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FKIE_CVE-2026-80894

Vulnerability from fkie_nvd - Published: 2026-09-04 18:17 - Updated: 2026-09-04 18:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix wrong hwpt passed to iommufd_auto_response_faults on replace iommufd_hwpt_replace_device() calls: iommufd_auto_response_faults(hwpt, old_handle); passing the *new* hwpt together with the handle of the device's *old* domain. This should be a parameter mismatch: 1. Semantically, iommufd_auto_response_faults(x, handle) scans x->fault's deliver list and response xarray for groups matching "handle". A group is queued under the hwpt that was attached at fault-delivery time. old_handle is fetched *before* the domain switch, so its group lives on old->fault, not on the new hwpt->fault. 2. Historically, the first argument was "old". The routine was introduced by commit b7d8833677ba ("iommufd: Fault-capable hwpt attach/detach/replace") as __fault_domain_replace_dev() in fault.c, correctly calling iommufd_auto_response_faults(old, curr). Commit fb21b1568ada ("iommufd: Make attach_handle generic than fault specific") moved this into iommufd_hwpt_replace_device() in device.c and swapped it to "hwpt". This should be a refactor regression, not an intentional change. Fix this by passing "old" instead.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/564ac339c0f8bada4e77a57a92bab9d3df635e07
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8eb077025279304268bd58657f0af3d388822b21
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/adb87155b67f9759ff010c0a99559f5bffa45dcf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ba5c0f28a26e7d9be1e0997f8920dd638e2782fd
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommufd/device.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "adb87155b67f9759ff010c0a99559f5bffa45dcf",
              "status": "affected",
              "version": "6d11543bf37abdf60b8e6022a62fccfb82a5fe2e",
              "versionType": "git"
            },
            {
              "lessThan": "564ac339c0f8bada4e77a57a92bab9d3df635e07",
              "status": "affected",
              "version": "fb21b1568adaa76af7a8c853f37c60fba8b28661",
              "versionType": "git"
            },
            {
              "lessThan": "8eb077025279304268bd58657f0af3d388822b21",
              "status": "affected",
              "version": "fb21b1568adaa76af7a8c853f37c60fba8b28661",
              "versionType": "git"
            },
            {
              "lessThan": "ba5c0f28a26e7d9be1e0997f8920dd638e2782fd",
              "status": "affected",
              "version": "fb21b1568adaa76af7a8c853f37c60fba8b28661",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1e0216b6a58c79b5ee91c78706d5f560e4d1f56f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4b23c4b991eb90cc7bca42e9f81142feedd4bb56",
              "versionType": "git"
            },
            {
              "lessThan": "6.12.105",
              "status": "affected",
              "version": "6.12.24",
              "versionType": "semver"
            },
            {
              "lessThan": "6.14",
              "status": "affected",
              "version": "6.13.12",
              "versionType": "semver"
            },
            {
              "lessThan": "6.15",
              "status": "affected",
              "version": "6.14.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommufd/device.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.15"
            },
            {
              "lessThan": "6.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.105",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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\niommufd: Fix wrong hwpt passed to iommufd_auto_response_faults on replace\n\niommufd_hwpt_replace_device() calls:\n\n\tiommufd_auto_response_faults(hwpt, old_handle);\n\npassing the *new* hwpt together with the handle of\nthe device\u0027s *old* domain. This should be a parameter mismatch:\n\n1. Semantically, iommufd_auto_response_faults(x, handle) scans\n   x-\u003efault\u0027s deliver list and response xarray for groups matching\n   \"handle\". A group is queued under the hwpt that was attached at\n   fault-delivery time. old_handle is fetched *before* the domain switch,\n   so its group lives on old-\u003efault, not on the new hwpt-\u003efault.\n\n2. Historically, the first argument was \"old\". The routine was\n   introduced by commit b7d8833677ba (\"iommufd: Fault-capable hwpt\n   attach/detach/replace\") as __fault_domain_replace_dev() in\n   fault.c, correctly calling iommufd_auto_response_faults(old, curr).\n   Commit fb21b1568ada (\"iommufd: Make attach_handle generic than\n   fault specific\") moved this into iommufd_hwpt_replace_device() in\n   device.c and swapped it to \"hwpt\". This should be a refactor regression,\n   not an intentional change.\n\nFix this by passing \"old\" instead."
    }
  ],
  "id": "CVE-2026-80894",
  "lastModified": "2026-09-04T18:17:57.603",
  "metrics": {},
  "published": "2026-09-04T18:17:57.603",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/564ac339c0f8bada4e77a57a92bab9d3df635e07"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8eb077025279304268bd58657f0af3d388822b21"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/adb87155b67f9759ff010c0a99559f5bffa45dcf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ba5c0f28a26e7d9be1e0997f8920dd638e2782fd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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