CVE-2026-89447

Status: ReceivedUnscored—

In the Linux kernel, the following vulnerability has been resolved:

iommufd: Avoid locking internal accesses during unmap

iommufd_access_notify_unmap() skips internal accesses because they do not have an external unmap callback to invoke.

However, the current test calls iommufd_lock_obj() before checking whether the access is internal. If iommufd_lock_obj() succeeds, the loop then sees the internal access and continues, bypassing the matching iommufd_put_object() used by the normal unmap path. This leaks the object reference taken by iommufd_lock_obj().

Check for internal accesses first so skipped entries are never locked.

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.22%
Percentile among all scored CVEs: 11
Score date: 10/4/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux Kernel^AI

References

Raw JSON (NVD)

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{
  "id": "CVE-2026-89447",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0",
              "lessThan": "436189ee4bb2c7c993b945d68570dd38c3e4349e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0",
              "lessThan": "50a66a63d1c841ae6b28a4551f642c1bba4c9529",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0",
              "lessThan": "0dbcdf4473a614adbd732d567c9b39ac0e040e0c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/iommu/iommufd/device.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/iommu/iommufd/device.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-11T20:19:25.227",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Avoid locking internal accesses during unmap\n\niommufd_access_notify_unmap() skips internal accesses because they do\nnot have an external unmap callback to invoke.\n\nHowever, the current test calls iommufd_lock_obj() before checking\nwhether the access is internal. If iommufd_lock_obj() succeeds, the loop\nthen sees the internal access and continues, bypassing the matching\niommufd_put_object() used by the normal unmap path. This leaks the\nobject reference taken by iommufd_lock_obj().\n\nCheck for internal accesses first so skipped entries are never locked."
    }
  ],
  "lastModified": "2026-09-11T20:19:25.227",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}