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FKIE_CVE-2026-89451

Vulnerability from fkie_nvd - Published: 2026-09-11 20:19 - Updated: 2026-09-11 20:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/sva: Set handle->dev before the SVA handle is visible iommu_attach_device_pasid() installs the new SVA attach handle in the group PASID lookup before iommu_sva_bind_device() returns. A concurrent bind can therefore find and reuse the same handle after iommu_sva_lock is dropped. handle->dev was initialized after dropping iommu_sva_lock. This leaves a window where a racing bind can return a handle whose dev pointer is still NULL. A subsequent iommu_sva_unbind_device() can then dereference it via handle->dev->iommu_group. Initialize handle->dev before releasing iommu_sva_lock so any visible SVA handle is fully initialized.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/37a96a30617a4c96f048a5874c00509bc4fe4d85
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/530f8f9c3546cb3ebee1b135375aaee08a073ebb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/968e9a1f71140c86dc4092f6b361e997923f3813
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bcffb1c75da8fc9d51168ff9f09d471c26507912
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommu-sva.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bcffb1c75da8fc9d51168ff9f09d471c26507912",
              "status": "affected",
              "version": "be51b1d6bbff48c7d1943a8ff1e5a55777807f6e",
              "versionType": "git"
            },
            {
              "lessThan": "968e9a1f71140c86dc4092f6b361e997923f3813",
              "status": "affected",
              "version": "be51b1d6bbff48c7d1943a8ff1e5a55777807f6e",
              "versionType": "git"
            },
            {
              "lessThan": "37a96a30617a4c96f048a5874c00509bc4fe4d85",
              "status": "affected",
              "version": "be51b1d6bbff48c7d1943a8ff1e5a55777807f6e",
              "versionType": "git"
            },
            {
              "lessThan": "530f8f9c3546cb3ebee1b135375aaee08a073ebb",
              "status": "affected",
              "version": "be51b1d6bbff48c7d1943a8ff1e5a55777807f6e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/iommu-sva.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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/sva: Set handle-\u003edev before the SVA handle is visible\n\niommu_attach_device_pasid() installs the new SVA attach handle in the\ngroup PASID lookup before iommu_sva_bind_device() returns. A concurrent\nbind can therefore find and reuse the same handle after iommu_sva_lock is\ndropped.\n\nhandle-\u003edev was initialized after dropping iommu_sva_lock. This leaves a\nwindow where a racing bind can return a handle whose dev pointer is still\nNULL. A subsequent iommu_sva_unbind_device() can then dereference it via\nhandle-\u003edev-\u003eiommu_group.\n\nInitialize handle-\u003edev before releasing iommu_sva_lock so any visible SVA\nhandle is fully initialized."
    }
  ],
  "id": "CVE-2026-89451",
  "lastModified": "2026-09-11T20:19:25.727",
  "metrics": {},
  "published": "2026-09-11T20:19:25.727",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/37a96a30617a4c96f048a5874c00509bc4fe4d85"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/530f8f9c3546cb3ebee1b135375aaee08a073ebb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/968e9a1f71140c86dc4092f6b361e997923f3813"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bcffb1c75da8fc9d51168ff9f09d471c26507912"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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