GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

GHSA-JQ6V-47FJ-PP2P

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31
VLAI
Details

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.

Show details on source website
To clipboard 

{
  "affected": [],
  "aliases": [
    "CVE-2026-89447"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:25Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-jq6v-47fj-pp2p",
  "modified": "2026-09-11T21:31:26Z",
  "published": "2026-09-11T21:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89447"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.