f55
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/intel/iommu.c",
            "drivers/iommu/intel/iommu.h",
            "drivers/iommu/intel/pasid.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3eb6ad14ef359e426cff14942e220de101cdbe84",
              "status": "affected",
              "version": "f90584f4beb84211c4d21b319cc13f391fe9f3c2",
              "versionType": "git"
            },
            {
              "lessThan": "a803141597d61dc0511f7cd849625e17d042ca8a",
              "status": "affected",
              "version": "f90584f4beb84211c4d21b319cc13f391fe9f3c2",
              "versionType": "git"
            },
            {
              "lessThan": "5baddf100b3be730912485648cbaae5e3a251923",
              "status": "affected",
              "version": "f90584f4beb84211c4d21b319cc13f391fe9f3c2",
              "versionType": "git"
            },
            {
              "lessThan": "c54e4ae971b98e8d650400137d332cee56c03f55",
              "status": "affected",
              "version": "f90584f4beb84211c4d21b319cc13f391fe9f3c2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/intel/iommu.c",
            "drivers/iommu/intel/iommu.h",
            "drivers/iommu/intel/pasid.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.11"
            },
            {
              "lessThan": "6.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/vt-d: Flush context cache with correct SID when tearing down aliases\n\ndomain_context_clear_one() and device_pasid_table_teardown() are both\ninvoked once per DMA alias of a device. Each function locates the context\nentry using the bus/devfn pair provided by the pci_for_each_dma_alias()\ncallback, then calls intel_context_flush_no_pasid(), which constructs a\ndevice-selective context-cache invalidation from info-\u003ebus and\ninfo-\u003edevfn (that is, always the requester ID of the device itself).\n\nAs a result, for every alias other than the device\u2019s own RID, the context\nentry that was just cleared in memory is never invalidated in the context\ncache. Hardware may continue using that stale cached entry. In the\nscalable-mode teardown path, intel_pasid_free_table() can then free the\nPASID directory still referenced by that stale entry, allowing the IOMMU\nto walk freed memory.\n\nFix this by passing the source ID of the entry being torn down to\nintel_context_flush_no_pasid(), instead of deriving it from @info."
    }
  ],
  "id": "CVE-2026-90240",
  "lastModified": "2026-10-21T13:20:44.323",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.0,
        "impactScore": 6.0,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-17T17:17:19.960",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3eb6ad14ef359e426cff14942e220de101cdbe84"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5baddf100b3be730912485648cbaae5e3a251923"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a803141597d61dc0511f7cd849625e17d042ca8a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c54e4ae971b98e8d650400137d332cee56c03f55"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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